java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:14:23,695 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:14:23,697 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:14:23,709 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:14:23,709 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:14:23,710 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:14:23,712 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:14:23,713 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:14:23,715 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:14:23,716 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:14:23,717 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:14:23,717 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:14:23,718 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:14:23,719 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:14:23,720 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:14:23,721 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:14:23,722 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:14:23,723 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:14:23,725 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:14:23,727 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:14:23,728 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:14:23,729 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:14:23,732 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 12:14:23,740 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:14:23,755 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:14:23,756 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:14:23,757 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:14:23,757 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:14:23,757 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:14:23,757 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:14:23,757 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:14:23,758 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:14:23,758 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:14:23,758 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:14:23,758 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:14:23,758 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:14:23,759 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:14:23,759 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:14:23,759 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:14:23,760 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:14:23,760 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:14:23,760 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:14:23,760 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:14:23,760 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:14:23,761 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:14:23,761 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:14:23,761 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:14:23,761 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:14:23,761 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:14:23,762 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:14:23,762 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:14:23,762 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:14:23,762 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:14:23,762 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:14:23,762 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:14:23,763 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:14:23,763 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:14:23,763 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:14:23,806 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:14:23,819 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:14:23,823 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:14:23,824 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:14:23,824 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:14:23,825 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i [2018-10-24 12:14:23,882 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/edd070d22/9fa5e6c78f804a14ad254ad82b29ac9e/FLAGb8500b47b [2018-10-24 12:14:24,275 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:14:24,275 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i [2018-10-24 12:14:24,282 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/edd070d22/9fa5e6c78f804a14ad254ad82b29ac9e/FLAGb8500b47b [2018-10-24 12:14:24,295 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/edd070d22/9fa5e6c78f804a14ad254ad82b29ac9e [2018-10-24 12:14:24,306 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:14:24,308 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:14:24,309 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:14:24,309 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:14:24,316 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:14:24,317 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,320 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71cd0907 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24, skipping insertion in model container [2018-10-24 12:14:24,320 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,331 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:14:24,360 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:14:24,567 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:14:24,571 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:14:24,593 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:14:24,617 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:14:24,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24 WrapperNode [2018-10-24 12:14:24,618 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:14:24,619 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:14:24,619 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:14:24,619 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:14:24,629 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,641 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,664 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:14:24,664 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:14:24,664 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:14:24,664 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:14:24,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,680 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,685 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,686 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (1/1) ... [2018-10-24 12:14:24,688 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:14:24,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:14:24,689 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:14:24,689 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:14:24,690 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (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 [2018-10-24 12:14:24,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:14:24,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:14:24,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:14:24,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:14:24,827 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:14:24,827 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:14:24,827 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:14:24,827 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:14:25,159 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:14:25,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:14:25 BoogieIcfgContainer [2018-10-24 12:14:25,160 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:14:25,161 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:14:25,161 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:14:25,164 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:14:25,165 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:14:24" (1/3) ... [2018-10-24 12:14:25,165 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12319d6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:14:25, skipping insertion in model container [2018-10-24 12:14:25,166 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:14:24" (2/3) ... [2018-10-24 12:14:25,166 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12319d6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:14:25, skipping insertion in model container [2018-10-24 12:14:25,166 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:14:25" (3/3) ... [2018-10-24 12:14:25,168 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call2_true-termination.i [2018-10-24 12:14:25,177 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:14:25,185 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:14:25,203 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:14:25,237 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:14:25,238 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:14:25,238 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:14:25,238 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:14:25,238 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:14:25,238 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:14:25,239 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:14:25,239 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:14:25,258 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2018-10-24 12:14:25,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:14:25,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:25,266 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:25,268 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:25,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:25,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1193744236, now seen corresponding path program 1 times [2018-10-24 12:14:25,277 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:25,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:25,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:25,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:25,334 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:25,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:25,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:25,420 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:14:25,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:14:25,421 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:14:25,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:14:25,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:14:25,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:14:25,443 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2018-10-24 12:14:25,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:25,465 INFO L93 Difference]: Finished difference Result 43 states and 50 transitions. [2018-10-24 12:14:25,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:14:25,467 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-24 12:14:25,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:25,476 INFO L225 Difference]: With dead ends: 43 [2018-10-24 12:14:25,476 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:14:25,480 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 [2018-10-24 12:14:25,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:14:25,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-24 12:14:25,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:14:25,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-24 12:14:25,522 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 14 [2018-10-24 12:14:25,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:25,522 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-24 12:14:25,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:14:25,523 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-24 12:14:25,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:14:25,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:25,524 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:25,524 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:25,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:25,524 INFO L82 PathProgramCache]: Analyzing trace with hash 1255135895, now seen corresponding path program 1 times [2018-10-24 12:14:25,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:25,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:25,526 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:25,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:25,526 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:25,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:25,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:25,648 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:14:25,648 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:14:25,649 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:14:25,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:14:25,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:14:25,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:14:25,651 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 3 states. [2018-10-24 12:14:25,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:25,826 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2018-10-24 12:14:25,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:14:25,828 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-24 12:14:25,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:25,831 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:14:25,832 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:14:25,833 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:14:25,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:14:25,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2018-10-24 12:14:25,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:14:25,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-24 12:14:25,851 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 15 [2018-10-24 12:14:25,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:25,851 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-24 12:14:25,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:14:25,851 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-24 12:14:25,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:14:25,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:25,852 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:25,854 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:25,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:25,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1812131568, now seen corresponding path program 1 times [2018-10-24 12:14:25,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:25,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:25,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:25,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:25,856 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:25,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:26,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:26,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:26,049 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:26,050 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-24 12:14:26,052 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [39], [42], [44], [50], [51], [52], [54] [2018-10-24 12:14:26,098 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:14:26,098 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:14:26,264 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:14:27,553 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:14:27,554 INFO L272 AbstractInterpreter]: Visited 17 different actions 165 times. Merged at 4 different actions 118 times. Widened at 1 different actions 26 times. Found 29 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-24 12:14:27,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:27,617 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:14:27,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:27,618 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 [2018-10-24 12:14:27,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:27,638 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:27,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:27,701 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:27,842 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 8 [2018-10-24 12:14:27,862 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-10-24 12:14:27,862 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:27,891 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:27,961 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:27,962 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:17, output treesize:9 [2018-10-24 12:14:28,249 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2018-10-24 12:14:28,276 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:14:28,278 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2018-10-24 12:14:28,278 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:28,345 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:28,424 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:28,424 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:26, output treesize:9 [2018-10-24 12:14:28,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:28,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:29,257 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2018-10-24 12:14:29,342 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-10-24 12:14:29,352 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:29,414 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:29,455 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:14:29,456 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:26, output treesize:15 [2018-10-24 12:14:30,670 WARN L179 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:14:30,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:30,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:30,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 14 [2018-10-24 12:14:30,707 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:30,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:14:30,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:14:30,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:14:30,708 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 9 states. [2018-10-24 12:14:31,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:31,384 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2018-10-24 12:14:31,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:14:31,385 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-24 12:14:31,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:31,387 INFO L225 Difference]: With dead ends: 53 [2018-10-24 12:14:31,387 INFO L226 Difference]: Without dead ends: 41 [2018-10-24 12:14:31,387 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:14:31,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-24 12:14:31,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2018-10-24 12:14:31,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:14:31,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-10-24 12:14:31,397 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 18 [2018-10-24 12:14:31,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:31,397 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-10-24 12:14:31,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:14:31,397 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-10-24 12:14:31,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 12:14:31,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:31,399 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:31,399 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:31,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:31,400 INFO L82 PathProgramCache]: Analyzing trace with hash 602547482, now seen corresponding path program 1 times [2018-10-24 12:14:31,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:31,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:31,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:31,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:31,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:31,712 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-24 12:14:31,712 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:31,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:31,713 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-24 12:14:31,713 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [29], [31], [33], [39], [42], [44], [47], [49], [50], [51], [52], [54], [55] [2018-10-24 12:14:31,716 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:14:31,716 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:14:31,730 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:14:33,133 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:14:33,133 INFO L272 AbstractInterpreter]: Visited 22 different actions 500 times. Merged at 9 different actions 268 times. Widened at 2 different actions 52 times. Found 30 fixpoints after 3 different actions. Largest state had 32 variables. [2018-10-24 12:14:33,170 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:33,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:14:33,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:33,171 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 [2018-10-24 12:14:33,186 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:33,187 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:33,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:33,236 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:33,407 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-24 12:14:33,422 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-24 12:14:33,423 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:33,449 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:33,622 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:14:33,622 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:48, output treesize:41 [2018-10-24 12:14:34,915 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2018-10-24 12:14:34,935 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:14:34,936 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2018-10-24 12:14:34,937 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:38,028 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:38,091 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:14:38,092 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:57, output treesize:34 [2018-10-24 12:14:40,217 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:40,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:46,593 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 16 [2018-10-24 12:14:47,362 WARN L179 SmtUtils]: Spent 556.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 30 [2018-10-24 12:14:49,492 WARN L179 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 32 [2018-10-24 12:14:49,571 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2018-10-24 12:14:49,611 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2018-10-24 12:14:49,613 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:14:49,617 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:14:49,658 INFO L267 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:14:49,658 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:28, output treesize:15 [2018-10-24 12:14:50,873 WARN L179 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 11 [2018-10-24 12:14:52,185 WARN L179 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 13 [2018-10-24 12:14:52,195 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:14:52,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:52,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 13, 13] total 25 [2018-10-24 12:14:52,218 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:52,218 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:14:52,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:14:52,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=513, Unknown=4, NotChecked=0, Total=600 [2018-10-24 12:14:52,220 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 14 states. [2018-10-24 12:15:03,990 WARN L179 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 37 [2018-10-24 12:15:06,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:06,685 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2018-10-24 12:15:06,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:15:06,686 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2018-10-24 12:15:06,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:06,687 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:15:06,687 INFO L226 Difference]: Without dead ends: 53 [2018-10-24 12:15:06,688 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=130, Invalid=736, Unknown=4, NotChecked=0, Total=870 [2018-10-24 12:15:06,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-10-24 12:15:06,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 45. [2018-10-24 12:15:06,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:15:06,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-10-24 12:15:06,699 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 30 [2018-10-24 12:15:06,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:06,699 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-10-24 12:15:06,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:15:06,700 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-10-24 12:15:06,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:15:06,701 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:06,701 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:06,701 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:06,702 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:06,702 INFO L82 PathProgramCache]: Analyzing trace with hash -1500033328, now seen corresponding path program 2 times [2018-10-24 12:15:06,702 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:06,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:06,703 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:15:06,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:06,704 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:06,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:07,441 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:07,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:07,442 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:07,442 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:07,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:07,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:07,442 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 [2018-10-24 12:15:07,451 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:15:07,451 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:15:09,137 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:15:09,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:09,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:09,545 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-24 12:15:09,554 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-24 12:15:09,554 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:15:09,557 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:09,572 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:09,573 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:48, output treesize:41 [2018-10-24 12:15:10,175 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-10-24 12:15:10,185 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-10-24 12:15:10,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:10,945 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 25 [2018-10-24 12:15:15,458 WARN L179 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 58 DAG size of output: 32 [2018-10-24 12:15:16,852 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2018-10-24 12:15:17,339 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2018-10-24 12:15:17,357 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2018-10-24 12:15:17,358 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:15:17,360 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:17,367 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:15:17,368 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:36, output treesize:16 [2018-10-24 12:15:17,945 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:15:17,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:15:17,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 17] total 24 [2018-10-24 12:15:17,967 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:15:17,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:15:17,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:15:17,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=457, Unknown=1, NotChecked=0, Total=552 [2018-10-24 12:15:17,968 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 9 states. [2018-10-24 12:15:18,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:15:18,654 INFO L93 Difference]: Finished difference Result 89 states and 93 transitions. [2018-10-24 12:15:18,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:15:18,655 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2018-10-24 12:15:18,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:15:18,656 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:15:18,657 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:15:18,658 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=94, Invalid=457, Unknown=1, NotChecked=0, Total=552 [2018-10-24 12:15:18,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:15:18,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 48. [2018-10-24 12:15:18,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:15:18,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-10-24 12:15:18,669 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 42 [2018-10-24 12:15:18,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:15:18,669 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-10-24 12:15:18,669 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:15:18,669 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-10-24 12:15:18,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:15:18,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:15:18,671 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:15:18,671 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:15:18,671 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:15:18,672 INFO L82 PathProgramCache]: Analyzing trace with hash -207301449, now seen corresponding path program 3 times [2018-10-24 12:15:18,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:15:18,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:18,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:15:18,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:15:18,673 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:15:18,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:15:21,037 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 23 refuted. 3 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:15:21,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:21,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:15:21,038 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:15:21,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:15:21,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:15:21,038 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 [2018-10-24 12:15:21,047 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:15:21,047 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:15:21,086 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:15:21,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:15:21,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:15:21,185 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-24 12:15:21,188 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-24 12:15:21,189 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:15:21,191 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:21,213 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:15:21,213 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2018-10-24 12:15:21,883 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2018-10-24 12:15:21,903 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 38 [2018-10-24 12:15:21,904 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-24 12:15:21,926 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:24,002 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 3 dim-0 vars, and 1 xjuncts. [2018-10-24 12:15:24,003 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:66, output treesize:59 [2018-10-24 12:15:24,930 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2018-10-24 12:15:25,178 WARN L179 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2018-10-24 12:15:30,845 WARN L179 SmtUtils]: Spent 2.34 s on a formula simplification. DAG size of input: 77 DAG size of output: 42 [2018-10-24 12:15:31,552 WARN L179 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2018-10-24 12:15:33,707 WARN L179 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-10-24 12:15:36,190 WARN L179 SmtUtils]: Spent 2.14 s on a formula simplification that was a NOOP. DAG size: 71 [2018-10-24 12:15:36,260 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 68 [2018-10-24 12:15:36,273 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:15:36,286 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 64 treesize of output 72 [2018-10-24 12:15:36,287 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-24 12:15:36,681 INFO L303 Elim1Store]: Index analysis took 290 ms [2018-10-24 12:15:36,689 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 47 [2018-10-24 12:15:36,692 INFO L267 ElimStorePlain]: Start of recursive call 4: 3 dim-0 vars, End of recursive call: 3 dim-0 vars, and 2 xjuncts. [2018-10-24 12:15:36,710 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 57 [2018-10-24 12:15:36,713 INFO L267 ElimStorePlain]: Start of recursive call 5: 3 dim-0 vars, End of recursive call: 3 dim-0 vars, and 2 xjuncts. [2018-10-24 12:15:36,896 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:15:36,990 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 9 case distinctions, treesize of input 60 treesize of output 128 [2018-10-24 12:15:36,991 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2018-10-24 12:15:37,023 INFO L267 ElimStorePlain]: Start of recursive call 6: 34 dim-0 vars, End of recursive call: 34 dim-0 vars, and 64 xjuncts. [2018-10-24 12:15:40,286 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: 38 dim-0 vars, and 27 xjuncts. [2018-10-24 12:15:41,971 INFO L267 ElimStorePlain]: Start of recursive call 1: 10 dim-0 vars, 1 dim-2 vars, End of recursive call: 8 dim-0 vars, and 4 xjuncts. [2018-10-24 12:15:41,971 INFO L202 ElimStorePlain]: Needed 6 recursive calls to eliminate 11 variables, input treesize:133, output treesize:157 [2018-10-24 12:15:43,248 WARN L179 SmtUtils]: Spent 460.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 23 [2018-10-24 12:15:43,698 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 3 proven. 41 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:15:43,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:15:45,248 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-10-24 12:15:47,350 WARN L179 SmtUtils]: Spent 1.39 s on a formula simplification. DAG size of input: 41 DAG size of output: 30 [2018-10-24 12:15:48,879 WARN L179 SmtUtils]: Spent 893.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2018-10-24 12:15:59,684 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2018-10-24 12:15:59,688 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 25 [2018-10-24 12:15:59,711 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:15:59,714 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 17 [2018-10-24 12:15:59,715 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 12:15:59,734 WARN L307 Elim1Store]: Array PQE input equivalent to true [2018-10-24 12:15:59,735 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-24 12:15:59,839 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:59,853 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:15:59,872 INFO L267 ElimStorePlain]: Start of recursive call 1: 6 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2018-10-24 12:15:59,872 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 7 variables, input treesize:48, output treesize:20 [2018-10-24 12:16:02,287 WARN L179 SmtUtils]: Spent 310.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:16:03,591 WARN L179 SmtUtils]: Spent 761.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:16:06,092 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:16:06,114 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:16:06,114 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 18, 16] total 35 [2018-10-24 12:16:06,114 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:16:06,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:16:06,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:16:06,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1049, Unknown=5, NotChecked=0, Total=1190 [2018-10-24 12:16:06,116 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 21 states. [2018-10-24 12:16:15,415 WARN L179 SmtUtils]: Spent 368.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-10-24 12:16:18,936 WARN L179 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 35 [2018-10-24 12:16:20,924 WARN L179 SmtUtils]: Spent 598.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2018-10-24 12:16:23,393 WARN L179 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 45 [2018-10-24 12:16:27,665 WARN L179 SmtUtils]: Spent 776.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2018-10-24 12:16:29,111 WARN L179 SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2018-10-24 12:16:31,272 WARN L179 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 79 DAG size of output: 42 [2018-10-24 12:16:40,168 WARN L179 SmtUtils]: Spent 2.27 s on a formula simplification. DAG size of input: 78 DAG size of output: 41 [2018-10-24 12:16:47,214 WARN L179 SmtUtils]: Spent 6.81 s on a formula simplification. DAG size of input: 94 DAG size of output: 57 [2018-10-24 12:16:55,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:16:55,811 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2018-10-24 12:16:55,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:16:55,812 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 45 [2018-10-24 12:16:55,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:16:55,813 INFO L225 Difference]: With dead ends: 106 [2018-10-24 12:16:55,813 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:16:55,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 64.4s TimeCoverageRelationStatistics Valid=252, Invalid=1812, Unknown=6, NotChecked=0, Total=2070 [2018-10-24 12:16:55,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:16:55,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 60. [2018-10-24 12:16:55,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:16:55,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-10-24 12:16:55,830 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 45 [2018-10-24 12:16:55,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:16:55,830 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-10-24 12:16:55,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:16:55,830 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-10-24 12:16:55,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:16:55,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:16:55,832 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:16:55,832 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:16:55,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:16:55,833 INFO L82 PathProgramCache]: Analyzing trace with hash -597350463, now seen corresponding path program 4 times [2018-10-24 12:16:55,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:16:55,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:55,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:16:55,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:16:55,834 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:16:55,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:58,651 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 6 proven. 40 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-10-24 12:16:58,651 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:58,652 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:16:58,652 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:16:58,652 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:16:58,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:16:58,652 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 [2018-10-24 12:16:58,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:16:58,661 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:16:58,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:16:58,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:16:59,524 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 14 [2018-10-24 12:16:59,543 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2018-10-24 12:16:59,543 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-10-24 12:16:59,553 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:16:59,568 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-10-24 12:16:59,569 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2018-10-24 12:17:00,497 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2018-10-24 12:17:00,518 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 38 [2018-10-24 12:17:00,519 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-24 12:17:00,533 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:17:00,635 INFO L267 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 3 dim-0 vars, and 1 xjuncts. [2018-10-24 12:17:00,635 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 5 variables, input treesize:66, output treesize:59 [2018-10-24 12:17:01,909 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2018-10-24 12:17:02,618 WARN L179 SmtUtils]: Spent 645.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2018-10-24 12:17:07,367 WARN L179 SmtUtils]: Spent 2.80 s on a formula simplification. DAG size of input: 77 DAG size of output: 72 [2018-10-24 12:17:09,780 WARN L179 SmtUtils]: Spent 2.23 s on a formula simplification that was a NOOP. DAG size: 72 [2018-10-24 12:17:12,401 WARN L179 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2018-10-24 12:17:15,848 WARN L179 SmtUtils]: Spent 2.38 s on a formula simplification that was a NOOP. DAG size: 71 [2018-10-24 12:17:15,909 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 68 [2018-10-24 12:17:15,928 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 68 [2018-10-24 12:17:15,930 INFO L267 ElimStorePlain]: Start of recursive call 3: 3 dim-0 vars, End of recursive call: 3 dim-0 vars, and 2 xjuncts. [2018-10-24 12:17:16,023 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:17:16,040 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 62 [2018-10-24 12:17:16,042 INFO L267 ElimStorePlain]: Start of recursive call 4: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-24 12:17:16,073 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:17:16,142 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 64 treesize of output 72 [2018-10-24 12:17:16,144 INFO L267 ElimStorePlain]: Start of recursive call 5: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2018-10-24 12:17:16,503 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:17:16,543 INFO L303 Elim1Store]: Index analysis took 226 ms [2018-10-24 12:17:16,607 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 9 case distinctions, treesize of input 60 treesize of output 128 [2018-10-24 12:17:16,608 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2018-10-24 12:17:16,628 INFO L267 ElimStorePlain]: Start of recursive call 6: 34 dim-0 vars, End of recursive call: 34 dim-0 vars, and 64 xjuncts. [2018-10-24 12:17:21,649 INFO L267 ElimStorePlain]: Start of recursive call 2: 3 dim-1 vars, End of recursive call: 38 dim-0 vars, and 27 xjuncts. [2018-10-24 12:17:23,516 INFO L267 ElimStorePlain]: Start of recursive call 1: 10 dim-0 vars, 1 dim-2 vars, End of recursive call: 14 dim-0 vars, and 8 xjuncts. [2018-10-24 12:17:23,517 INFO L202 ElimStorePlain]: Needed 6 recursive calls to eliminate 11 variables, input treesize:133, output treesize:299 [2018-10-24 12:17:24,251 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 23 [2018-10-24 12:17:24,999 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 3 proven. 73 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:17:24,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:17:26,927 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-10-24 12:17:26,931 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 16 [2018-10-24 12:17:29,621 WARN L179 SmtUtils]: Spent 1.72 s on a formula simplification. DAG size of input: 56 DAG size of output: 30 [2018-10-24 12:17:31,285 WARN L179 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 32 [2018-10-24 12:17:44,212 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2018-10-24 12:17:44,219 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2018-10-24 12:17:44,222 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 25 [2018-10-24 12:17:44,242 INFO L682 Elim1Store]: detected equality via solver [2018-10-24 12:17:44,245 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 17 [2018-10-24 12:17:44,246 INFO L267 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2018-10-24 12:17:44,249 WARN L307 Elim1Store]: Array PQE input equivalent to true [2018-10-24 12:17:44,249 INFO L267 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2018-10-24 12:17:44,258 INFO L267 ElimStorePlain]: Start of recursive call 3: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:17:44,263 INFO L267 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2018-10-24 12:17:44,279 INFO L267 ElimStorePlain]: Start of recursive call 1: 6 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2018-10-24 12:17:44,280 INFO L202 ElimStorePlain]: Needed 5 recursive calls to eliminate 7 variables, input treesize:48, output treesize:20 [2018-10-24 12:17:45,159 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-24 12:17:48,286 WARN L179 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:17:48,879 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:17:49,750 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 8 proven. 68 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:17:49,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:17:49,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 19, 18] total 39 [2018-10-24 12:17:49,784 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:17:49,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:17:49,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:17:49,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1325, Unknown=6, NotChecked=0, Total=1482 [2018-10-24 12:17:49,787 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 23 states. [2018-10-24 12:17:59,164 WARN L179 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-10-24 12:18:03,781 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2018-10-24 12:18:07,097 WARN L179 SmtUtils]: Spent 416.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2018-10-24 12:18:10,674 WARN L179 SmtUtils]: Spent 863.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2018-10-24 12:18:21,302 WARN L179 SmtUtils]: Spent 4.29 s on a formula simplification that was a NOOP. DAG size: 87 [2018-10-24 12:18:22,019 WARN L179 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 40 [2018-10-24 12:18:22,631 WARN L179 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2018-10-24 12:18:25,355 WARN L179 SmtUtils]: Spent 2.13 s on a formula simplification that was a NOOP. DAG size: 55 [2018-10-24 12:18:29,857 WARN L179 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2018-10-24 12:18:33,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:33,601 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2018-10-24 12:18:33,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:18:33,603 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 57 [2018-10-24 12:18:33,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:33,604 INFO L225 Difference]: With dead ends: 122 [2018-10-24 12:18:33,604 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:18:33,606 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 67.0s TimeCoverageRelationStatistics Valid=245, Invalid=2099, Unknown=8, NotChecked=0, Total=2352 [2018-10-24 12:18:33,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:18:33,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 72. [2018-10-24 12:18:33,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:18:33,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-10-24 12:18:33,622 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 57 [2018-10-24 12:18:33,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:33,622 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-10-24 12:18:33,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:18:33,622 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-10-24 12:18:33,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:18:33,624 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:33,624 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:33,625 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:33,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:33,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1336655223, now seen corresponding path program 5 times [2018-10-24 12:18:33,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:33,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:33,626 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:33,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:33,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:33,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:36,589 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 8 proven. 54 refuted. 3 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:18:36,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:36,589 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:36,589 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:36,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:36,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:36,590 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 [2018-10-24 12:18:36,597 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:36,597 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