/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/loop-lit/gr2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 00:34:44,654 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 00:34:44,657 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 00:34:44,675 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 00:34:44,675 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 00:34:44,677 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 00:34:44,679 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 00:34:44,680 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 00:34:44,693 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 00:34:44,694 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 00:34:44,695 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 00:34:44,697 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 00:34:44,698 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 00:34:44,700 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 00:34:44,702 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 00:34:44,703 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 00:34:44,704 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 00:34:44,707 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 00:34:44,709 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 00:34:44,714 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 00:34:44,717 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 00:34:44,720 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 00:34:44,721 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 00:34:44,722 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 00:34:44,727 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 00:34:44,741 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 00:34:44,742 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 00:34:44,743 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 00:34:44,743 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 00:34:44,757 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 00:34:44,758 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 00:34:44,759 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 00:34:44,759 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 00:34:44,759 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 00:34:44,760 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 00:34:44,760 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 00:34:44,760 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 00:34:44,760 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 00:34:44,760 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 00:34:44,761 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 00:34:44,761 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 00:34:44,761 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 00:34:44,761 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 00:34:44,762 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 00:34:44,762 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 00:34:44,762 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 00:34:44,762 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 00:34:44,763 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 00:34:44,763 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 00:34:44,763 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 00:34:44,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 00:34:44,763 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 00:34:44,764 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 00:34:44,764 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 00:34:44,764 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 00:34:44,764 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 00:34:44,765 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 00:34:44,765 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-11-07 00:34:45,092 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 00:34:45,112 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 00:34:45,116 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 00:34:45,117 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 00:34:45,118 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 00:34:45,119 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006.i [2019-11-07 00:34:45,188 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87bf61a73/1e74e748dded430b9b3cd6206a37e82d/FLAGdadea7a55 [2019-11-07 00:34:45,575 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 00:34:45,575 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006.i [2019-11-07 00:34:45,582 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87bf61a73/1e74e748dded430b9b3cd6206a37e82d/FLAGdadea7a55 [2019-11-07 00:34:45,974 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/87bf61a73/1e74e748dded430b9b3cd6206a37e82d [2019-11-07 00:34:45,989 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 00:34:45,996 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 00:34:46,008 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 00:34:46,009 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 00:34:46,013 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 00:34:46,018 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:34:45" (1/1) ... [2019-11-07 00:34:46,026 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5121d482 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46, skipping insertion in model container [2019-11-07 00:34:46,026 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:34:45" (1/1) ... [2019-11-07 00:34:46,043 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 00:34:46,083 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 00:34:46,244 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:34:46,248 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 00:34:46,261 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:34:46,273 INFO L192 MainTranslator]: Completed translation [2019-11-07 00:34:46,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46 WrapperNode [2019-11-07 00:34:46,274 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 00:34:46,275 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 00:34:46,275 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 00:34:46,275 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 00:34:46,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,291 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,291 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,384 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,389 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,390 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... [2019-11-07 00:34:46,392 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 00:34:46,392 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 00:34:46,393 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 00:34:46,393 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 00:34:46,394 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2019-11-07 00:34:46,447 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 00:34:46,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 00:34:46,449 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 00:34:46,449 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 00:34:46,449 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 00:34:46,449 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 00:34:46,449 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 00:34:46,450 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 00:34:46,450 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 00:34:46,451 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 00:34:46,451 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 00:34:46,634 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 00:34:46,634 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 00:34:46,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:34:46 BoogieIcfgContainer [2019-11-07 00:34:46,636 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 00:34:46,637 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 00:34:46,637 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 00:34:46,640 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 00:34:46,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:34:45" (1/3) ... [2019-11-07 00:34:46,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c50eaf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:34:46, skipping insertion in model container [2019-11-07 00:34:46,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:34:46" (2/3) ... [2019-11-07 00:34:46,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c50eaf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:34:46, skipping insertion in model container [2019-11-07 00:34:46,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:34:46" (3/3) ... [2019-11-07 00:34:46,644 INFO L109 eAbstractionObserver]: Analyzing ICFG gr2006.i [2019-11-07 00:34:46,655 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 00:34:46,663 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 00:34:46,675 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 00:34:46,700 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 00:34:46,700 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 00:34:46,700 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 00:34:46,700 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 00:34:46,700 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 00:34:46,701 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 00:34:46,701 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 00:34:46,701 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 00:34:46,723 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-11-07 00:34:46,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 00:34:46,728 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:46,729 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:46,731 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:46,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:46,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1001202113, now seen corresponding path program 1 times [2019-11-07 00:34:46,744 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:46,744 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30249012] [2019-11-07 00:34:46,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:46,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:46,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:34:46,845 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30249012] [2019-11-07 00:34:46,846 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:34:46,847 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 00:34:46,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603578174] [2019-11-07 00:34:46,854 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 00:34:46,856 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:46,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 00:34:46,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 00:34:46,874 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2019-11-07 00:34:46,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:46,898 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-11-07 00:34:46,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 00:34:46,899 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-07 00:34:46,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:46,910 INFO L225 Difference]: With dead ends: 32 [2019-11-07 00:34:46,910 INFO L226 Difference]: Without dead ends: 13 [2019-11-07 00:34:46,917 INFO L630 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 [2019-11-07 00:34:46,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-11-07 00:34:46,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-11-07 00:34:46,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-07 00:34:46,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-11-07 00:34:46,967 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-11-07 00:34:46,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:46,967 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-11-07 00:34:46,968 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 00:34:46,969 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-11-07 00:34:46,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 00:34:46,971 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:46,971 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:46,971 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:46,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:46,973 INFO L82 PathProgramCache]: Analyzing trace with hash 563077882, now seen corresponding path program 1 times [2019-11-07 00:34:46,973 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:46,974 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763312093] [2019-11-07 00:34:46,974 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:47,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:47,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:34:47,069 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763312093] [2019-11-07 00:34:47,070 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:34:47,070 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 00:34:47,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145219104] [2019-11-07 00:34:47,072 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 00:34:47,072 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:47,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 00:34:47,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 00:34:47,073 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2019-11-07 00:34:47,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:47,151 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-11-07 00:34:47,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 00:34:47,154 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-07 00:34:47,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:47,156 INFO L225 Difference]: With dead ends: 22 [2019-11-07 00:34:47,156 INFO L226 Difference]: Without dead ends: 17 [2019-11-07 00:34:47,160 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 00:34:47,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-07 00:34:47,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-07 00:34:47,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-07 00:34:47,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2019-11-07 00:34:47,173 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2019-11-07 00:34:47,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:47,173 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2019-11-07 00:34:47,173 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 00:34:47,174 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2019-11-07 00:34:47,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 00:34:47,174 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:47,175 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:47,177 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:47,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:47,178 INFO L82 PathProgramCache]: Analyzing trace with hash 620336184, now seen corresponding path program 1 times [2019-11-07 00:34:47,178 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:47,178 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020791540] [2019-11-07 00:34:47,183 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:47,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:47,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:34:47,217 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020791540] [2019-11-07 00:34:47,218 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:34:47,218 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 00:34:47,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914438976] [2019-11-07 00:34:47,219 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 00:34:47,219 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:47,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 00:34:47,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:34:47,220 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 3 states. [2019-11-07 00:34:47,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:47,235 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2019-11-07 00:34:47,236 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 00:34:47,236 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 00:34:47,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:47,237 INFO L225 Difference]: With dead ends: 32 [2019-11-07 00:34:47,238 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 00:34:47,238 INFO L630 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 [2019-11-07 00:34:47,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 00:34:47,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2019-11-07 00:34:47,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-07 00:34:47,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-11-07 00:34:47,244 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 12 [2019-11-07 00:34:47,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:47,245 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-11-07 00:34:47,245 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 00:34:47,245 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-11-07 00:34:47,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-07 00:34:47,246 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:47,246 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:47,247 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:47,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:47,247 INFO L82 PathProgramCache]: Analyzing trace with hash -657196198, now seen corresponding path program 1 times [2019-11-07 00:34:47,248 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:47,248 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564668977] [2019-11-07 00:34:47,248 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:47,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:47,310 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 00:34:47,310 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564668977] [2019-11-07 00:34:47,311 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435841933] [2019-11-07 00:34:47,311 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:47,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:47,372 INFO L256 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 00:34:47,380 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:34:47,411 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 00:34:47,411 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:34:47,450 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 00:34:47,451 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [486953919] [2019-11-07 00:34:47,458 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 19 [2019-11-07 00:34:47,489 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:34:47,489 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:34:47,625 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:34:47,628 INFO L272 AbstractInterpreter]: Visited 14 different actions 73 times. Merged at 5 different actions 32 times. Widened at 1 different actions 5 times. Performed 197 root evaluator evaluations with a maximum evaluation depth of 4. Performed 197 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 10 fixpoints after 3 different actions. Largest state had 5 variables. [2019-11-07 00:34:47,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:47,634 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:34:47,634 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:34:47,634 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2019-11-07 00:34:47,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017684237] [2019-11-07 00:34:47,635 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 00:34:47,636 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:47,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 00:34:47,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-07 00:34:47,637 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 6 states. [2019-11-07 00:34:47,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:47,695 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2019-11-07 00:34:47,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 00:34:47,697 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2019-11-07 00:34:47,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:47,698 INFO L225 Difference]: With dead ends: 40 [2019-11-07 00:34:47,699 INFO L226 Difference]: Without dead ends: 28 [2019-11-07 00:34:47,699 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-07 00:34:47,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-07 00:34:47,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-07 00:34:47,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-07 00:34:47,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-07 00:34:47,709 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 18 [2019-11-07 00:34:47,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:47,710 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-07 00:34:47,711 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 00:34:47,711 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-07 00:34:47,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-07 00:34:47,712 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:47,713 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:47,918 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:47,919 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:47,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:47,920 INFO L82 PathProgramCache]: Analyzing trace with hash -755753187, now seen corresponding path program 2 times [2019-11-07 00:34:47,920 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:47,921 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131454075] [2019-11-07 00:34:47,921 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:47,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:48,018 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-07 00:34:48,018 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131454075] [2019-11-07 00:34:48,019 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164004025] [2019-11-07 00:34:48,019 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:48,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-07 00:34:48,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:34:48,072 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 00:34:48,074 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:34:48,122 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 33 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 00:34:48,123 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:34:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 33 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 00:34:48,189 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1473399100] [2019-11-07 00:34:48,189 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:34:48,189 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:34:48,190 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:34:48,190 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2019-11-07 00:34:48,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056302231] [2019-11-07 00:34:48,191 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-07 00:34:48,191 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:48,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-07 00:34:48,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2019-11-07 00:34:48,209 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2019-11-07 00:34:48,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:48,389 INFO L93 Difference]: Finished difference Result 60 states and 73 transitions. [2019-11-07 00:34:48,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-07 00:34:48,390 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-11-07 00:34:48,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:48,393 INFO L225 Difference]: With dead ends: 60 [2019-11-07 00:34:48,393 INFO L226 Difference]: Without dead ends: 55 [2019-11-07 00:34:48,394 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=89, Invalid=151, Unknown=0, NotChecked=0, Total=240 [2019-11-07 00:34:48,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-07 00:34:48,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 40. [2019-11-07 00:34:48,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-07 00:34:48,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2019-11-07 00:34:48,405 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 27 [2019-11-07 00:34:48,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:48,408 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2019-11-07 00:34:48,408 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-07 00:34:48,408 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2019-11-07 00:34:48,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-07 00:34:48,410 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:48,411 INFO L410 BasicCegarLoop]: trace histogram [10, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:48,611 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:48,612 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:48,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:48,612 INFO L82 PathProgramCache]: Analyzing trace with hash -2049938595, now seen corresponding path program 3 times [2019-11-07 00:34:48,612 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:48,613 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517239372] [2019-11-07 00:34:48,613 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:48,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:48,830 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 49 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:34:48,830 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517239372] [2019-11-07 00:34:48,831 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989920619] [2019-11-07 00:34:48,831 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:48,892 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 00:34:48,892 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:34:48,893 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 00:34:48,899 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:34:48,999 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 74 proven. 26 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-07 00:34:48,999 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:34:49,118 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 74 proven. 26 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-07 00:34:49,120 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [499005109] [2019-11-07 00:34:49,121 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:34:49,121 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:34:49,121 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:34:49,121 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7] total 26 [2019-11-07 00:34:49,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570327649] [2019-11-07 00:34:49,122 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-07 00:34:49,123 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:49,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-07 00:34:49,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=510, Unknown=0, NotChecked=0, Total=650 [2019-11-07 00:34:49,124 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand 26 states. [2019-11-07 00:34:49,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:49,338 INFO L93 Difference]: Finished difference Result 85 states and 103 transitions. [2019-11-07 00:34:49,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 00:34:49,340 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 39 [2019-11-07 00:34:49,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:49,341 INFO L225 Difference]: With dead ends: 85 [2019-11-07 00:34:49,342 INFO L226 Difference]: Without dead ends: 61 [2019-11-07 00:34:49,343 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=313, Invalid=877, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 00:34:49,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-07 00:34:49,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2019-11-07 00:34:49,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-07 00:34:49,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 64 transitions. [2019-11-07 00:34:49,356 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 64 transitions. Word has length 39 [2019-11-07 00:34:49,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:49,358 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 64 transitions. [2019-11-07 00:34:49,358 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-07 00:34:49,358 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 64 transitions. [2019-11-07 00:34:49,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-07 00:34:49,360 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:49,361 INFO L410 BasicCegarLoop]: trace histogram [16, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:49,561 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:49,562 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:49,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:49,563 INFO L82 PathProgramCache]: Analyzing trace with hash 585284605, now seen corresponding path program 4 times [2019-11-07 00:34:49,564 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:49,564 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050601662] [2019-11-07 00:34:49,565 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:49,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 205 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-11-07 00:34:49,717 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050601662] [2019-11-07 00:34:49,717 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251829976] [2019-11-07 00:34:49,718 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:49,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:49,779 INFO L256 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 00:34:49,782 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:34:49,956 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 170 proven. 155 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-07 00:34:49,957 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:34:50,213 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 170 proven. 155 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-07 00:34:50,214 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1295762501] [2019-11-07 00:34:50,214 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:34:50,214 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:34:50,214 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:34:50,215 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 32 [2019-11-07 00:34:50,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913422030] [2019-11-07 00:34:50,216 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-07 00:34:50,216 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:50,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-07 00:34:50,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=684, Unknown=0, NotChecked=0, Total=992 [2019-11-07 00:34:50,217 INFO L87 Difference]: Start difference. First operand 58 states and 64 transitions. Second operand 32 states. [2019-11-07 00:34:51,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:51,543 INFO L93 Difference]: Finished difference Result 178 states and 222 transitions. [2019-11-07 00:34:51,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2019-11-07 00:34:51,543 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 57 [2019-11-07 00:34:51,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:51,545 INFO L225 Difference]: With dead ends: 178 [2019-11-07 00:34:51,545 INFO L226 Difference]: Without dead ends: 154 [2019-11-07 00:34:51,549 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1776 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1759, Invalid=5047, Unknown=0, NotChecked=0, Total=6806 [2019-11-07 00:34:51,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2019-11-07 00:34:51,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 106. [2019-11-07 00:34:51,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-11-07 00:34:51,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2019-11-07 00:34:51,563 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 57 [2019-11-07 00:34:51,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:51,563 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2019-11-07 00:34:51,564 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-07 00:34:51,564 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2019-11-07 00:34:51,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2019-11-07 00:34:51,567 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:51,567 INFO L410 BasicCegarLoop]: trace histogram [29, 28, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:51,770 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:51,771 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:51,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:51,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1756195272, now seen corresponding path program 5 times [2019-11-07 00:34:51,772 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:51,773 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939351729] [2019-11-07 00:34:51,773 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:51,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:51,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 481 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2019-11-07 00:34:51,980 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939351729] [2019-11-07 00:34:51,980 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045932700] [2019-11-07 00:34:51,980 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:52,047 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2019-11-07 00:34:52,047 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:34:52,048 INFO L256 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-07 00:34:52,052 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:34:52,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 764 proven. 121 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2019-11-07 00:34:52,160 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:34:52,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 764 proven. 121 refuted. 0 times theorem prover too weak. 333 trivial. 0 not checked. [2019-11-07 00:34:52,396 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1811452780] [2019-11-07 00:34:52,396 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:34:52,397 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:34:52,397 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:34:52,397 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 19 [2019-11-07 00:34:52,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624596706] [2019-11-07 00:34:52,398 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 00:34:52,398 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:52,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 00:34:52,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2019-11-07 00:34:52,399 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 19 states. [2019-11-07 00:34:52,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:52,753 INFO L93 Difference]: Finished difference Result 236 states and 295 transitions. [2019-11-07 00:34:52,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-07 00:34:52,754 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 96 [2019-11-07 00:34:52,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:52,756 INFO L225 Difference]: With dead ends: 236 [2019-11-07 00:34:52,757 INFO L226 Difference]: Without dead ends: 231 [2019-11-07 00:34:52,758 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 214 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=409, Invalid=851, Unknown=0, NotChecked=0, Total=1260 [2019-11-07 00:34:52,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2019-11-07 00:34:52,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 124. [2019-11-07 00:34:52,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-11-07 00:34:52,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 140 transitions. [2019-11-07 00:34:52,789 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 140 transitions. Word has length 96 [2019-11-07 00:34:52,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:52,791 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 140 transitions. [2019-11-07 00:34:52,791 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 00:34:52,791 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 140 transitions. [2019-11-07 00:34:52,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-11-07 00:34:52,795 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:52,795 INFO L410 BasicCegarLoop]: trace histogram [38, 37, 22, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:53,000 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:53,001 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:53,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:53,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1838430173, now seen corresponding path program 6 times [2019-11-07 00:34:53,002 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:53,002 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569444823] [2019-11-07 00:34:53,003 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:53,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 1372 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2019-11-07 00:34:53,361 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569444823] [2019-11-07 00:34:53,361 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177804222] [2019-11-07 00:34:53,361 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:53,433 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 00:34:53,433 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:34:53,435 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 00:34:53,440 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:34:53,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1042 proven. 737 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2019-11-07 00:34:53,926 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:34:54,976 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1042 proven. 737 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2019-11-07 00:34:54,977 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [483126118] [2019-11-07 00:34:54,977 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:34:54,977 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:34:54,977 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:34:54,977 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 25, 25] total 66 [2019-11-07 00:34:54,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590585594] [2019-11-07 00:34:54,978 INFO L442 AbstractCegarLoop]: Interpolant automaton has 66 states [2019-11-07 00:34:54,978 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:34:54,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2019-11-07 00:34:54,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=3005, Unknown=0, NotChecked=0, Total=4290 [2019-11-07 00:34:54,981 INFO L87 Difference]: Start difference. First operand 124 states and 140 transitions. Second operand 66 states. [2019-11-07 00:34:58,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:34:58,585 INFO L93 Difference]: Finished difference Result 575 states and 721 transitions. [2019-11-07 00:34:58,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2019-11-07 00:34:58,585 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 123 [2019-11-07 00:34:58,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:34:58,589 INFO L225 Difference]: With dead ends: 575 [2019-11-07 00:34:58,589 INFO L226 Difference]: Without dead ends: 521 [2019-11-07 00:34:58,597 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8457 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=7266, Invalid=23184, Unknown=0, NotChecked=0, Total=30450 [2019-11-07 00:34:58,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2019-11-07 00:34:58,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 223. [2019-11-07 00:34:58,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2019-11-07 00:34:58,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 248 transitions. [2019-11-07 00:34:58,625 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 248 transitions. Word has length 123 [2019-11-07 00:34:58,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:34:58,625 INFO L462 AbstractCegarLoop]: Abstraction has 223 states and 248 transitions. [2019-11-07 00:34:58,625 INFO L463 AbstractCegarLoop]: Interpolant automaton has 66 states. [2019-11-07 00:34:58,625 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 248 transitions. [2019-11-07 00:34:58,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2019-11-07 00:34:58,629 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:34:58,629 INFO L410 BasicCegarLoop]: trace histogram [63, 62, 46, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:34:58,832 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:58,833 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:34:58,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:34:58,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1470505704, now seen corresponding path program 7 times [2019-11-07 00:34:58,835 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:34:58,835 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186786707] [2019-11-07 00:34:58,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:34:58,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:59,222 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 0 proven. 2662 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2019-11-07 00:34:59,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186786707] [2019-11-07 00:34:59,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676624758] [2019-11-07 00:34:59,223 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:34:59,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:34:59,312 INFO L256 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 48 conjunts are in the unsatisfiable core [2019-11-07 00:34:59,319 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:35:00,582 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 2286 proven. 3197 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2019-11-07 00:35:00,582 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:35:01,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 2286 proven. 3197 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2019-11-07 00:35:01,984 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [519710990] [2019-11-07 00:35:01,984 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:35:01,985 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:35:01,985 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:35:01,985 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 49, 49] total 71 [2019-11-07 00:35:01,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124805881] [2019-11-07 00:35:01,986 INFO L442 AbstractCegarLoop]: Interpolant automaton has 71 states [2019-11-07 00:35:01,986 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:35:01,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2019-11-07 00:35:01,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1501, Invalid=3469, Unknown=0, NotChecked=0, Total=4970 [2019-11-07 00:35:01,989 INFO L87 Difference]: Start difference. First operand 223 states and 248 transitions. Second operand 71 states. [2019-11-07 00:35:06,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:35:06,550 INFO L93 Difference]: Finished difference Result 680 states and 833 transitions. [2019-11-07 00:35:06,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2019-11-07 00:35:06,550 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 198 [2019-11-07 00:35:06,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:35:06,554 INFO L225 Difference]: With dead ends: 680 [2019-11-07 00:35:06,554 INFO L226 Difference]: Without dead ends: 599 [2019-11-07 00:35:06,561 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 394 SyntacticMatches, 44 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10803 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8510, Invalid=27022, Unknown=0, NotChecked=0, Total=35532 [2019-11-07 00:35:06,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2019-11-07 00:35:06,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 238. [2019-11-07 00:35:06,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2019-11-07 00:35:06,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 264 transitions. [2019-11-07 00:35:06,582 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 264 transitions. Word has length 198 [2019-11-07 00:35:06,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:35:06,583 INFO L462 AbstractCegarLoop]: Abstraction has 238 states and 264 transitions. [2019-11-07 00:35:06,583 INFO L463 AbstractCegarLoop]: Interpolant automaton has 71 states. [2019-11-07 00:35:06,583 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 264 transitions. [2019-11-07 00:35:06,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2019-11-07 00:35:06,586 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:35:06,586 INFO L410 BasicCegarLoop]: trace histogram [68, 67, 50, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:35:06,800 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:35:06,800 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:35:06,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:35:06,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1155791421, now seen corresponding path program 8 times [2019-11-07 00:35:06,801 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:35:06,801 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193515337] [2019-11-07 00:35:06,802 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:35:06,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:35:08,005 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 5880 proven. 902 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-11-07 00:35:08,005 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193515337] [2019-11-07 00:35:08,005 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749064647] [2019-11-07 00:35:08,006 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:35:08,125 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2019-11-07 00:35:08,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:35:08,127 INFO L256 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 38 conjunts are in the unsatisfiable core [2019-11-07 00:35:08,131 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:35:08,168 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 4393 proven. 902 refuted. 0 times theorem prover too weak. 1539 trivial. 0 not checked. [2019-11-07 00:35:08,169 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:35:08,448 INFO L134 CoverageAnalysis]: Checked inductivity of 6834 backedges. 4393 proven. 902 refuted. 0 times theorem prover too weak. 1539 trivial. 0 not checked. [2019-11-07 00:35:08,448 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [8644329] [2019-11-07 00:35:08,448 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:35:08,449 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:35:08,449 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:35:08,449 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 21, 21] total 53 [2019-11-07 00:35:08,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837257087] [2019-11-07 00:35:08,450 INFO L442 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-11-07 00:35:08,450 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:35:08,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-11-07 00:35:08,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 00:35:08,451 INFO L87 Difference]: Start difference. First operand 238 states and 264 transitions. Second operand 53 states. [2019-11-07 00:35:08,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:35:08,942 INFO L93 Difference]: Finished difference Result 1318 states and 1730 transitions. [2019-11-07 00:35:08,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-11-07 00:35:08,943 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 213 [2019-11-07 00:35:08,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:35:08,949 INFO L225 Difference]: With dead ends: 1318 [2019-11-07 00:35:08,950 INFO L226 Difference]: Without dead ends: 1313 [2019-11-07 00:35:08,951 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 409 SyntacticMatches, 36 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1476 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 00:35:08,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1313 states. [2019-11-07 00:35:08,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1313 to 313. [2019-11-07 00:35:08,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2019-11-07 00:35:08,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 364 transitions. [2019-11-07 00:35:08,976 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 364 transitions. Word has length 213 [2019-11-07 00:35:08,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:35:08,978 INFO L462 AbstractCegarLoop]: Abstraction has 313 states and 364 transitions. [2019-11-07 00:35:08,978 INFO L463 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-11-07 00:35:08,978 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 364 transitions. [2019-11-07 00:35:08,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2019-11-07 00:35:08,985 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:35:08,985 INFO L410 BasicCegarLoop]: trace histogram [101, 100, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:35:09,197 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:35:09,197 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:35:09,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:35:09,198 INFO L82 PathProgramCache]: Analyzing trace with hash -644776136, now seen corresponding path program 9 times [2019-11-07 00:35:09,198 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:35:09,198 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9959522] [2019-11-07 00:35:09,199 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:35:09,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:35:13,203 INFO L134 CoverageAnalysis]: Checked inductivity of 15150 backedges. 0 proven. 15150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:35:13,203 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9959522] [2019-11-07 00:35:13,203 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513953060] [2019-11-07 00:35:13,203 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:35:13,363 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 00:35:13,363 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 00:35:13,370 INFO L256 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 208 conjunts are in the unsatisfiable core [2019-11-07 00:35:13,375 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:35:16,745 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 00:35:17,025 INFO L134 CoverageAnalysis]: Checked inductivity of 15150 backedges. 0 proven. 15150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:35:17,026 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:35:18,998 INFO L134 CoverageAnalysis]: Checked inductivity of 15150 backedges. 0 proven. 15150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:35:18,999 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [889917486] [2019-11-07 00:35:18,999 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-11-07 00:35:18,999 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-11-07 00:35:18,999 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:35:19,000 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 105, 105] total 158 [2019-11-07 00:35:19,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090353524] [2019-11-07 00:35:19,001 INFO L442 AbstractCegarLoop]: Interpolant automaton has 158 states [2019-11-07 00:35:19,001 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:35:19,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2019-11-07 00:35:19,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2916, Invalid=21890, Unknown=0, NotChecked=0, Total=24806 [2019-11-07 00:35:19,003 INFO L87 Difference]: Start difference. First operand 313 states and 364 transitions. Second operand 158 states.