/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/ssh-simplified/s3_clnt_4.cil-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 06:01:57,024 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 06:01:57,026 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 06:01:57,044 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-24 06:01:57,063 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 06:01:57,064 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 06:01:57,065 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 06:01:57,066 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 06:01:57,067 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 06:01:57,067 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 06:01:57,069 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 06:01:57,071 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 06:01:57,072 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 06:01:57,073 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 06:01:57,074 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 06:01:57,074 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 06:01:57,076 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 06:01:57,086 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 06:01:57,100 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 06:01:57,100 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 06:01:57,101 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 06:01:57,101 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 06:01:57,102 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 06:01:57,102 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 06:01:57,102 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 06:01:57,102 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 06:01:57,102 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 06:01:57,103 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 06:01:57,103 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 06:01:57,103 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 06:01:57,103 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 06:01:57,103 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 06:01:57,104 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 06:01:57,104 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 06:01:57,104 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 06:01:57,105 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 06:01:57,105 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 06:01:57,105 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 06:01:57,105 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 06:01:57,105 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 06:01:57,105 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 06:01:57,106 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 06:01:57,106 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 06:01:57,106 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 06:01:57,106 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 06:01:57,106 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 06:01:57,107 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 06:01:57,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 06:01:57,107 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 06:01:57,107 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 06:01:57,107 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 06:01:57,108 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 06:01:57,108 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 06:01:57,108 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 06:01:57,108 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 06:01:57,108 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 06:01:57,407 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 06:01:57,425 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 06:01:57,430 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 06:01:57,431 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 06:01:57,432 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 06:01:57,432 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ssh-simplified/s3_clnt_4.cil-1.c [2019-11-24 06:01:57,511 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/581801b24/f2ff236dc31745988bef974f2fceba3a/FLAGb75863572 [2019-11-24 06:01:58,051 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 06:01:58,052 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ssh-simplified/s3_clnt_4.cil-1.c [2019-11-24 06:01:58,070 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/581801b24/f2ff236dc31745988bef974f2fceba3a/FLAGb75863572 [2019-11-24 06:01:58,335 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/581801b24/f2ff236dc31745988bef974f2fceba3a [2019-11-24 06:01:58,345 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 06:01:58,347 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 06:01:58,348 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 06:01:58,348 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 06:01:58,351 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 06:01:58,352 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,354 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44996807 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58, skipping insertion in model container [2019-11-24 06:01:58,354 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,360 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 06:01:58,413 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 06:01:58,682 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:01:58,769 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 06:01:58,825 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:01:58,842 INFO L208 MainTranslator]: Completed translation [2019-11-24 06:01:58,843 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58 WrapperNode [2019-11-24 06:01:58,843 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 06:01:58,844 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 06:01:58,844 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 06:01:58,844 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 06:01:58,857 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,865 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,910 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 06:01:58,910 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 06:01:58,911 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 06:01:58,911 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 06:01:58,921 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,921 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,925 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,925 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,933 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,941 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,944 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (1/1) ... [2019-11-24 06:01:58,949 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 06:01:58,950 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 06:01:58,950 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 06:01:58,950 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 06:01:58,951 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (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 06:01:59,018 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 06:01:59,019 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 06:01:59,179 WARN L735 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2019-11-24 06:01:59,741 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##85: assume !false; [2019-11-24 06:01:59,742 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##84: assume false; [2019-11-24 06:02:00,115 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 06:02:00,116 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-24 06:02:00,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:02:00 BoogieIcfgContainer [2019-11-24 06:02:00,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 06:02:00,118 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 06:02:00,119 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 06:02:00,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 06:02:00,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 06:01:58" (1/3) ... [2019-11-24 06:02:00,123 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28038071 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:02:00, skipping insertion in model container [2019-11-24 06:02:00,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:58" (2/3) ... [2019-11-24 06:02:00,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28038071 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:02:00, skipping insertion in model container [2019-11-24 06:02:00,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:02:00" (3/3) ... [2019-11-24 06:02:00,126 INFO L109 eAbstractionObserver]: Analyzing ICFG s3_clnt_4.cil-1.c [2019-11-24 06:02:00,136 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 06:02:00,144 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 06:02:00,158 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 06:02:00,187 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 06:02:00,188 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 06:02:00,188 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 06:02:00,188 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 06:02:00,188 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 06:02:00,189 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 06:02:00,189 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 06:02:00,189 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 06:02:00,210 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2019-11-24 06:02:00,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-24 06:02:00,219 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:00,220 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:00,220 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:00,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:00,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1584347361, now seen corresponding path program 1 times [2019-11-24 06:02:00,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:00,241 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923387745] [2019-11-24 06:02:00,241 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:00,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:00,446 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 06:02:00,447 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923387745] [2019-11-24 06:02:00,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:00,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:02:00,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673476845] [2019-11-24 06:02:00,456 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:00,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:00,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:00,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:00,475 INFO L87 Difference]: Start difference. First operand 85 states. Second operand 3 states. [2019-11-24 06:02:00,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:00,706 INFO L93 Difference]: Finished difference Result 171 states and 295 transitions. [2019-11-24 06:02:00,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:00,709 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-24 06:02:00,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:00,729 INFO L225 Difference]: With dead ends: 171 [2019-11-24 06:02:00,729 INFO L226 Difference]: Without dead ends: 84 [2019-11-24 06:02:00,740 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 06:02:00,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-24 06:02:00,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-24 06:02:00,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-24 06:02:00,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2019-11-24 06:02:00,816 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 19 [2019-11-24 06:02:00,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:00,817 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2019-11-24 06:02:00,818 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:00,818 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2019-11-24 06:02:00,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-24 06:02:00,819 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:00,819 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:00,820 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:00,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:00,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1189841522, now seen corresponding path program 1 times [2019-11-24 06:02:00,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:00,821 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096277654] [2019-11-24 06:02:00,821 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:00,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:00,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:00,932 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096277654] [2019-11-24 06:02:00,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:00,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:00,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457136206] [2019-11-24 06:02:00,934 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:00,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:00,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:00,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:00,935 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand 3 states. [2019-11-24 06:02:01,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:01,136 INFO L93 Difference]: Finished difference Result 180 states and 263 transitions. [2019-11-24 06:02:01,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:01,137 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-11-24 06:02:01,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:01,140 INFO L225 Difference]: With dead ends: 180 [2019-11-24 06:02:01,141 INFO L226 Difference]: Without dead ends: 99 [2019-11-24 06:02:01,145 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 [2019-11-24 06:02:01,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-24 06:02:01,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2019-11-24 06:02:01,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-11-24 06:02:01,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 137 transitions. [2019-11-24 06:02:01,163 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 137 transitions. Word has length 28 [2019-11-24 06:02:01,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:01,164 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 137 transitions. [2019-11-24 06:02:01,164 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:01,164 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 137 transitions. [2019-11-24 06:02:01,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-24 06:02:01,169 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:01,169 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:01,170 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:01,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:01,171 INFO L82 PathProgramCache]: Analyzing trace with hash -615899664, now seen corresponding path program 1 times [2019-11-24 06:02:01,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:01,172 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162386517] [2019-11-24 06:02:01,172 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:01,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:01,246 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:01,247 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162386517] [2019-11-24 06:02:01,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:01,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:01,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354920031] [2019-11-24 06:02:01,248 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:01,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:01,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:01,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:01,249 INFO L87 Difference]: Start difference. First operand 97 states and 137 transitions. Second operand 3 states. [2019-11-24 06:02:01,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:01,375 INFO L93 Difference]: Finished difference Result 208 states and 299 transitions. [2019-11-24 06:02:01,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:01,376 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 39 [2019-11-24 06:02:01,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:01,378 INFO L225 Difference]: With dead ends: 208 [2019-11-24 06:02:01,378 INFO L226 Difference]: Without dead ends: 114 [2019-11-24 06:02:01,379 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 [2019-11-24 06:02:01,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-24 06:02:01,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2019-11-24 06:02:01,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-11-24 06:02:01,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 155 transitions. [2019-11-24 06:02:01,388 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 155 transitions. Word has length 39 [2019-11-24 06:02:01,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:01,389 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 155 transitions. [2019-11-24 06:02:01,389 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:01,389 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 155 transitions. [2019-11-24 06:02:01,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-24 06:02:01,391 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:01,391 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:01,392 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:01,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:01,392 INFO L82 PathProgramCache]: Analyzing trace with hash -200842674, now seen corresponding path program 1 times [2019-11-24 06:02:01,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:01,393 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651886753] [2019-11-24 06:02:01,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:01,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:01,493 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:01,494 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651886753] [2019-11-24 06:02:01,494 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38041264] [2019-11-24 06:02:01,494 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 06:02:01,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:01,582 INFO L255 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 06:02:01,591 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:01,660 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-24 06:02:01,660 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:01,691 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-24 06:02:01,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:02:01,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 9 [2019-11-24 06:02:01,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825097404] [2019-11-24 06:02:01,692 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 06:02:01,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:01,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 06:02:01,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:02:01,693 INFO L87 Difference]: Start difference. First operand 112 states and 155 transitions. Second operand 6 states. [2019-11-24 06:02:02,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:02,041 INFO L93 Difference]: Finished difference Result 315 states and 470 transitions. [2019-11-24 06:02:02,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 06:02:02,042 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2019-11-24 06:02:02,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:02,045 INFO L225 Difference]: With dead ends: 315 [2019-11-24 06:02:02,045 INFO L226 Difference]: Without dead ends: 205 [2019-11-24 06:02:02,046 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:02:02,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2019-11-24 06:02:02,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 187. [2019-11-24 06:02:02,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-11-24 06:02:02,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 256 transitions. [2019-11-24 06:02:02,063 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 256 transitions. Word has length 52 [2019-11-24 06:02:02,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:02,063 INFO L462 AbstractCegarLoop]: Abstraction has 187 states and 256 transitions. [2019-11-24 06:02:02,063 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 06:02:02,065 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 256 transitions. [2019-11-24 06:02:02,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-24 06:02:02,067 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:02,067 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:02,272 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:02,273 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:02,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:02,273 INFO L82 PathProgramCache]: Analyzing trace with hash 171720553, now seen corresponding path program 1 times [2019-11-24 06:02:02,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:02,275 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302550228] [2019-11-24 06:02:02,275 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:02,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:02,335 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-24 06:02:02,335 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302550228] [2019-11-24 06:02:02,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:02,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:02,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667686784] [2019-11-24 06:02:02,336 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:02,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:02,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:02,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:02,337 INFO L87 Difference]: Start difference. First operand 187 states and 256 transitions. Second operand 3 states. [2019-11-24 06:02:02,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:02,459 INFO L93 Difference]: Finished difference Result 392 states and 545 transitions. [2019-11-24 06:02:02,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:02,460 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 68 [2019-11-24 06:02:02,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:02,462 INFO L225 Difference]: With dead ends: 392 [2019-11-24 06:02:02,462 INFO L226 Difference]: Without dead ends: 208 [2019-11-24 06:02:02,463 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 [2019-11-24 06:02:02,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2019-11-24 06:02:02,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2019-11-24 06:02:02,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2019-11-24 06:02:02,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 278 transitions. [2019-11-24 06:02:02,488 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 278 transitions. Word has length 68 [2019-11-24 06:02:02,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:02,488 INFO L462 AbstractCegarLoop]: Abstraction has 206 states and 278 transitions. [2019-11-24 06:02:02,488 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:02,488 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 278 transitions. [2019-11-24 06:02:02,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-24 06:02:02,494 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:02,494 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:02,494 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:02,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:02,495 INFO L82 PathProgramCache]: Analyzing trace with hash -956323728, now seen corresponding path program 1 times [2019-11-24 06:02:02,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:02,495 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476524913] [2019-11-24 06:02:02,495 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:02,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:02,654 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-24 06:02:02,655 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476524913] [2019-11-24 06:02:02,655 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266343318] [2019-11-24 06:02:02,655 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 06:02:02,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:02,774 INFO L255 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-24 06:02:02,783 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:02,810 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-11-24 06:02:02,811 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:02,819 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:02,831 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:02,838 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:02,856 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-11-24 06:02:02,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-24 06:02:02,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 6 [2019-11-24 06:02:02,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963980866] [2019-11-24 06:02:02,858 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:02,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:02,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:02,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-24 06:02:02,859 INFO L87 Difference]: Start difference. First operand 206 states and 278 transitions. Second operand 3 states. [2019-11-24 06:02:02,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:02,885 INFO L93 Difference]: Finished difference Result 408 states and 552 transitions. [2019-11-24 06:02:02,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:02,886 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 86 [2019-11-24 06:02:02,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:02,889 INFO L225 Difference]: With dead ends: 408 [2019-11-24 06:02:02,889 INFO L226 Difference]: Without dead ends: 406 [2019-11-24 06:02:02,889 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 166 SyntacticMatches, 4 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-24 06:02:02,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2019-11-24 06:02:02,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 406. [2019-11-24 06:02:02,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 406 states. [2019-11-24 06:02:02,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 550 transitions. [2019-11-24 06:02:02,904 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 550 transitions. Word has length 86 [2019-11-24 06:02:02,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:02,905 INFO L462 AbstractCegarLoop]: Abstraction has 406 states and 550 transitions. [2019-11-24 06:02:02,905 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:02,905 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 550 transitions. [2019-11-24 06:02:02,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-24 06:02:02,907 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:02,908 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:03,111 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:03,111 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:03,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:03,112 INFO L82 PathProgramCache]: Analyzing trace with hash -946815228, now seen corresponding path program 1 times [2019-11-24 06:02:03,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:03,114 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312531962] [2019-11-24 06:02:03,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:03,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:03,227 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:03,227 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312531962] [2019-11-24 06:02:03,227 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316851123] [2019-11-24 06:02:03,228 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-24 06:02:03,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:03,305 INFO L255 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-24 06:02:03,307 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:03,336 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 118 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:03,336 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:03,345 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,354 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,355 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,383 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,394 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,417 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-24 06:02:03,418 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1051022639] [2019-11-24 06:02:03,463 INFO L159 IcfgInterpreter]: Started Sifa with 38 locations of interest [2019-11-24 06:02:03,463 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:02:03,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:02:03,477 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:02:03,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:02:04,123 WARN L192 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 239 [2019-11-24 06:02:04,363 WARN L192 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 238 [2019-11-24 06:02:04,628 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 241 [2019-11-24 06:02:04,831 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 241 [2019-11-24 06:02:04,940 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 241 [2019-11-24 06:02:05,054 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 241 [2019-11-24 06:02:05,325 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 259 [2019-11-24 06:02:05,595 WARN L192 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 260 [2019-11-24 06:02:05,784 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 271 DAG size of output: 260 [2019-11-24 06:02:05,911 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 271 DAG size of output: 260 [2019-11-24 06:02:06,034 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 258 [2019-11-24 06:02:06,165 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2019-11-24 06:02:06,548 WARN L192 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 289 DAG size of output: 289 [2019-11-24 06:02:06,691 WARN L192 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 289 DAG size of output: 289 [2019-11-24 06:02:06,866 WARN L192 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 289 [2019-11-24 06:02:07,650 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 287 [2019-11-24 06:02:07,817 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 271 [2019-11-24 06:02:07,949 WARN L192 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 271 [2019-11-24 06:02:08,058 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 271 [2019-11-24 06:02:08,347 WARN L192 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 271 [2019-11-24 06:02:08,491 WARN L192 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 287 DAG size of output: 287 [2019-11-24 06:02:09,596 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 264 DAG size of output: 264 [2019-11-24 06:02:09,707 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 264 DAG size of output: 264 [2019-11-24 06:02:10,116 WARN L192 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:10,459 WARN L192 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:10,810 WARN L192 SmtUtils]: Spent 347.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2019-11-24 06:02:11,013 WARN L192 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 305 [2019-11-24 06:02:11,139 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 305 [2019-11-24 06:02:11,270 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 305 [2019-11-24 06:02:11,396 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 305 [2019-11-24 06:02:11,522 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 305 [2019-11-24 06:02:11,666 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 305 [2019-11-24 06:02:11,862 WARN L192 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 313 DAG size of output: 313 [2019-11-24 06:02:11,986 WARN L192 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 313 DAG size of output: 313 [2019-11-24 06:02:12,106 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 313 [2019-11-24 06:02:12,240 WARN L192 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:12,374 WARN L192 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:12,490 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2019-11-24 06:02:12,604 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:12,791 WARN L192 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:12,899 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2019-11-24 06:02:13,013 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:13,132 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 280 DAG size of output: 280 [2019-11-24 06:02:13,245 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2019-11-24 06:02:13,795 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:02:19,027 WARN L192 SmtUtils]: Spent 5.07 s on a formula simplification. DAG size of input: 311 DAG size of output: 244 [2019-11-24 06:02:24,073 WARN L192 SmtUtils]: Spent 4.90 s on a formula simplification. DAG size of input: 278 DAG size of output: 238 [2019-11-24 06:02:24,765 WARN L192 SmtUtils]: Spent 629.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 150 [2019-11-24 06:02:25,801 WARN L192 SmtUtils]: Spent 951.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 156 [2019-11-24 06:02:26,892 WARN L192 SmtUtils]: Spent 971.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 158 [2019-11-24 06:02:28,125 WARN L192 SmtUtils]: Spent 1.04 s on a formula simplification. DAG size of input: 177 DAG size of output: 160 [2019-11-24 06:02:32,919 WARN L192 SmtUtils]: Spent 4.64 s on a formula simplification. DAG size of input: 303 DAG size of output: 238 [2019-11-24 06:02:37,750 WARN L192 SmtUtils]: Spent 4.65 s on a formula simplification. DAG size of input: 304 DAG size of output: 239 [2019-11-24 06:02:42,160 WARN L192 SmtUtils]: Spent 4.21 s on a formula simplification. DAG size of input: 281 DAG size of output: 225 [2019-11-24 06:02:44,541 WARN L192 SmtUtils]: Spent 1.33 s on a formula simplification. DAG size of input: 292 DAG size of output: 170 [2019-11-24 06:02:46,042 WARN L192 SmtUtils]: Spent 1.33 s on a formula simplification. DAG size of input: 282 DAG size of output: 175 [2019-11-24 06:02:50,968 WARN L192 SmtUtils]: Spent 3.90 s on a formula simplification. DAG size of input: 293 DAG size of output: 218 [2019-11-24 06:02:52,796 WARN L192 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 296 DAG size of output: 172 [2019-11-24 06:02:54,345 WARN L192 SmtUtils]: Spent 1.35 s on a formula simplification. DAG size of input: 295 DAG size of output: 179 [2019-11-24 06:03:00,306 WARN L192 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 297 DAG size of output: 212 [2019-11-24 06:03:02,142 WARN L192 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 257 DAG size of output: 174 [2019-11-24 06:03:03,727 WARN L192 SmtUtils]: Spent 1.37 s on a formula simplification. DAG size of input: 259 DAG size of output: 176 [2019-11-24 06:03:05,190 WARN L192 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 269 DAG size of output: 181 [2019-11-24 06:03:06,732 WARN L192 SmtUtils]: Spent 1.33 s on a formula simplification. DAG size of input: 270 DAG size of output: 180 [2019-11-24 06:03:12,992 WARN L192 SmtUtils]: Spent 4.67 s on a formula simplification. DAG size of input: 301 DAG size of output: 208 [2019-11-24 06:03:15,049 WARN L192 SmtUtils]: Spent 1.46 s on a formula simplification. DAG size of input: 304 DAG size of output: 183 [2019-11-24 06:03:16,816 WARN L192 SmtUtils]: Spent 1.48 s on a formula simplification. DAG size of input: 303 DAG size of output: 185 [2019-11-24 06:03:18,216 WARN L192 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 235 DAG size of output: 180 [2019-11-24 06:03:23,635 WARN L192 SmtUtils]: Spent 3.50 s on a formula simplification. DAG size of input: 305 DAG size of output: 202 [2019-11-24 06:03:25,843 WARN L192 SmtUtils]: Spent 1.52 s on a formula simplification. DAG size of input: 308 DAG size of output: 185 [2019-11-24 06:03:27,679 WARN L192 SmtUtils]: Spent 1.52 s on a formula simplification. DAG size of input: 303 DAG size of output: 188 [2019-11-24 06:03:27,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:03:27,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [6, 6, 3] total 34 [2019-11-24 06:03:27,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722779258] [2019-11-24 06:03:27,683 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-24 06:03:27,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:03:27,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-24 06:03:27,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1007, Unknown=0, NotChecked=0, Total=1190 [2019-11-24 06:03:27,684 INFO L87 Difference]: Start difference. First operand 406 states and 550 transitions. Second operand 28 states. [2019-11-24 06:03:32,803 WARN L192 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 242 DAG size of output: 185