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-INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:33:05,690 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:33:05,692 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:33:05,706 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:33:05,706 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:33:05,707 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:33:05,708 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:33:05,710 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:33:05,712 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:33:05,713 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:33:05,714 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:33:05,714 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:33:05,715 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:33:05,716 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:33:05,717 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:33:05,718 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:33:05,719 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:33:05,721 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:33:05,723 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:33:05,725 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:33:05,726 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:33:05,728 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:33:05,730 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-27 15:33:05,740 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:33:05,764 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:33:05,764 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:33:05,766 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:33:05,767 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:33:05,767 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:33:05,767 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:33:05,767 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:33:05,767 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:33:05,768 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:33:05,768 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:33:05,768 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:33:05,768 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:33:05,769 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:33:05,769 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:33:05,769 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:33:05,770 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:33:05,770 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:33:05,770 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:33:05,770 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:33:05,770 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:33:05,771 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:33:05,771 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:33:05,771 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:33:05,771 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:33:05,771 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:33:05,771 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:33:05,772 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:33:05,772 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:33:05,772 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:33:05,772 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:33:05,772 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:33:05,773 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:33:05,773 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:33:05,773 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:33:05,827 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:33:05,841 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:33:05,846 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:33:05,848 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:33:05,849 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:33:05,849 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-27 15:33:05,920 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/45b98f35b/d874e92fe2f44fbb9b591fe5cb6c3091/FLAGa8185cd2a [2018-10-27 15:33:06,356 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:33:06,357 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-10-27 15:33:06,367 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/45b98f35b/d874e92fe2f44fbb9b591fe5cb6c3091/FLAGa8185cd2a [2018-10-27 15:33:06,380 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/45b98f35b/d874e92fe2f44fbb9b591fe5cb6c3091 [2018-10-27 15:33:06,392 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:33:06,393 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:33:06,394 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:33:06,394 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:33:06,398 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:33:06,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,403 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b98b391 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06, skipping insertion in model container [2018-10-27 15:33:06,403 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,414 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:33:06,436 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:33:06,659 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:33:06,663 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:33:06,680 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:33:06,697 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:33:06,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06 WrapperNode [2018-10-27 15:33:06,698 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:33:06,699 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:33:06,699 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:33:06,699 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:33:06,708 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,713 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,718 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:33:06,719 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:33:06,719 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:33:06,719 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:33:06,728 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,729 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,729 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (1/1) ... [2018-10-27 15:33:06,740 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:33:06,741 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:33:06,741 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:33:06,741 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:33:06,742 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (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 [2018-10-27 15:33:06,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:33:06,803 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:33:06,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:33:06,803 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:33:06,803 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:33:06,803 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:33:06,804 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:33:06,804 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:33:07,060 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:33:07,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:33:07 BoogieIcfgContainer [2018-10-27 15:33:07,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:33:07,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:33:07,062 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:33:07,067 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:33:07,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:33:06" (1/3) ... [2018-10-27 15:33:07,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15c45253 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:33:07, skipping insertion in model container [2018-10-27 15:33:07,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:06" (2/3) ... [2018-10-27 15:33:07,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15c45253 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:33:07, skipping insertion in model container [2018-10-27 15:33:07,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:33:07" (3/3) ... [2018-10-27 15:33:07,071 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-10-27 15:33:07,083 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:33:07,096 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:33:07,111 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:33:07,147 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:33:07,148 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:33:07,148 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:33:07,148 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:33:07,148 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:33:07,148 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:33:07,149 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:33:07,149 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:33:07,168 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-10-27 15:33:07,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 15:33:07,174 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:07,175 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:07,178 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:07,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:07,184 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-27 15:33:07,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:07,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:07,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:07,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:07,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:07,290 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:33:07,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:33:07,290 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:33:07,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:33:07,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:33:07,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:33:07,309 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-10-27 15:33:07,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:07,331 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-27 15:33:07,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:33:07,332 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 15:33:07,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:07,341 INFO L225 Difference]: With dead ends: 30 [2018-10-27 15:33:07,342 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 15:33:07,346 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 [2018-10-27 15:33:07,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 15:33:07,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 15:33:07,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 15:33:07,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-10-27 15:33:07,388 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-10-27 15:33:07,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:07,389 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-10-27 15:33:07,389 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:33:07,389 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-10-27 15:33:07,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 15:33:07,390 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:07,390 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:07,391 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:07,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:07,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-10-27 15:33:07,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:07,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:07,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,393 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:07,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:07,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:07,571 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:33:07,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:33:07,571 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:33:07,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:33:07,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:33:07,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:33:07,577 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-10-27 15:33:07,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:07,749 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-10-27 15:33:07,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:33:07,750 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 15:33:07,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:07,751 INFO L225 Difference]: With dead ends: 24 [2018-10-27 15:33:07,751 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 15:33:07,753 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 [2018-10-27 15:33:07,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 15:33:07,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 15:33:07,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 15:33:07,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-10-27 15:33:07,768 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-10-27 15:33:07,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:07,768 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-10-27 15:33:07,769 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:33:07,769 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-10-27 15:33:07,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 15:33:07,770 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:07,770 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:07,774 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:07,774 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:07,775 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-10-27 15:33:07,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:07,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:07,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:07,777 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:07,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:07,935 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:07,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:07,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:07,937 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 15:33:07,939 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 15:33:07,974 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:33:07,974 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:33:08,070 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 15:33:08,439 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:33:08,440 INFO L272 AbstractInterpreter]: Visited 13 different actions 69 times. Merged at 4 different actions 30 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-27 15:33:08,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:08,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:33:08,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:08,488 INFO L194 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 [2018-10-27 15:33:08,505 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:08,506 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:08,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:08,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:08,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:08,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:08,804 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:08,836 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:08,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 15:33:08,837 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:08,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 15:33:08,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 15:33:08,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:33:08,840 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-10-27 15:33:08,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:08,950 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-27 15:33:08,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 15:33:08,951 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 15:33:08,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:08,952 INFO L225 Difference]: With dead ends: 27 [2018-10-27 15:33:08,952 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 15:33:08,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:33:08,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 15:33:08,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-27 15:33:08,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-27 15:33:08,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-27 15:33:08,958 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-27 15:33:08,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:08,958 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-27 15:33:08,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 15:33:08,958 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-27 15:33:08,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 15:33:08,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:08,959 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:08,960 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:08,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:08,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-10-27 15:33:08,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:08,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:08,962 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:08,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:08,962 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:08,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:09,185 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:09,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:09,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:09,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:09,187 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:09,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:09,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:09,206 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:09,206 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:09,218 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 15:33:09,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:09,222 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:09,259 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 15:33:09,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:09,310 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-27 15:33:09,334 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 15:33:09,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2018-10-27 15:33:09,335 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:33:09,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:33:09,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:33:09,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-27 15:33:09,336 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-10-27 15:33:09,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:09,366 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-10-27 15:33:09,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:33:09,367 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-10-27 15:33:09,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:09,369 INFO L225 Difference]: With dead ends: 27 [2018-10-27 15:33:09,369 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 15:33:09,370 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-27 15:33:09,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 15:33:09,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 15:33:09,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 15:33:09,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-27 15:33:09,376 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-10-27 15:33:09,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:09,376 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-27 15:33:09,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:33:09,377 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-27 15:33:09,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 15:33:09,378 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:09,378 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:09,380 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:09,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:09,380 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-10-27 15:33:09,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:09,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:09,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:09,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:09,381 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:09,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:09,550 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:09,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:09,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:09,551 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-10-27 15:33:09,552 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-27 15:33:09,553 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:33:09,553 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:33:09,557 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 15:33:09,916 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:33:09,916 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 4 times. Found 9 fixpoints after 2 different actions. Largest state had 2 variables. [2018-10-27 15:33:09,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:09,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:33:09,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:09,955 INFO L194 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 [2018-10-27 15:33:09,988 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:09,989 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:10,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:10,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:10,173 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:10,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:10,773 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:10,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:10,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-10-27 15:33:10,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:10,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:33:10,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:33:10,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:33:10,811 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-10-27 15:33:10,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:10,895 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 15:33:10,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:33:10,895 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-27 15:33:10,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:10,896 INFO L225 Difference]: With dead ends: 34 [2018-10-27 15:33:10,896 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 15:33:10,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:33:10,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 15:33:10,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 15:33:10,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 15:33:10,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-27 15:33:10,904 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-10-27 15:33:10,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:10,904 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-27 15:33:10,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:33:10,904 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-27 15:33:10,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 15:33:10,905 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:10,905 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:10,906 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:10,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:10,906 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-10-27 15:33:10,906 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:10,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:10,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:10,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:10,908 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:10,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:11,121 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:11,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:11,121 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:11,122 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:11,122 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:11,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:11,122 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:11,138 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:11,139 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:11,187 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:33:11,187 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:11,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:11,312 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 15:33:11,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-27 15:33:11,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:11,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 11 [2018-10-27 15:33:11,569 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:11,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:33:11,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:33:11,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-10-27 15:33:11,573 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-10-27 15:33:12,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:12,044 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2018-10-27 15:33:12,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:33:12,046 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 15:33:12,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:12,047 INFO L225 Difference]: With dead ends: 44 [2018-10-27 15:33:12,047 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 15:33:12,048 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:33:12,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 15:33:12,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-27 15:33:12,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 15:33:12,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-27 15:33:12,053 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-10-27 15:33:12,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:12,054 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-27 15:33:12,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:33:12,054 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-27 15:33:12,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 15:33:12,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:12,055 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:12,055 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:12,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:12,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-10-27 15:33:12,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:12,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:12,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:12,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:12,057 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:12,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:12,376 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:12,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:12,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:12,378 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:12,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:12,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:12,379 INFO L194 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 [2018-10-27 15:33:12,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:12,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:12,405 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:12,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:12,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:12,460 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:33:12,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:12,758 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:33:12,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:12,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-10-27 15:33:12,787 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:12,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:33:12,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:33:12,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:33:12,789 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2018-10-27 15:33:12,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:12,943 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-27 15:33:12,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:33:12,943 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-27 15:33:12,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:12,944 INFO L225 Difference]: With dead ends: 46 [2018-10-27 15:33:12,944 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 15:33:12,945 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:33:12,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 15:33:12,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-27 15:33:12,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-27 15:33:12,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-27 15:33:12,951 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-10-27 15:33:12,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:12,951 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-27 15:33:12,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:33:12,951 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-27 15:33:12,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 15:33:12,952 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:12,953 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:12,953 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:12,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:12,953 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-10-27 15:33:12,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:12,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:12,954 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:12,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:12,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:12,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:13,460 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:13,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:13,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:13,461 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:13,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:13,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:13,461 INFO L194 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 [2018-10-27 15:33:13,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:13,469 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:13,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:13,483 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:13,568 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:33:13,568 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:13,831 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:33:13,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:13,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-10-27 15:33:13,851 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:13,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 15:33:13,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 15:33:13,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:33:13,853 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2018-10-27 15:33:13,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:13,974 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-27 15:33:13,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:33:13,979 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-27 15:33:13,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:13,980 INFO L225 Difference]: With dead ends: 49 [2018-10-27 15:33:13,980 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 15:33:13,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:33:13,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 15:33:13,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 15:33:13,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 15:33:13,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-10-27 15:33:13,988 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-10-27 15:33:13,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:13,989 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-10-27 15:33:13,989 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 15:33:13,989 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-10-27 15:33:13,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 15:33:13,990 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:13,990 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:13,991 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:13,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:13,991 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-10-27 15:33:13,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:13,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:13,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:13,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:13,992 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:14,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:14,266 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:14,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:14,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:14,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:14,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:14,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:14,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:14,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:14,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:14,288 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 15:33:14,288 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:14,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:14,386 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 15:33:14,387 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:14,517 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-27 15:33:14,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:14,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 17 [2018-10-27 15:33:14,538 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:14,539 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:33:14,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:33:14,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:33:14,540 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2018-10-27 15:33:20,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:20,252 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-10-27 15:33:20,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:33:20,253 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-10-27 15:33:20,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:20,254 INFO L225 Difference]: With dead ends: 62 [2018-10-27 15:33:20,254 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 15:33:20,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2018-10-27 15:33:20,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 15:33:20,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2018-10-27 15:33:20,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 15:33:20,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-10-27 15:33:20,262 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2018-10-27 15:33:20,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:20,262 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-10-27 15:33:20,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:33:20,262 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-10-27 15:33:20,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 15:33:20,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:20,264 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:20,264 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:20,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:20,264 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-10-27 15:33:20,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:20,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:20,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:20,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:20,266 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:20,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:21,008 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:21,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:21,009 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:21,009 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:21,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:21,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:21,010 INFO L194 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 [2018-10-27 15:33:21,023 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:21,024 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:21,041 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:21,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:21,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:21,080 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:21,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:21,613 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:21,634 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:21,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-10-27 15:33:21,635 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:21,635 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:33:21,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:33:21,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:33:21,638 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2018-10-27 15:33:21,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:21,858 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-10-27 15:33:21,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:33:21,859 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-27 15:33:21,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:21,863 INFO L225 Difference]: With dead ends: 61 [2018-10-27 15:33:21,863 INFO L226 Difference]: Without dead ends: 45 [2018-10-27 15:33:21,864 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:33:21,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-27 15:33:21,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-10-27 15:33:21,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 15:33:21,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-10-27 15:33:21,870 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-10-27 15:33:21,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:21,871 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-10-27 15:33:21,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:33:21,871 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-10-27 15:33:21,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 15:33:21,872 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:21,872 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:21,872 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:21,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:21,873 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-10-27 15:33:21,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:21,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:21,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:21,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:21,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:21,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:22,363 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:22,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:22,363 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:22,363 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:22,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:22,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:22,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:22,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:22,372 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:22,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:22,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:22,415 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 15:33:22,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:22,917 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 15:33:22,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:22,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-10-27 15:33:22,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:22,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:33:22,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:33:22,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:33:22,941 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 14 states. [2018-10-27 15:33:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:23,202 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2018-10-27 15:33:23,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:33:23,209 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-27 15:33:23,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:23,210 INFO L225 Difference]: With dead ends: 64 [2018-10-27 15:33:23,210 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 15:33:23,211 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:33:23,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 15:33:23,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 15:33:23,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 15:33:23,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-10-27 15:33:23,223 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2018-10-27 15:33:23,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:23,223 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-10-27 15:33:23,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:33:23,223 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-10-27 15:33:23,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 15:33:23,227 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:23,228 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:23,228 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:23,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:23,228 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-10-27 15:33:23,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:23,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:23,229 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:23,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:23,230 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:23,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:23,536 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:23,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:23,537 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:23,537 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:23,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:23,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:23,537 INFO L194 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 [2018-10-27 15:33:23,547 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:23,547 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:23,562 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 15:33:23,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:23,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:23,845 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 15:33:23,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:24,527 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-10-27 15:33:24,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:24,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 23 [2018-10-27 15:33:24,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:24,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 15:33:24,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 15:33:24,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2018-10-27 15:33:24,557 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 19 states. [2018-10-27 15:33:27,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:27,743 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2018-10-27 15:33:27,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 15:33:27,743 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-10-27 15:33:27,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:27,744 INFO L225 Difference]: With dead ends: 77 [2018-10-27 15:33:27,744 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 15:33:27,745 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=213, Invalid=489, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:33:27,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 15:33:27,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 54. [2018-10-27 15:33:27,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 15:33:27,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-10-27 15:33:27,752 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2018-10-27 15:33:27,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:27,753 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-10-27 15:33:27,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 15:33:27,753 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-10-27 15:33:27,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 15:33:27,754 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:27,754 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:27,754 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:27,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:27,755 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-10-27 15:33:27,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:27,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:27,756 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:27,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:27,756 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:27,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:28,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:28,098 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:28,098 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:28,098 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:28,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:28,099 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:28,106 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:28,107 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:28,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:28,121 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:28,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:28,188 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 15:33:28,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:29,559 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 15:33:29,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:29,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-10-27 15:33:29,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:29,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:33:29,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:33:29,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:33:29,582 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 17 states. [2018-10-27 15:33:29,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:29,882 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-10-27 15:33:29,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:33:29,883 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-27 15:33:29,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:29,884 INFO L225 Difference]: With dead ends: 76 [2018-10-27 15:33:29,885 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 15:33:29,885 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:33:29,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 15:33:29,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-27 15:33:29,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 15:33:29,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-10-27 15:33:29,893 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-10-27 15:33:29,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:29,893 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-10-27 15:33:29,893 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:33:29,893 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-10-27 15:33:29,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 15:33:29,894 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:29,894 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:29,895 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:29,895 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:29,895 INFO L82 PathProgramCache]: Analyzing trace with hash 786973339, now seen corresponding path program 10 times [2018-10-27 15:33:29,895 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:29,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:29,896 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:29,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:29,896 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:29,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:30,295 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:30,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:30,296 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:30,296 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:30,296 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:30,296 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:30,296 INFO L194 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 [2018-10-27 15:33:30,304 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:30,304 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:30,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:30,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:30,415 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 15:33:30,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:31,245 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 15:33:31,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:31,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 15] total 31 [2018-10-27 15:33:31,266 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:31,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:33:31,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:33:31,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:33:31,267 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 18 states. [2018-10-27 15:33:31,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:31,668 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-10-27 15:33:31,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:33:31,669 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-27 15:33:31,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:31,670 INFO L225 Difference]: With dead ends: 79 [2018-10-27 15:33:31,671 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 15:33:31,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 98 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:33:31,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 15:33:31,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-27 15:33:31,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 15:33:31,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-10-27 15:33:31,680 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2018-10-27 15:33:31,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:31,681 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-10-27 15:33:31,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:33:31,681 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-10-27 15:33:31,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 15:33:31,682 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:31,682 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:31,683 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:31,683 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:31,683 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 11 times [2018-10-27 15:33:31,683 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:31,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:31,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:31,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:31,685 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:31,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:32,016 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:32,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:32,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:32,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:32,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:32,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:32,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:32,027 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:32,027 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:32,085 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 15:33:32,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:32,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:32,332 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-27 15:33:32,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:32,553 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-10-27 15:33:32,575 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:32,575 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 7, 7] total 29 [2018-10-27 15:33:32,575 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:32,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:33:32,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:33:32,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=587, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:33:32,577 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 24 states. [2018-10-27 15:33:36,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:36,863 INFO L93 Difference]: Finished difference Result 92 states and 106 transitions. [2018-10-27 15:33:36,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:33:36,863 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-27 15:33:36,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:36,864 INFO L225 Difference]: With dead ends: 92 [2018-10-27 15:33:36,864 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 15:33:36,865 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=327, Invalid=795, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 15:33:36,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 15:33:36,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2018-10-27 15:33:36,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 15:33:36,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-10-27 15:33:36,875 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 59 [2018-10-27 15:33:36,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:36,876 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-10-27 15:33:36,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:33:36,876 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-10-27 15:33:36,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 15:33:36,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:36,877 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:36,877 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:36,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:36,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1319222592, now seen corresponding path program 12 times [2018-10-27 15:33:36,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:36,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:36,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:36,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:36,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:36,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:37,365 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:37,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:37,366 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:37,366 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:37,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:37,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:37,366 INFO L194 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 [2018-10-27 15:33:37,379 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:37,379 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:37,412 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:37,412 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:37,415 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:37,830 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:33:37,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:39,264 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:33:39,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:39,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 17] total 36 [2018-10-27 15:33:39,286 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:39,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:33:39,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:33:39,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 15:33:39,288 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 21 states. [2018-10-27 15:33:39,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:39,788 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2018-10-27 15:33:39,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:33:39,789 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-27 15:33:39,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:39,790 INFO L225 Difference]: With dead ends: 91 [2018-10-27 15:33:39,790 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 15:33:39,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 15:33:39,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 15:33:39,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-27 15:33:39,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 15:33:39,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-10-27 15:33:39,799 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-10-27 15:33:39,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:39,799 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-10-27 15:33:39,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:33:39,800 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-10-27 15:33:39,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 15:33:39,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:39,800 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:39,801 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:39,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:39,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1618626467, now seen corresponding path program 13 times [2018-10-27 15:33:39,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:39,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:39,802 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:39,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:39,802 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:39,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:40,258 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:40,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:40,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:40,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:40,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:40,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:40,259 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:40,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:40,268 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:40,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:40,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:40,386 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:33:40,387 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:41,736 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 15:33:41,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:41,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 18] total 38 [2018-10-27 15:33:41,759 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:41,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:33:41,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:33:41,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 15:33:41,760 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 22 states. [2018-10-27 15:33:42,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:42,727 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2018-10-27 15:33:42,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:33:42,727 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-27 15:33:42,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:42,729 INFO L225 Difference]: With dead ends: 94 [2018-10-27 15:33:42,729 INFO L226 Difference]: Without dead ends: 72 [2018-10-27 15:33:42,730 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 15:33:42,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-27 15:33:42,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-27 15:33:42,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 15:33:42,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-10-27 15:33:42,738 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 68 [2018-10-27 15:33:42,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:42,739 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-10-27 15:33:42,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:33:42,739 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-10-27 15:33:42,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 15:33:42,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:42,740 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:42,740 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:42,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:42,740 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 14 times [2018-10-27 15:33:42,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:42,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:42,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:42,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:42,742 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:42,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:43,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:43,167 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:43,167 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:43,167 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:43,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:43,167 INFO L194 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 [2018-10-27 15:33:43,175 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:43,175 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:43,214 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 15:33:43,214 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:43,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:43,468 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 15:33:43,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:43,812 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-10-27 15:33:43,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:43,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8, 8] total 35 [2018-10-27 15:33:43,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:43,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 15:33:43,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 15:33:43,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=871, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:33:43,834 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 29 states. [2018-10-27 15:33:51,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:51,026 INFO L93 Difference]: Finished difference Result 107 states and 123 transitions. [2018-10-27 15:33:51,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:33:51,027 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 71 [2018-10-27 15:33:51,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:51,027 INFO L225 Difference]: With dead ends: 107 [2018-10-27 15:33:51,027 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 15:33:51,028 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=465, Invalid=1175, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:33:51,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 15:33:51,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 78. [2018-10-27 15:33:51,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 15:33:51,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2018-10-27 15:33:51,037 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 71 [2018-10-27 15:33:51,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:51,037 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2018-10-27 15:33:51,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 15:33:51,037 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2018-10-27 15:33:51,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-27 15:33:51,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:51,038 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:51,038 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:51,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:51,039 INFO L82 PathProgramCache]: Analyzing trace with hash 2099613118, now seen corresponding path program 15 times [2018-10-27 15:33:51,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:51,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:51,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:51,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:51,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:51,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:51,708 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:51,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:51,708 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:51,708 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:51,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:51,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:51,709 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:51,716 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:51,717 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:51,762 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:51,762 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:51,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:51,843 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 15:33:51,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:55,013 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 15:33:55,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:55,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 23] total 46 [2018-10-27 15:33:55,034 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:55,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 15:33:55,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 15:33:55,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 15:33:55,036 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 25 states. [2018-10-27 15:33:55,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:55,590 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2018-10-27 15:33:55,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:33:55,591 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-27 15:33:55,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:55,592 INFO L225 Difference]: With dead ends: 109 [2018-10-27 15:33:55,592 INFO L226 Difference]: Without dead ends: 84 [2018-10-27 15:33:55,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 15:33:55,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-27 15:33:55,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-10-27 15:33:55,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 15:33:55,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-10-27 15:33:55,602 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-10-27 15:33:55,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:55,602 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-10-27 15:33:55,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 15:33:55,602 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-10-27 15:33:55,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-27 15:33:55,603 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:55,603 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:55,603 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:55,604 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:55,604 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-10-27 15:33:55,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:55,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:55,605 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:55,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:55,605 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:55,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:56,695 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:56,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:56,696 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:56,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:56,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:56,696 INFO L194 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 [2018-10-27 15:33:56,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:56,709 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:56,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:56,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:56,793 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 15:33:56,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:59,033 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-27 15:33:59,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:59,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22] total 47 [2018-10-27 15:33:59,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:59,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 15:33:59,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 15:33:59,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 15:33:59,056 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-10-27 15:33:59,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:59,812 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-10-27 15:33:59,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:33:59,812 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-27 15:33:59,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:59,813 INFO L225 Difference]: With dead ends: 115 [2018-10-27 15:33:59,813 INFO L226 Difference]: Without dead ends: 90 [2018-10-27 15:33:59,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 15:33:59,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-27 15:33:59,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-10-27 15:33:59,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 15:33:59,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-10-27 15:33:59,823 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-10-27 15:33:59,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:59,823 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-10-27 15:33:59,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 15:33:59,824 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-10-27 15:33:59,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 15:33:59,825 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:59,825 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:59,825 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:59,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:59,825 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-10-27 15:33:59,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:59,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:59,826 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:59,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:59,827 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:59,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:00,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:00,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:00,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:00,895 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:00,895 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:00,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:00,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:00,903 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:00,903 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:00,973 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 15:34:00,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:00,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:01,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-27 15:34:01,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:02,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-10-27 15:34:02,056 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:02,056 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 9, 9] total 43 [2018-10-27 15:34:02,056 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:02,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 15:34:02,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 15:34:02,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:34:02,057 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 36 states. [2018-10-27 15:34:06,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:06,504 INFO L93 Difference]: Finished difference Result 128 states and 146 transitions. [2018-10-27 15:34:06,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:34:06,504 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-10-27 15:34:06,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:06,505 INFO L225 Difference]: With dead ends: 128 [2018-10-27 15:34:06,505 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 15:34:06,506 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=690, Invalid=1760, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 15:34:06,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 15:34:06,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-10-27 15:34:06,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 15:34:06,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2018-10-27 15:34:06,512 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 89 [2018-10-27 15:34:06,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:06,512 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2018-10-27 15:34:06,513 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 15:34:06,513 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2018-10-27 15:34:06,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-27 15:34:06,513 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:06,514 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:06,514 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:06,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:06,514 INFO L82 PathProgramCache]: Analyzing trace with hash -2002812611, now seen corresponding path program 18 times [2018-10-27 15:34:06,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:06,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:06,515 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:06,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:06,516 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:06,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:07,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 140 proven. 1134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:34:07,623 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:07,624 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:07,624 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:07,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:07,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:07,624 INFO L194 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 [2018-10-27 15:34:07,632 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:07,633 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:07,660 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:07,660 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:07,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:07,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 15:34:07,722 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:10,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 15:34:10,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:10,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 26] total 55 [2018-10-27 15:34:10,562 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:10,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 15:34:10,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 15:34:10,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:34:10,563 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand 31 states. [2018-10-27 15:34:11,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:11,647 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2018-10-27 15:34:11,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:34:11,651 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 98 [2018-10-27 15:34:11,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:11,653 INFO L225 Difference]: With dead ends: 133 [2018-10-27 15:34:11,653 INFO L226 Difference]: Without dead ends: 105 [2018-10-27 15:34:11,654 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:34:11,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-27 15:34:11,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-10-27 15:34:11,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-27 15:34:11,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2018-10-27 15:34:11,665 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 98 [2018-10-27 15:34:11,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:11,665 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2018-10-27 15:34:11,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 15:34:11,666 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2018-10-27 15:34:11,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 15:34:11,666 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:11,667 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:11,667 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:11,667 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:11,667 INFO L82 PathProgramCache]: Analyzing trace with hash 615751261, now seen corresponding path program 19 times [2018-10-27 15:34:11,667 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:11,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:11,668 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:11,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:11,668 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:11,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:12,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 150 proven. 1305 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:34:12,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:12,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:12,650 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:12,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:12,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:12,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:12,657 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:12,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:12,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:12,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:12,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 15:34:12,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:16,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 15:34:16,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:16,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 27, 28] total 59 [2018-10-27 15:34:16,298 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:16,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 15:34:16,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 15:34:16,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:34:16,300 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand 33 states. [2018-10-27 15:34:17,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:17,381 INFO L93 Difference]: Finished difference Result 139 states and 155 transitions. [2018-10-27 15:34:17,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 15:34:17,381 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-10-27 15:34:17,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:17,383 INFO L225 Difference]: With dead ends: 139 [2018-10-27 15:34:17,383 INFO L226 Difference]: Without dead ends: 111 [2018-10-27 15:34:17,385 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 181 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:34:17,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-27 15:34:17,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-10-27 15:34:17,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-27 15:34:17,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2018-10-27 15:34:17,397 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 104 [2018-10-27 15:34:17,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:17,397 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2018-10-27 15:34:17,398 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 15:34:17,398 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2018-10-27 15:34:17,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-27 15:34:17,398 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:17,399 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:17,399 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:17,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:17,399 INFO L82 PathProgramCache]: Analyzing trace with hash 323314557, now seen corresponding path program 20 times [2018-10-27 15:34:17,399 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:17,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:17,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:17,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:17,400 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:17,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:18,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 160 proven. 1488 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 15:34:18,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:18,458 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:18,458 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:18,458 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:18,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:18,459 INFO L194 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 [2018-10-27 15:34:18,467 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:18,467 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:44,228 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 15:34:44,228 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:45,115 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:45,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-27 15:34:45,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:46,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-10-27 15:34:46,324 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:46,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 10, 10] total 51 [2018-10-27 15:34:46,325 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:46,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 15:34:46,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 15:34:46,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 15:34:46,327 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand 43 states. [2018-10-27 15:35:07,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:07,391 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2018-10-27 15:35:07,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 15:35:07,391 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 110 [2018-10-27 15:35:07,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:07,392 INFO L225 Difference]: With dead ends: 152 [2018-10-27 15:35:07,392 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 15:35:07,394 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=939, Invalid=2483, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:35:07,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 15:35:07,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-10-27 15:35:07,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-27 15:35:07,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 128 transitions. [2018-10-27 15:35:07,406 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 128 transitions. Word has length 110 [2018-10-27 15:35:07,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:07,406 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 128 transitions. [2018-10-27 15:35:07,406 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 15:35:07,406 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 128 transitions. [2018-10-27 15:35:07,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-27 15:35:07,407 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:07,407 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:07,407 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:07,407 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:07,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1376389474, now seen corresponding path program 21 times [2018-10-27 15:35:07,408 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:07,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:07,409 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:07,409 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:07,409 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:07,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:08,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:08,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:08,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:08,493 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:08,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:08,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:08,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:08,501 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:35:08,501 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:35:08,536 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:35:08,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:08,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:08,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:35:08,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:13,990 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 667 proven. 1218 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:35:14,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:14,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 31, 32] total 69 [2018-10-27 15:35:14,012 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:14,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:35:14,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:35:14,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:35:14,014 INFO L87 Difference]: Start difference. First operand 120 states and 128 transitions. Second operand 39 states. [2018-10-27 15:35:15,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:15,491 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-10-27 15:35:15,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 15:35:15,491 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-27 15:35:15,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:15,493 INFO L225 Difference]: With dead ends: 154 [2018-10-27 15:35:15,493 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 15:35:15,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1246, Invalid=3446, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:35:15,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 15:35:15,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2018-10-27 15:35:15,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-27 15:35:15,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2018-10-27 15:35:15,505 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 119 [2018-10-27 15:35:15,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:15,505 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2018-10-27 15:35:15,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:35:15,506 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2018-10-27 15:35:15,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-27 15:35:15,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:15,507 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:15,507 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:15,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:15,507 INFO L82 PathProgramCache]: Analyzing trace with hash -57936773, now seen corresponding path program 22 times [2018-10-27 15:35:15,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:15,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:15,508 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:15,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:15,508 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:15,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:16,625 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:16,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:16,625 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:16,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:16,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:16,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:16,626 INFO L194 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 [2018-10-27 15:35:16,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:16,635 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:35:16,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:16,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:16,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:35:16,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:21,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 690 proven. 1305 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 15:35:21,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:21,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 32, 33] total 71 [2018-10-27 15:35:21,613 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:21,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 15:35:21,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 15:35:21,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1318, Invalid=3652, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 15:35:21,616 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand 40 states. [2018-10-27 15:35:23,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:23,182 INFO L93 Difference]: Finished difference Result 157 states and 174 transitions. [2018-10-27 15:35:23,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:35:23,182 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-27 15:35:23,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:23,184 INFO L225 Difference]: With dead ends: 157 [2018-10-27 15:35:23,184 INFO L226 Difference]: Without dead ends: 126 [2018-10-27 15:35:23,185 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 212 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1318, Invalid=3652, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 15:35:23,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-27 15:35:23,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-10-27 15:35:23,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-27 15:35:23,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 134 transitions. [2018-10-27 15:35:23,198 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 134 transitions. Word has length 122 [2018-10-27 15:35:23,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:23,199 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 134 transitions. [2018-10-27 15:35:23,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 15:35:23,199 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 134 transitions. [2018-10-27 15:35:23,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 15:35:23,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:23,200 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 30, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:23,200 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:23,200 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:23,200 INFO L82 PathProgramCache]: Analyzing trace with hash 490556798, now seen corresponding path program 23 times [2018-10-27 15:35:23,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:23,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:23,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:23,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:23,201 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:23,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:24,505 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:24,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:24,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:24,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:24,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:24,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:24,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:24,513 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:35:24,513 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:36:32,799 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 15:36:32,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:36:33,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:36:33,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 780 proven. 100 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 15:36:33,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:36:34,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 780 proven. 100 refuted. 0 times theorem prover too weak. 1305 trivial. 0 not checked. [2018-10-27 15:36:34,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:36:34,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 11, 11] total 59 [2018-10-27 15:36:34,606 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:36:34,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 15:36:34,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 15:36:34,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=817, Invalid=2605, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:36:34,607 INFO L87 Difference]: Start difference. First operand 126 states and 134 transitions. Second operand 50 states. [2018-10-27 15:37:01,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:01,290 INFO L93 Difference]: Finished difference Result 170 states and 192 transitions. [2018-10-27 15:37:01,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 15:37:01,291 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 125 [2018-10-27 15:37:01,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:01,292 INFO L225 Difference]: With dead ends: 170 [2018-10-27 15:37:01,292 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 15:37:01,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 240 SyntacticMatches, 5 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=1197, Invalid=3359, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 15:37:01,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 15:37:01,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 132. [2018-10-27 15:37:01,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-27 15:37:01,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 141 transitions. [2018-10-27 15:37:01,304 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 141 transitions. Word has length 125 [2018-10-27 15:37:01,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:01,304 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 141 transitions. [2018-10-27 15:37:01,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 15:37:01,305 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 141 transitions. [2018-10-27 15:37:01,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-27 15:37:01,305 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:01,305 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:01,306 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:01,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:01,306 INFO L82 PathProgramCache]: Analyzing trace with hash -2039378720, now seen corresponding path program 24 times [2018-10-27 15:37:01,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:01,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:01,307 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:37:01,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:01,307 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:01,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:02,358 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:02,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:02,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:02,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:02,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:02,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:02,358 INFO L194 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 [2018-10-27 15:37:02,366 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:37:02,366 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:37:02,402 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:37:02,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:37:02,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:02,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 15:37:02,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:08,253 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 832 proven. 1488 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 15:37:08,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:08,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 34, 35] total 76 [2018-10-27 15:37:08,274 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:08,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 15:37:08,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 15:37:08,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 15:37:08,275 INFO L87 Difference]: Start difference. First operand 132 states and 141 transitions. Second operand 43 states. [2018-10-27 15:37:10,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:10,213 INFO L93 Difference]: Finished difference Result 169 states and 188 transitions. [2018-10-27 15:37:10,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 15:37:10,213 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-27 15:37:10,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:10,215 INFO L225 Difference]: With dead ends: 169 [2018-10-27 15:37:10,215 INFO L226 Difference]: Without dead ends: 135 [2018-10-27 15:37:10,216 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1503, Invalid=4197, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 15:37:10,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-27 15:37:10,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2018-10-27 15:37:10,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-27 15:37:10,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 144 transitions. [2018-10-27 15:37:10,230 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 144 transitions. Word has length 131 [2018-10-27 15:37:10,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:10,230 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 144 transitions. [2018-10-27 15:37:10,230 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 15:37:10,231 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 144 transitions. [2018-10-27 15:37:10,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 15:37:10,231 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:10,231 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:10,231 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:10,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:10,232 INFO L82 PathProgramCache]: Analyzing trace with hash 34645821, now seen corresponding path program 25 times [2018-10-27 15:37:10,232 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:10,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:10,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:37:10,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:10,232 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:10,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:11,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:11,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:11,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:11,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:11,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:11,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:11,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:11,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:11,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:37:11,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:11,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:37:11,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 15:37:11,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:37:17,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 858 proven. 1584 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-10-27 15:37:17,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:37:17,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 35, 36] total 78 [2018-10-27 15:37:17,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:37:17,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 15:37:17,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 15:37:17,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 15:37:17,808 INFO L87 Difference]: Start difference. First operand 135 states and 144 transitions. Second operand 44 states. [2018-10-27 15:37:19,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:19,834 INFO L93 Difference]: Finished difference Result 172 states and 191 transitions. [2018-10-27 15:37:19,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 15:37:19,834 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-27 15:37:19,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:19,835 INFO L225 Difference]: With dead ends: 172 [2018-10-27 15:37:19,835 INFO L226 Difference]: Without dead ends: 138 [2018-10-27 15:37:19,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1582, Invalid=4424, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 15:37:19,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-27 15:37:19,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-10-27 15:37:19,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 15:37:19,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 147 transitions. [2018-10-27 15:37:19,847 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 147 transitions. Word has length 134 [2018-10-27 15:37:19,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:19,847 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 147 transitions. [2018-10-27 15:37:19,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 15:37:19,848 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 147 transitions. [2018-10-27 15:37:19,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 15:37:19,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:19,848 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:19,849 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:19,849 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:19,849 INFO L82 PathProgramCache]: Analyzing trace with hash -99773504, now seen corresponding path program 26 times [2018-10-27 15:37:19,849 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:19,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:19,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:19,850 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:19,850 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:19,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:21,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:21,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:21,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:21,189 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:21,189 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:21,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:21,189 INFO L194 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 [2018-10-27 15:37:21,196 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:37:21,197 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown