/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/list-simple/dll2n_prepend_equal.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:08:36,584 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:08:36,586 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:08:36,601 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:08:36,601 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:08:36,604 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:08:36,605 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:08:36,615 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:08:36,619 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:08:36,622 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:08:36,625 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:08:36,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:08:36,626 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:08:36,628 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:08:36,630 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:08:36,631 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:08:36,633 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:08:36,633 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:08:36,635 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:08:36,639 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:08:36,644 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:08:36,648 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:08:36,649 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:08:36,650 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:08:36,651 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:08:36,662 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:08:36,662 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:08:36,664 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:08:36,664 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-24 04:08:36,701 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:08:36,701 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:08:36,702 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:08:36,702 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:08:36,703 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:08:36,703 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:08:36,703 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:08:36,703 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:08:36,703 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:08:36,703 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:08:36,704 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:08:36,704 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:08:36,704 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:08:36,704 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:08:36,704 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:08:36,705 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:08:36,705 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:08:36,705 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:08:36,706 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:08:36,706 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:08:36,706 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:08:36,706 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:08:36,706 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:08:36,707 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:08:36,707 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:08:36,707 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:08:36,707 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:08:36,707 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:08:36,707 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:08:36,708 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:08:36,708 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:08:36,708 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:08:36,708 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:08:36,708 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:08:36,709 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:08:36,709 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:08:36,709 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:08:36,709 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:08:37,025 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:08:37,047 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:08:37,052 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:08:37,053 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:08:37,055 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:08:37,055 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-simple/dll2n_prepend_equal.i [2019-11-24 04:08:37,125 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4eb190533/8b6fc64126a94f5e80206c78f9bf20c7/FLAGa37561e2a [2019-11-24 04:08:37,648 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:08:37,652 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-simple/dll2n_prepend_equal.i [2019-11-24 04:08:37,673 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4eb190533/8b6fc64126a94f5e80206c78f9bf20c7/FLAGa37561e2a [2019-11-24 04:08:38,131 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4eb190533/8b6fc64126a94f5e80206c78f9bf20c7 [2019-11-24 04:08:38,139 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:08:38,140 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:08:38,141 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:08:38,142 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:08:38,145 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:08:38,146 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,149 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d72817c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38, skipping insertion in model container [2019-11-24 04:08:38,149 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,156 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:08:38,208 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:08:38,715 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:08:38,727 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:08:38,772 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:08:38,839 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:08:38,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38 WrapperNode [2019-11-24 04:08:38,841 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:08:38,841 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:08:38,842 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:08:38,842 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:08:38,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,890 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,919 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:08:38,919 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:08:38,919 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:08:38,920 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:08:38,926 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,930 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,931 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,939 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,944 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,946 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (1/1) ... [2019-11-24 04:08:38,949 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:08:38,950 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:08:38,950 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:08:38,950 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:08:38,951 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (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 [2019-11-24 04:08:39,013 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-24 04:08:39,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-24 04:08:39,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-24 04:08:39,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:08:39,014 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-11-24 04:08:39,014 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-11-24 04:08:39,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-24 04:08:39,014 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2019-11-24 04:08:39,014 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:08:39,014 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:08:39,754 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:08:39,757 INFO L284 CfgBuilder]: Removed 19 assume(true) statements. [2019-11-24 04:08:39,759 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:08:39 BoogieIcfgContainer [2019-11-24 04:08:39,759 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:08:39,761 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:08:39,761 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:08:39,765 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:08:39,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:08:38" (1/3) ... [2019-11-24 04:08:39,767 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@777fe94d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:08:39, skipping insertion in model container [2019-11-24 04:08:39,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:08:38" (2/3) ... [2019-11-24 04:08:39,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@777fe94d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:08:39, skipping insertion in model container [2019-11-24 04:08:39,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:08:39" (3/3) ... [2019-11-24 04:08:39,773 INFO L109 eAbstractionObserver]: Analyzing ICFG dll2n_prepend_equal.i [2019-11-24 04:08:39,783 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:08:39,791 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 04:08:39,802 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 04:08:39,831 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:08:39,831 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:08:39,832 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:08:39,832 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:08:39,832 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:08:39,833 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:08:39,833 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:08:39,833 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:08:39,849 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2019-11-24 04:08:39,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-24 04:08:39,857 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:08:39,858 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-24 04:08:39,859 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:08:39,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:08:39,865 INFO L82 PathProgramCache]: Analyzing trace with hash -588270765, now seen corresponding path program 1 times [2019-11-24 04:08:39,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:08:39,876 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561364159] [2019-11-24 04:08:39,876 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:08:39,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:40,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:08:40,062 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561364159] [2019-11-24 04:08:40,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:08:40,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 04:08:40,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471374723] [2019-11-24 04:08:40,069 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 04:08:40,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:08:40,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 04:08:40,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:08:40,084 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 3 states. [2019-11-24 04:08:40,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:08:40,141 INFO L93 Difference]: Finished difference Result 27 states and 39 transitions. [2019-11-24 04:08:40,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 04:08:40,143 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-11-24 04:08:40,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:08:40,156 INFO L225 Difference]: With dead ends: 27 [2019-11-24 04:08:40,157 INFO L226 Difference]: Without dead ends: 11 [2019-11-24 04:08:40,161 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 04:08:40,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-11-24 04:08:40,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2019-11-24 04:08:40,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-11-24 04:08:40,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2019-11-24 04:08:40,191 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6 [2019-11-24 04:08:40,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:08:40,191 INFO L462 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2019-11-24 04:08:40,191 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 04:08:40,192 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2019-11-24 04:08:40,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-24 04:08:40,192 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:08:40,192 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:08:40,192 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:08:40,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:08:40,193 INFO L82 PathProgramCache]: Analyzing trace with hash 591151379, now seen corresponding path program 1 times [2019-11-24 04:08:40,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:08:40,194 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178077130] [2019-11-24 04:08:40,194 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:08:40,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:40,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:08:40,346 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178077130] [2019-11-24 04:08:40,346 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501687498] [2019-11-24 04:08:40,346 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 [2019-11-24 04:08:40,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:40,443 INFO L255 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 04:08:40,449 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:08:40,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:08:40,488 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:08:40,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:08:40,512 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000238663] [2019-11-24 04:08:40,549 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-24 04:08:40,550 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:08:40,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:08:40,591 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:08:40,592 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:08:40,957 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:41,379 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:42,540 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:43,064 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:43,172 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:43,874 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:44,536 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:44,557 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:45,516 WARN L192 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 420 [2019-11-24 04:08:46,547 WARN L192 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 429 [2019-11-24 04:08:46,749 WARN L192 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 430 [2019-11-24 04:08:47,830 WARN L192 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 441 [2019-11-24 04:08:48,029 WARN L192 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 445 [2019-11-24 04:08:48,199 WARN L192 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 443 [2019-11-24 04:08:49,343 WARN L192 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 445 [2019-11-24 04:08:49,383 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:49,413 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:49,515 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 329 [2019-11-24 04:08:49,541 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:49,569 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:49,980 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:08:50,614 WARN L192 SmtUtils]: Spent 484.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 101 [2019-11-24 04:08:50,860 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:08:51,757 WARN L192 SmtUtils]: Spent 851.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:08:52,270 WARN L192 SmtUtils]: Spent 487.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 94 [2019-11-24 04:08:52,968 WARN L192 SmtUtils]: Spent 640.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 133 [2019-11-24 04:08:52,987 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:08:52,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:08:52,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2019-11-24 04:08:52,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019292376] [2019-11-24 04:08:52,990 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 04:08:52,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:08:52,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 04:08:52,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-11-24 04:08:52,992 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand 5 states. [2019-11-24 04:08:53,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:08:53,038 INFO L93 Difference]: Finished difference Result 18 states and 22 transitions. [2019-11-24 04:08:53,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:08:53,039 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2019-11-24 04:08:53,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:08:53,039 INFO L225 Difference]: With dead ends: 18 [2019-11-24 04:08:53,039 INFO L226 Difference]: Without dead ends: 12 [2019-11-24 04:08:53,040 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-11-24 04:08:53,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-24 04:08:53,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-24 04:08:53,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-24 04:08:53,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2019-11-24 04:08:53,043 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 8 [2019-11-24 04:08:53,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:08:53,043 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2019-11-24 04:08:53,044 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 04:08:53,044 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2019-11-24 04:08:53,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-24 04:08:53,044 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:08:53,044 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2019-11-24 04:08:53,251 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 04:08:53,252 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:08:53,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:08:53,253 INFO L82 PathProgramCache]: Analyzing trace with hash 144465619, now seen corresponding path program 2 times [2019-11-24 04:08:53,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:08:53,254 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498292503] [2019-11-24 04:08:53,254 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:08:53,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:53,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-24 04:08:53,347 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498292503] [2019-11-24 04:08:53,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:08:53,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 04:08:53,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018199089] [2019-11-24 04:08:53,348 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 04:08:53,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:08:53,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 04:08:53,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-24 04:08:53,349 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 4 states. [2019-11-24 04:08:53,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:08:53,381 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2019-11-24 04:08:53,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:08:53,382 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2019-11-24 04:08:53,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:08:53,382 INFO L225 Difference]: With dead ends: 19 [2019-11-24 04:08:53,383 INFO L226 Difference]: Without dead ends: 16 [2019-11-24 04:08:53,383 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-24 04:08:53,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-24 04:08:53,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2019-11-24 04:08:53,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-24 04:08:53,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2019-11-24 04:08:53,387 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 10 [2019-11-24 04:08:53,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:08:53,388 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2019-11-24 04:08:53,388 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 04:08:53,388 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2019-11-24 04:08:53,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-24 04:08:53,389 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:08:53,389 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2019-11-24 04:08:53,389 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:08:53,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:08:53,389 INFO L82 PathProgramCache]: Analyzing trace with hash 144425009, now seen corresponding path program 1 times [2019-11-24 04:08:53,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:08:53,390 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893473424] [2019-11-24 04:08:53,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:08:53,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:53,677 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:08:53,677 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893473424] [2019-11-24 04:08:53,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:08:53,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-24 04:08:53,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386311213] [2019-11-24 04:08:53,678 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-24 04:08:53,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:08:53,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-24 04:08:53,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-24 04:08:53,679 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 8 states. [2019-11-24 04:08:53,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:08:53,895 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2019-11-24 04:08:53,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-24 04:08:53,896 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2019-11-24 04:08:53,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:08:53,897 INFO L225 Difference]: With dead ends: 16 [2019-11-24 04:08:53,897 INFO L226 Difference]: Without dead ends: 14 [2019-11-24 04:08:53,898 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2019-11-24 04:08:53,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-24 04:08:53,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-24 04:08:53,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-24 04:08:53,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2019-11-24 04:08:53,902 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2019-11-24 04:08:53,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:08:53,902 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2019-11-24 04:08:53,902 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-24 04:08:53,903 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2019-11-24 04:08:53,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-24 04:08:53,903 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:08:53,903 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 04:08:53,904 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:08:53,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:08:53,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1353555502, now seen corresponding path program 1 times [2019-11-24 04:08:53,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:08:53,904 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358014455] [2019-11-24 04:08:53,905 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:08:53,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:54,116 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:08:54,116 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358014455] [2019-11-24 04:08:54,117 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688097800] [2019-11-24 04:08:54,117 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-24 04:08:54,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:08:54,205 INFO L255 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 56 conjunts are in the unsatisfiable core [2019-11-24 04:08:54,212 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:08:54,567 WARN L192 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 54 [2019-11-24 04:08:54,830 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:08:54,830 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:08:55,003 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2019-11-24 04:08:56,242 WARN L192 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 125 DAG size of output: 114 [2019-11-24 04:08:59,738 WARN L192 SmtUtils]: Spent 3.23 s on a formula simplification. DAG size of input: 217 DAG size of output: 150 [2019-11-24 04:09:00,309 WARN L192 SmtUtils]: Spent 560.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2019-11-24 04:09:01,240 WARN L192 SmtUtils]: Spent 889.00 ms on a formula simplification that was a NOOP. DAG size: 191 [2019-11-24 04:09:12,643 WARN L192 SmtUtils]: Spent 8.26 s on a formula simplification that was a NOOP. DAG size: 195 [2019-11-24 04:09:14,949 WARN L192 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 626 DAG size of output: 49 [2019-11-24 04:09:15,135 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 52 [2019-11-24 04:09:15,347 WARN L192 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2019-11-24 04:09:15,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 04:09:15,472 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [478518855] [2019-11-24 04:09:15,475 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2019-11-24 04:09:15,476 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:09:15,476 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:09:15,476 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:09:15,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:09:15,574 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:15,830 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:16,576 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:17,130 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:17,270 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:17,806 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:18,317 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:18,329 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:19,366 WARN L192 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 420 [2019-11-24 04:09:19,534 WARN L192 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 424 [2019-11-24 04:09:21,375 WARN L192 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 435 [2019-11-24 04:09:21,575 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 436 [2019-11-24 04:09:22,738 WARN L192 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 445 [2019-11-24 04:09:23,067 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 447 [2019-11-24 04:09:23,222 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 445 [2019-11-24 04:09:23,246 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:23,275 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:38,602 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:38,686 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:38,716 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 04:09:39,285 WARN L192 SmtUtils]: Spent 448.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 101 [2019-11-24 04:09:39,538 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 04:09:40,713 WARN L192 SmtUtils]: Spent 877.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 101 [2019-11-24 04:09:41,305 WARN L192 SmtUtils]: Spent 510.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 94 [2019-11-24 04:09:42,037 WARN L192 SmtUtils]: Spent 636.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 133 [2019-11-24 04:09:42,563 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 04:09:42,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 04:09:42,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2019-11-24 04:09:42,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721878328] [2019-11-24 04:09:42,564 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-24 04:09:42,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:09:42,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-24 04:09:42,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=551, Unknown=1, NotChecked=0, Total=650 [2019-11-24 04:09:42,565 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 19 states. [2019-11-24 04:09:57,004 WARN L192 SmtUtils]: Spent 13.93 s on a formula simplification. DAG size of input: 240 DAG size of output: 238 [2019-11-24 04:10:10,478 WARN L192 SmtUtils]: Spent 11.37 s on a formula simplification. DAG size of input: 243 DAG size of output: 241 [2019-11-24 04:10:12,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:10:12,687 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2019-11-24 04:10:12,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-24 04:10:12,688 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 12 [2019-11-24 04:10:12,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:10:12,689 INFO L225 Difference]: With dead ends: 21 [2019-11-24 04:10:12,689 INFO L226 Difference]: Without dead ends: 18 [2019-11-24 04:10:12,690 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 42.9s TimeCoverageRelationStatistics Valid=208, Invalid=846, Unknown=2, NotChecked=0, Total=1056 [2019-11-24 04:10:12,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-24 04:10:12,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2019-11-24 04:10:12,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-24 04:10:12,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-11-24 04:10:12,694 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2019-11-24 04:10:12,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:10:12,694 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-11-24 04:10:12,694 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-24 04:10:12,694 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-11-24 04:10:12,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-24 04:10:12,695 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:10:12,695 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1]