/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/psyco/psyco_abp_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 05:39:19,785 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 05:39:19,788 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 05:39:19,800 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-24 05:39:19,860 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 05:39:19,879 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 05:39:19,880 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 05:39:19,880 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 05:39:19,881 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 05:39:19,881 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 05:39:19,881 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 05:39:19,881 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 05:39:19,881 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 05:39:19,882 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 05:39:19,882 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 05:39:19,882 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 05:39:19,882 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 05:39:19,882 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 05:39:19,883 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 05:39:19,883 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 05:39:19,884 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 05:39:19,884 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 05:39:19,884 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 05:39:19,884 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 05:39:19,884 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 05:39:19,885 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 05:39:19,885 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 05:39:19,885 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 05:39:19,885 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 05:39:19,885 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 05:39:19,885 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 05:39:19,886 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 05:39:19,886 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 05:39:19,886 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 05:39:19,886 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 05:39:19,887 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 05:39:19,887 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 05:39:19,887 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 05:39:19,887 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 05:39:19,887 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 05:39:19,888 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 05:39:19,888 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 05:39:19,888 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 05:39:20,216 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 05:39:20,241 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 05:39:20,245 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 05:39:20,246 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 05:39:20,247 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 05:39:20,247 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/psyco/psyco_abp_1-1.c [2019-11-24 05:39:20,321 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ddf49dff/64079e2235484c97a20801ec74260fa6/FLAG0b3fc5084 [2019-11-24 05:39:20,820 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 05:39:20,821 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/psyco/psyco_abp_1-1.c [2019-11-24 05:39:20,837 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ddf49dff/64079e2235484c97a20801ec74260fa6/FLAG0b3fc5084 [2019-11-24 05:39:21,132 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ddf49dff/64079e2235484c97a20801ec74260fa6 [2019-11-24 05:39:21,142 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 05:39:21,144 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 05:39:21,145 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 05:39:21,146 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 05:39:21,150 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 05:39:21,151 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,154 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a08c9d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21, skipping insertion in model container [2019-11-24 05:39:21,154 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,162 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 05:39:21,213 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 05:39:21,529 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 05:39:21,535 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 05:39:21,715 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 05:39:21,736 INFO L208 MainTranslator]: Completed translation [2019-11-24 05:39:21,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21 WrapperNode [2019-11-24 05:39:21,737 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 05:39:21,738 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 05:39:21,738 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 05:39:21,738 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 05:39:21,745 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,756 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,811 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 05:39:21,812 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 05:39:21,812 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 05:39:21,812 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 05:39:21,823 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,827 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,828 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,842 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,852 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,858 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (1/1) ... [2019-11-24 05:39:21,866 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 05:39:21,867 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 05:39:21,867 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 05:39:21,867 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 05:39:21,868 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (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 05:39:21,946 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 05:39:21,946 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 05:39:22,864 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 05:39:22,865 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-11-24 05:39:22,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 05:39:22 BoogieIcfgContainer [2019-11-24 05:39:22,867 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 05:39:22,868 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 05:39:22,868 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 05:39:22,871 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 05:39:22,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 05:39:21" (1/3) ... [2019-11-24 05:39:22,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55a1754d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 05:39:22, skipping insertion in model container [2019-11-24 05:39:22,873 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 05:39:21" (2/3) ... [2019-11-24 05:39:22,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55a1754d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 05:39:22, skipping insertion in model container [2019-11-24 05:39:22,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 05:39:22" (3/3) ... [2019-11-24 05:39:22,875 INFO L109 eAbstractionObserver]: Analyzing ICFG psyco_abp_1-1.c [2019-11-24 05:39:22,886 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 05:39:22,894 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 05:39:22,906 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 05:39:22,935 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 05:39:22,935 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 05:39:22,935 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 05:39:22,936 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 05:39:22,936 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 05:39:22,936 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 05:39:22,936 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 05:39:22,937 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 05:39:22,957 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states. [2019-11-24 05:39:22,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-24 05:39:22,964 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:22,965 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:22,966 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:22,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:22,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1655152119, now seen corresponding path program 1 times [2019-11-24 05:39:22,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:22,983 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451149548] [2019-11-24 05:39:22,984 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:23,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:23,128 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 05:39:23,129 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451149548] [2019-11-24 05:39:23,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:39:23,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 05:39:23,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905064109] [2019-11-24 05:39:23,139 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-24 05:39:23,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:23,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-24 05:39:23,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 05:39:23,159 INFO L87 Difference]: Start difference. First operand 107 states. Second operand 2 states. [2019-11-24 05:39:23,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:23,196 INFO L93 Difference]: Finished difference Result 213 states and 413 transitions. [2019-11-24 05:39:23,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-24 05:39:23,197 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2019-11-24 05:39:23,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:23,213 INFO L225 Difference]: With dead ends: 213 [2019-11-24 05:39:23,213 INFO L226 Difference]: Without dead ends: 104 [2019-11-24 05:39:23,218 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 05:39:23,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-11-24 05:39:23,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2019-11-24 05:39:23,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-24 05:39:23,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 174 transitions. [2019-11-24 05:39:23,273 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 174 transitions. Word has length 8 [2019-11-24 05:39:23,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:23,273 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 174 transitions. [2019-11-24 05:39:23,274 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-24 05:39:23,274 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 174 transitions. [2019-11-24 05:39:23,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-24 05:39:23,275 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:23,275 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:23,275 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:23,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:23,276 INFO L82 PathProgramCache]: Analyzing trace with hash 762379355, now seen corresponding path program 1 times [2019-11-24 05:39:23,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:23,277 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36265146] [2019-11-24 05:39:23,277 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:23,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:23,353 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 05:39:23,374 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36265146] [2019-11-24 05:39:23,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:39:23,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 05:39:23,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272101844] [2019-11-24 05:39:23,380 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 05:39:23,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:23,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 05:39:23,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 05:39:23,381 INFO L87 Difference]: Start difference. First operand 104 states and 174 transitions. Second operand 3 states. [2019-11-24 05:39:23,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:23,476 INFO L93 Difference]: Finished difference Result 210 states and 351 transitions. [2019-11-24 05:39:23,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 05:39:23,477 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-24 05:39:23,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:23,478 INFO L225 Difference]: With dead ends: 210 [2019-11-24 05:39:23,479 INFO L226 Difference]: Without dead ends: 107 [2019-11-24 05:39:23,480 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 05:39:23,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2019-11-24 05:39:23,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2019-11-24 05:39:23,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2019-11-24 05:39:23,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 177 transitions. [2019-11-24 05:39:23,499 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 177 transitions. Word has length 9 [2019-11-24 05:39:23,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:23,500 INFO L462 AbstractCegarLoop]: Abstraction has 107 states and 177 transitions. [2019-11-24 05:39:23,500 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 05:39:23,500 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 177 transitions. [2019-11-24 05:39:23,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-24 05:39:23,501 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:23,501 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:23,501 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:23,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:23,503 INFO L82 PathProgramCache]: Analyzing trace with hash -197013714, now seen corresponding path program 1 times [2019-11-24 05:39:23,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:23,503 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653879492] [2019-11-24 05:39:23,504 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:23,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:23,882 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 23 [2019-11-24 05:39:23,890 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 05:39:23,890 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653879492] [2019-11-24 05:39:23,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:39:23,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 05:39:23,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356266940] [2019-11-24 05:39:23,892 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 05:39:23,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:23,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 05:39:23,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-24 05:39:23,894 INFO L87 Difference]: Start difference. First operand 107 states and 177 transitions. Second operand 4 states. [2019-11-24 05:39:24,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:24,234 INFO L93 Difference]: Finished difference Result 214 states and 353 transitions. [2019-11-24 05:39:24,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 05:39:24,235 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2019-11-24 05:39:24,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:24,237 INFO L225 Difference]: With dead ends: 214 [2019-11-24 05:39:24,237 INFO L226 Difference]: Without dead ends: 190 [2019-11-24 05:39:24,238 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-24 05:39:24,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2019-11-24 05:39:24,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 176. [2019-11-24 05:39:24,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2019-11-24 05:39:24,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 290 transitions. [2019-11-24 05:39:24,252 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 290 transitions. Word has length 14 [2019-11-24 05:39:24,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:24,252 INFO L462 AbstractCegarLoop]: Abstraction has 176 states and 290 transitions. [2019-11-24 05:39:24,252 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 05:39:24,253 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 290 transitions. [2019-11-24 05:39:24,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-24 05:39:24,254 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:24,255 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:24,255 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:24,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:24,256 INFO L82 PathProgramCache]: Analyzing trace with hash 938789430, now seen corresponding path program 1 times [2019-11-24 05:39:24,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:24,257 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105294829] [2019-11-24 05:39:24,257 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:24,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:24,305 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 05:39:24,306 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105294829] [2019-11-24 05:39:24,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:39:24,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 05:39:24,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104420346] [2019-11-24 05:39:24,307 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 05:39:24,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:24,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 05:39:24,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 05:39:24,308 INFO L87 Difference]: Start difference. First operand 176 states and 290 transitions. Second operand 3 states. [2019-11-24 05:39:24,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:24,341 INFO L93 Difference]: Finished difference Result 302 states and 496 transitions. [2019-11-24 05:39:24,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 05:39:24,341 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-24 05:39:24,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:24,343 INFO L225 Difference]: With dead ends: 302 [2019-11-24 05:39:24,343 INFO L226 Difference]: Without dead ends: 128 [2019-11-24 05:39:24,344 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 05:39:24,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-11-24 05:39:24,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2019-11-24 05:39:24,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2019-11-24 05:39:24,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 203 transitions. [2019-11-24 05:39:24,353 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 203 transitions. Word has length 15 [2019-11-24 05:39:24,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:24,354 INFO L462 AbstractCegarLoop]: Abstraction has 126 states and 203 transitions. [2019-11-24 05:39:24,354 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 05:39:24,354 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 203 transitions. [2019-11-24 05:39:24,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-24 05:39:24,355 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:24,355 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:24,356 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:24,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:24,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1693191315, now seen corresponding path program 1 times [2019-11-24 05:39:24,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:24,357 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544842537] [2019-11-24 05:39:24,357 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:24,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:24,413 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 05:39:24,414 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544842537] [2019-11-24 05:39:24,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:39:24,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 05:39:24,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958215918] [2019-11-24 05:39:24,415 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 05:39:24,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:24,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 05:39:24,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 05:39:24,416 INFO L87 Difference]: Start difference. First operand 126 states and 203 transitions. Second operand 3 states. [2019-11-24 05:39:24,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:24,446 INFO L93 Difference]: Finished difference Result 234 states and 375 transitions. [2019-11-24 05:39:24,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 05:39:24,447 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-24 05:39:24,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:24,448 INFO L225 Difference]: With dead ends: 234 [2019-11-24 05:39:24,448 INFO L226 Difference]: Without dead ends: 110 [2019-11-24 05:39:24,449 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 05:39:24,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-11-24 05:39:24,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2019-11-24 05:39:24,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2019-11-24 05:39:24,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 170 transitions. [2019-11-24 05:39:24,455 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 170 transitions. Word has length 20 [2019-11-24 05:39:24,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:24,455 INFO L462 AbstractCegarLoop]: Abstraction has 108 states and 170 transitions. [2019-11-24 05:39:24,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 05:39:24,456 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 170 transitions. [2019-11-24 05:39:24,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-24 05:39:24,457 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:24,457 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:24,457 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:24,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:24,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1475234708, now seen corresponding path program 1 times [2019-11-24 05:39:24,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:24,458 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71370211] [2019-11-24 05:39:24,458 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:24,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:24,504 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:24,505 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71370211] [2019-11-24 05:39:24,505 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007479964] [2019-11-24 05:39:24,505 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 05:39:24,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:24,579 INFO L255 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 05:39:24,587 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:24,624 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:24,625 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:24,642 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:24,643 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392114002] [2019-11-24 05:39:24,670 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-24 05:39:24,670 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:24,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:24,684 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:24,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:25,596 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:26,364 WARN L192 SmtUtils]: Spent 718.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 85 [2019-11-24 05:39:26,807 WARN L192 SmtUtils]: Spent 419.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 83 [2019-11-24 05:39:27,117 WARN L192 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 73 [2019-11-24 05:39:27,348 WARN L192 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 69 [2019-11-24 05:39:27,614 WARN L192 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 70 [2019-11-24 05:39:28,095 WARN L192 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 79 [2019-11-24 05:39:28,444 WARN L192 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 81 [2019-11-24 05:39:28,734 WARN L192 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 73 [2019-11-24 05:39:29,117 WARN L192 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 79 [2019-11-24 05:39:29,473 WARN L192 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 73 [2019-11-24 05:39:29,904 WARN L192 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 81 [2019-11-24 05:39:30,387 WARN L192 SmtUtils]: Spent 350.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 79 [2019-11-24 05:39:30,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:39:30,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [4, 4, 4] total 18 [2019-11-24 05:39:30,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073640794] [2019-11-24 05:39:30,391 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-24 05:39:30,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:30,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-24 05:39:30,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2019-11-24 05:39:30,393 INFO L87 Difference]: Start difference. First operand 108 states and 170 transitions. Second operand 15 states. [2019-11-24 05:39:31,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:31,548 INFO L93 Difference]: Finished difference Result 213 states and 342 transitions. [2019-11-24 05:39:31,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-24 05:39:31,549 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2019-11-24 05:39:31,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:31,550 INFO L225 Difference]: With dead ends: 213 [2019-11-24 05:39:31,550 INFO L226 Difference]: Without dead ends: 127 [2019-11-24 05:39:31,551 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2019-11-24 05:39:31,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2019-11-24 05:39:31,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2019-11-24 05:39:31,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-24 05:39:31,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 198 transitions. [2019-11-24 05:39:31,572 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 198 transitions. Word has length 22 [2019-11-24 05:39:31,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:31,572 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 198 transitions. [2019-11-24 05:39:31,572 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-24 05:39:31,572 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 198 transitions. [2019-11-24 05:39:31,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-24 05:39:31,576 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:31,576 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:31,777 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:31,778 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:31,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:31,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1500920786, now seen corresponding path program 1 times [2019-11-24 05:39:31,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:31,778 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161978953] [2019-11-24 05:39:31,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:31,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:31,910 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:31,910 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161978953] [2019-11-24 05:39:31,910 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97754012] [2019-11-24 05:39:31,911 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 05:39:31,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:31,972 INFO L255 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-24 05:39:31,974 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:31,998 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:31,998 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:32,098 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:32,099 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746970365] [2019-11-24 05:39:32,101 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-24 05:39:32,101 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:32,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:32,102 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:32,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:32,639 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:33,396 WARN L192 SmtUtils]: Spent 693.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 87 [2019-11-24 05:39:33,769 WARN L192 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 80 [2019-11-24 05:39:34,019 WARN L192 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2019-11-24 05:39:34,253 WARN L192 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 68 [2019-11-24 05:39:34,530 WARN L192 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 71 [2019-11-24 05:39:34,958 WARN L192 SmtUtils]: Spent 382.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 77 [2019-11-24 05:39:35,222 WARN L192 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 75 [2019-11-24 05:39:35,482 WARN L192 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 71 [2019-11-24 05:39:35,779 WARN L192 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 74 [2019-11-24 05:39:36,105 WARN L192 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 71 [2019-11-24 05:39:36,476 WARN L192 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 75 [2019-11-24 05:39:36,768 WARN L192 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 75 [2019-11-24 05:39:37,109 WARN L192 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 70 [2019-11-24 05:39:37,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:39:37,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [5, 4, 6] total 24 [2019-11-24 05:39:37,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636340098] [2019-11-24 05:39:37,113 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-24 05:39:37,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:37,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-24 05:39:37,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2019-11-24 05:39:37,114 INFO L87 Difference]: Start difference. First operand 125 states and 198 transitions. Second operand 16 states. [2019-11-24 05:39:37,669 WARN L192 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 77 [2019-11-24 05:39:38,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:38,751 INFO L93 Difference]: Finished difference Result 130 states and 203 transitions. [2019-11-24 05:39:38,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-24 05:39:38,751 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2019-11-24 05:39:38,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:38,753 INFO L225 Difference]: With dead ends: 130 [2019-11-24 05:39:38,753 INFO L226 Difference]: Without dead ends: 128 [2019-11-24 05:39:38,754 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2019-11-24 05:39:38,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-11-24 05:39:38,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2019-11-24 05:39:38,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2019-11-24 05:39:38,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 199 transitions. [2019-11-24 05:39:38,761 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 199 transitions. Word has length 23 [2019-11-24 05:39:38,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:38,761 INFO L462 AbstractCegarLoop]: Abstraction has 126 states and 199 transitions. [2019-11-24 05:39:38,761 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-24 05:39:38,762 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 199 transitions. [2019-11-24 05:39:38,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-24 05:39:38,762 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:38,762 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:38,965 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:38,966 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:38,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:38,967 INFO L82 PathProgramCache]: Analyzing trace with hash 728494181, now seen corresponding path program 1 times [2019-11-24 05:39:38,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:38,968 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387531366] [2019-11-24 05:39:38,968 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:38,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:39,001 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:39,001 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387531366] [2019-11-24 05:39:39,002 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237278526] [2019-11-24 05:39:39,002 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 05:39:39,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:39,057 INFO L255 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 05:39:39,059 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:39,066 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:39,066 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:39,076 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:39,076 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335106851] [2019-11-24 05:39:39,078 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2019-11-24 05:39:39,078 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:39,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:39,079 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:39,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:39,625 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:40,376 WARN L192 SmtUtils]: Spent 703.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 87 [2019-11-24 05:39:40,688 WARN L192 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 78 [2019-11-24 05:39:40,933 WARN L192 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 72 [2019-11-24 05:39:41,160 WARN L192 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 68 [2019-11-24 05:39:41,403 WARN L192 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 70 [2019-11-24 05:39:41,838 WARN L192 SmtUtils]: Spent 390.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 76 [2019-11-24 05:39:42,098 WARN L192 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 74 [2019-11-24 05:39:42,348 WARN L192 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 70 [2019-11-24 05:39:42,600 WARN L192 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 72 [2019-11-24 05:39:42,923 WARN L192 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 70 [2019-11-24 05:39:43,270 WARN L192 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 74 [2019-11-24 05:39:43,582 WARN L192 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 74 [2019-11-24 05:39:43,876 WARN L192 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 74 [2019-11-24 05:39:44,085 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2019-11-24 05:39:44,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:39:44,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [4, 4, 4] total 20 [2019-11-24 05:39:44,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297103166] [2019-11-24 05:39:44,089 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-24 05:39:44,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:44,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-24 05:39:44,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2019-11-24 05:39:44,090 INFO L87 Difference]: Start difference. First operand 126 states and 199 transitions. Second operand 17 states. [2019-11-24 05:39:44,606 WARN L192 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 77 [2019-11-24 05:39:45,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:45,468 INFO L93 Difference]: Finished difference Result 131 states and 203 transitions. [2019-11-24 05:39:45,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-24 05:39:45,469 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2019-11-24 05:39:45,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:45,470 INFO L225 Difference]: With dead ends: 131 [2019-11-24 05:39:45,470 INFO L226 Difference]: Without dead ends: 128 [2019-11-24 05:39:45,470 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2019-11-24 05:39:45,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2019-11-24 05:39:45,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2019-11-24 05:39:45,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2019-11-24 05:39:45,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 198 transitions. [2019-11-24 05:39:45,479 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 198 transitions. Word has length 24 [2019-11-24 05:39:45,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:45,479 INFO L462 AbstractCegarLoop]: Abstraction has 126 states and 198 transitions. [2019-11-24 05:39:45,479 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-24 05:39:45,479 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 198 transitions. [2019-11-24 05:39:45,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-24 05:39:45,481 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:45,481 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:45,691 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:45,692 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:45,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:45,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1119927614, now seen corresponding path program 1 times [2019-11-24 05:39:45,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:45,693 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209382383] [2019-11-24 05:39:45,694 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:45,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:45,727 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:45,728 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209382383] [2019-11-24 05:39:45,728 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234296070] [2019-11-24 05:39:45,728 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:45,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:45,786 INFO L255 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 05:39:45,787 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:45,797 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:45,797 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:45,809 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:45,809 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2065700698] [2019-11-24 05:39:45,811 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-11-24 05:39:45,812 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:45,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:45,813 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:45,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:46,064 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:46,308 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 44 [2019-11-24 05:39:46,632 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 05:39:46,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:39:46,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2019-11-24 05:39:46,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63019138] [2019-11-24 05:39:46,633 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 05:39:46,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:46,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 05:39:46,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2019-11-24 05:39:46,634 INFO L87 Difference]: Start difference. First operand 126 states and 198 transitions. Second operand 5 states. [2019-11-24 05:39:46,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:46,802 INFO L93 Difference]: Finished difference Result 215 states and 339 transitions. [2019-11-24 05:39:46,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 05:39:46,803 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2019-11-24 05:39:46,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:46,804 INFO L225 Difference]: With dead ends: 215 [2019-11-24 05:39:46,811 INFO L226 Difference]: Without dead ends: 203 [2019-11-24 05:39:46,812 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2019-11-24 05:39:46,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2019-11-24 05:39:46,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 189. [2019-11-24 05:39:46,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2019-11-24 05:39:46,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 305 transitions. [2019-11-24 05:39:46,826 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 305 transitions. Word has length 25 [2019-11-24 05:39:46,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:46,826 INFO L462 AbstractCegarLoop]: Abstraction has 189 states and 305 transitions. [2019-11-24 05:39:46,826 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 05:39:46,829 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 305 transitions. [2019-11-24 05:39:46,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-24 05:39:46,830 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:46,830 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:47,038 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:47,038 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:47,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:47,038 INFO L82 PathProgramCache]: Analyzing trace with hash 369462614, now seen corresponding path program 1 times [2019-11-24 05:39:47,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:47,039 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272283431] [2019-11-24 05:39:47,039 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:47,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:47,102 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:47,102 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272283431] [2019-11-24 05:39:47,102 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871062988] [2019-11-24 05:39:47,103 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:47,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:47,162 INFO L255 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-24 05:39:47,164 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:47,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:47,177 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:47,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:47,269 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [397398430] [2019-11-24 05:39:47,270 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2019-11-24 05:39:47,271 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:47,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:47,273 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:47,273 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:47,681 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:48,415 WARN L192 SmtUtils]: Spent 685.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 87 [2019-11-24 05:39:48,912 WARN L192 SmtUtils]: Spent 472.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 83 [2019-11-24 05:39:49,187 WARN L192 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 73 [2019-11-24 05:39:49,469 WARN L192 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 69 [2019-11-24 05:39:49,775 WARN L192 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 73 [2019-11-24 05:39:50,249 WARN L192 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 79 [2019-11-24 05:39:50,538 WARN L192 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 77 [2019-11-24 05:39:50,812 WARN L192 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 73 [2019-11-24 05:39:51,154 WARN L192 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 79 [2019-11-24 05:39:51,503 WARN L192 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 73 [2019-11-24 05:39:51,908 WARN L192 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 81 [2019-11-24 05:39:52,264 WARN L192 SmtUtils]: Spent 305.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 81 [2019-11-24 05:39:52,623 WARN L192 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 81 [2019-11-24 05:39:52,996 WARN L192 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 81 [2019-11-24 05:39:53,373 WARN L192 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 81 [2019-11-24 05:39:53,792 WARN L192 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 81 [2019-11-24 05:39:53,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:39:53,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [5, 4, 6] total 26 [2019-11-24 05:39:53,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991628830] [2019-11-24 05:39:53,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-24 05:39:53,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:53,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-24 05:39:53,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=486, Unknown=0, NotChecked=0, Total=650 [2019-11-24 05:39:53,796 INFO L87 Difference]: Start difference. First operand 189 states and 305 transitions. Second operand 19 states. [2019-11-24 05:39:54,334 WARN L192 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 77 [2019-11-24 05:39:55,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:55,325 INFO L93 Difference]: Finished difference Result 194 states and 309 transitions. [2019-11-24 05:39:55,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-24 05:39:55,326 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2019-11-24 05:39:55,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:55,328 INFO L225 Difference]: With dead ends: 194 [2019-11-24 05:39:55,328 INFO L226 Difference]: Without dead ends: 191 [2019-11-24 05:39:55,329 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=176, Invalid=526, Unknown=0, NotChecked=0, Total=702 [2019-11-24 05:39:55,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2019-11-24 05:39:55,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 189. [2019-11-24 05:39:55,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2019-11-24 05:39:55,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 304 transitions. [2019-11-24 05:39:55,336 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 304 transitions. Word has length 26 [2019-11-24 05:39:55,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:55,336 INFO L462 AbstractCegarLoop]: Abstraction has 189 states and 304 transitions. [2019-11-24 05:39:55,336 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-24 05:39:55,336 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 304 transitions. [2019-11-24 05:39:55,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-24 05:39:55,337 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:55,338 INFO L410 BasicCegarLoop]: trace histogram [3, 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 05:39:55,540 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:55,541 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:55,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:55,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1420115441, now seen corresponding path program 1 times [2019-11-24 05:39:55,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:55,543 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411622946] [2019-11-24 05:39:55,543 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:55,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:55,746 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:55,747 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411622946] [2019-11-24 05:39:55,747 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188105153] [2019-11-24 05:39:55,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:55,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:55,799 INFO L255 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-24 05:39:55,801 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:55,830 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:55,831 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:55,889 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:39:55,889 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489393613] [2019-11-24 05:39:55,891 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2019-11-24 05:39:55,891 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:55,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:55,892 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:55,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:56,114 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:56,325 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 44 [2019-11-24 05:39:56,728 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 05:39:56,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:39:56,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 5] total 9 [2019-11-24 05:39:56,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860827794] [2019-11-24 05:39:56,729 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-24 05:39:56,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:56,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-24 05:39:56,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=684, Unknown=0, NotChecked=0, Total=812 [2019-11-24 05:39:56,731 INFO L87 Difference]: Start difference. First operand 189 states and 304 transitions. Second operand 9 states. [2019-11-24 05:39:57,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:57,287 INFO L93 Difference]: Finished difference Result 651 states and 1059 transitions. [2019-11-24 05:39:57,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-24 05:39:57,289 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-11-24 05:39:57,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:57,292 INFO L225 Difference]: With dead ends: 651 [2019-11-24 05:39:57,292 INFO L226 Difference]: Without dead ends: 632 [2019-11-24 05:39:57,293 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 55 SyntacticMatches, 4 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2019-11-24 05:39:57,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2019-11-24 05:39:57,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 563. [2019-11-24 05:39:57,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 563 states. [2019-11-24 05:39:57,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 563 states to 563 states and 946 transitions. [2019-11-24 05:39:57,310 INFO L78 Accepts]: Start accepts. Automaton has 563 states and 946 transitions. Word has length 27 [2019-11-24 05:39:57,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:57,310 INFO L462 AbstractCegarLoop]: Abstraction has 563 states and 946 transitions. [2019-11-24 05:39:57,311 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-24 05:39:57,311 INFO L276 IsEmpty]: Start isEmpty. Operand 563 states and 946 transitions. [2019-11-24 05:39:57,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-24 05:39:57,312 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:57,312 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:39:57,515 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:57,515 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:57,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:57,515 INFO L82 PathProgramCache]: Analyzing trace with hash -580554962, now seen corresponding path program 1 times [2019-11-24 05:39:57,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:57,516 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28690112] [2019-11-24 05:39:57,516 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:57,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:57,551 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-24 05:39:57,551 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28690112] [2019-11-24 05:39:57,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:39:57,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 05:39:57,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812331936] [2019-11-24 05:39:57,552 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 05:39:57,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:39:57,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 05:39:57,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 05:39:57,553 INFO L87 Difference]: Start difference. First operand 563 states and 946 transitions. Second operand 3 states. [2019-11-24 05:39:57,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:39:57,588 INFO L93 Difference]: Finished difference Result 1038 states and 1745 transitions. [2019-11-24 05:39:57,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 05:39:57,588 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 32 [2019-11-24 05:39:57,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:39:57,593 INFO L225 Difference]: With dead ends: 1038 [2019-11-24 05:39:57,593 INFO L226 Difference]: Without dead ends: 516 [2019-11-24 05:39:57,594 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 05:39:57,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2019-11-24 05:39:57,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 514. [2019-11-24 05:39:57,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2019-11-24 05:39:57,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 847 transitions. [2019-11-24 05:39:57,609 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 847 transitions. Word has length 32 [2019-11-24 05:39:57,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:39:57,610 INFO L462 AbstractCegarLoop]: Abstraction has 514 states and 847 transitions. [2019-11-24 05:39:57,610 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 05:39:57,610 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 847 transitions. [2019-11-24 05:39:57,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-24 05:39:57,611 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:39:57,611 INFO L410 BasicCegarLoop]: trace histogram [4, 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] [2019-11-24 05:39:57,611 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:39:57,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:39:57,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1771134383, now seen corresponding path program 1 times [2019-11-24 05:39:57,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:39:57,612 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537616972] [2019-11-24 05:39:57,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:39:57,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:57,685 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 05:39:57,686 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537616972] [2019-11-24 05:39:57,686 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391842665] [2019-11-24 05:39:57,686 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:39:57,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:39:57,745 INFO L255 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-24 05:39:57,747 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:39:57,759 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 05:39:57,759 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:39:57,772 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-24 05:39:57,773 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2041277778] [2019-11-24 05:39:57,774 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2019-11-24 05:39:57,774 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:39:57,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:39:57,775 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:39:57,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:39:58,461 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:39:59,445 WARN L192 SmtUtils]: Spent 939.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 89 [2019-11-24 05:40:00,026 WARN L192 SmtUtils]: Spent 559.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 89 [2019-11-24 05:40:00,350 WARN L192 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 78 [2019-11-24 05:40:00,662 WARN L192 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 74 [2019-11-24 05:40:00,990 WARN L192 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 76 [2019-11-24 05:40:01,612 WARN L192 SmtUtils]: Spent 554.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 86 [2019-11-24 05:40:01,965 WARN L192 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 81 [2019-11-24 05:40:02,299 WARN L192 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 77 [2019-11-24 05:40:02,668 WARN L192 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 79 [2019-11-24 05:40:03,223 WARN L192 SmtUtils]: Spent 513.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 82 [2019-11-24 05:40:03,647 WARN L192 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 81 [2019-11-24 05:40:04,020 WARN L192 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 111 DAG size of output: 81 [2019-11-24 05:40:04,422 WARN L192 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 77 [2019-11-24 05:40:04,779 WARN L192 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 75 [2019-11-24 05:40:05,273 WARN L192 SmtUtils]: Spent 391.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 77 [2019-11-24 05:40:05,667 WARN L192 SmtUtils]: Spent 329.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 81 [2019-11-24 05:40:06,065 WARN L192 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 81 [2019-11-24 05:40:06,521 WARN L192 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 75 [2019-11-24 05:40:06,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:40:06,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [4, 4, 4] total 23 [2019-11-24 05:40:06,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482976311] [2019-11-24 05:40:06,524 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-24 05:40:06,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:40:06,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-24 05:40:06,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2019-11-24 05:40:06,525 INFO L87 Difference]: Start difference. First operand 514 states and 847 transitions. Second operand 21 states. [2019-11-24 05:40:07,108 WARN L192 SmtUtils]: Spent 396.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 78 [2019-11-24 05:40:08,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:40:08,308 INFO L93 Difference]: Finished difference Result 868 states and 1429 transitions. [2019-11-24 05:40:08,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-24 05:40:08,309 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 33 [2019-11-24 05:40:08,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:40:08,312 INFO L225 Difference]: With dead ends: 868 [2019-11-24 05:40:08,313 INFO L226 Difference]: Without dead ends: 394 [2019-11-24 05:40:08,314 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 73 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2019-11-24 05:40:08,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2019-11-24 05:40:08,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 391. [2019-11-24 05:40:08,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2019-11-24 05:40:08,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 632 transitions. [2019-11-24 05:40:08,331 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 632 transitions. Word has length 33 [2019-11-24 05:40:08,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:40:08,332 INFO L462 AbstractCegarLoop]: Abstraction has 391 states and 632 transitions. [2019-11-24 05:40:08,332 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-24 05:40:08,332 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 632 transitions. [2019-11-24 05:40:08,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-24 05:40:08,333 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:40:08,333 INFO L410 BasicCegarLoop]: trace histogram [4, 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] [2019-11-24 05:40:08,536 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:08,536 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:40:08,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:40:08,537 INFO L82 PathProgramCache]: Analyzing trace with hash -886789566, now seen corresponding path program 1 times [2019-11-24 05:40:08,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:40:08,537 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003063653] [2019-11-24 05:40:08,537 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:40:08,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:08,714 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:08,714 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003063653] [2019-11-24 05:40:08,715 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547415523] [2019-11-24 05:40:08,715 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:08,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:08,773 INFO L255 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-24 05:40:08,774 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:40:08,802 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:08,803 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:40:09,043 WARN L192 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 21 [2019-11-24 05:40:09,233 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:09,234 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533847651] [2019-11-24 05:40:09,237 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2019-11-24 05:40:09,237 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:40:09,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:40:09,238 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:40:09,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:40:10,294 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:40:11,147 WARN L192 SmtUtils]: Spent 788.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 91 [2019-11-24 05:40:12,006 WARN L192 SmtUtils]: Spent 825.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 87 [2019-11-24 05:40:12,290 WARN L192 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 71 [2019-11-24 05:40:13,537 WARN L192 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 98 DAG size of output: 85 [2019-11-24 05:40:13,835 WARN L192 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 73 [2019-11-24 05:40:14,027 WARN L192 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 69 [2019-11-24 05:40:14,251 WARN L192 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 71 [2019-11-24 05:40:14,757 WARN L192 SmtUtils]: Spent 453.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 78 [2019-11-24 05:40:15,208 WARN L192 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 80 [2019-11-24 05:40:15,605 WARN L192 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 80 [2019-11-24 05:40:15,993 WARN L192 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 76 [2019-11-24 05:40:16,354 WARN L192 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 74 [2019-11-24 05:40:16,802 WARN L192 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 76 [2019-11-24 05:40:17,208 WARN L192 SmtUtils]: Spent 333.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 80 [2019-11-24 05:40:17,615 WARN L192 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 80 [2019-11-24 05:40:18,027 WARN L192 SmtUtils]: Spent 328.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 80 [2019-11-24 05:40:18,457 WARN L192 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 80 [2019-11-24 05:40:18,708 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2019-11-24 05:40:18,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:40:18,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [5, 5, 6] total 30 [2019-11-24 05:40:18,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106966461] [2019-11-24 05:40:18,710 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-24 05:40:18,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:40:18,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-24 05:40:18,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=724, Unknown=0, NotChecked=0, Total=870 [2019-11-24 05:40:18,712 INFO L87 Difference]: Start difference. First operand 391 states and 632 transitions. Second operand 23 states. [2019-11-24 05:40:19,266 WARN L192 SmtUtils]: Spent 348.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 75 [2019-11-24 05:40:19,903 WARN L192 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 71 [2019-11-24 05:40:21,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:40:21,352 INFO L93 Difference]: Finished difference Result 396 states and 636 transitions. [2019-11-24 05:40:21,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-24 05:40:21,352 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 35 [2019-11-24 05:40:21,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:40:21,355 INFO L225 Difference]: With dead ends: 396 [2019-11-24 05:40:21,355 INFO L226 Difference]: Without dead ends: 394 [2019-11-24 05:40:21,356 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 71 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=165, Invalid=827, Unknown=0, NotChecked=0, Total=992 [2019-11-24 05:40:21,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2019-11-24 05:40:21,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 391. [2019-11-24 05:40:21,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2019-11-24 05:40:21,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 631 transitions. [2019-11-24 05:40:21,376 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 631 transitions. Word has length 35 [2019-11-24 05:40:21,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:40:21,378 INFO L462 AbstractCegarLoop]: Abstraction has 391 states and 631 transitions. [2019-11-24 05:40:21,378 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-24 05:40:21,379 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 631 transitions. [2019-11-24 05:40:21,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-24 05:40:21,379 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:40:21,380 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 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, 1, 1] [2019-11-24 05:40:21,585 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:21,586 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:40:21,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:40:21,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1560280933, now seen corresponding path program 1 times [2019-11-24 05:40:21,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:40:21,587 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688462994] [2019-11-24 05:40:21,587 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:40:21,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2019-11-24 05:40:21,621 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688462994] [2019-11-24 05:40:21,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 05:40:21,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 05:40:21,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826394333] [2019-11-24 05:40:21,621 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 05:40:21,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:40:21,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 05:40:21,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 05:40:21,622 INFO L87 Difference]: Start difference. First operand 391 states and 631 transitions. Second operand 3 states. [2019-11-24 05:40:21,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:40:21,654 INFO L93 Difference]: Finished difference Result 743 states and 1197 transitions. [2019-11-24 05:40:21,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 05:40:21,655 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 45 [2019-11-24 05:40:21,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:40:21,657 INFO L225 Difference]: With dead ends: 743 [2019-11-24 05:40:21,657 INFO L226 Difference]: Without dead ends: 412 [2019-11-24 05:40:21,660 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 05:40:21,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2019-11-24 05:40:21,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 410. [2019-11-24 05:40:21,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 410 states. [2019-11-24 05:40:21,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 642 transitions. [2019-11-24 05:40:21,672 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 642 transitions. Word has length 45 [2019-11-24 05:40:21,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:40:21,672 INFO L462 AbstractCegarLoop]: Abstraction has 410 states and 642 transitions. [2019-11-24 05:40:21,672 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 05:40:21,672 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 642 transitions. [2019-11-24 05:40:21,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-24 05:40:21,674 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:40:21,674 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 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, 1] [2019-11-24 05:40:21,674 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:40:21,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:40:21,674 INFO L82 PathProgramCache]: Analyzing trace with hash 170271898, now seen corresponding path program 1 times [2019-11-24 05:40:21,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:40:21,675 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285203762] [2019-11-24 05:40:21,675 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:40:21,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:21,808 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 05:40:21,809 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285203762] [2019-11-24 05:40:21,809 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901262584] [2019-11-24 05:40:21,809 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:21,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:21,888 INFO L255 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-24 05:40:21,890 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:40:21,939 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-24 05:40:21,939 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:40:22,085 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 05:40:22,085 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1333930774] [2019-11-24 05:40:22,093 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2019-11-24 05:40:22,094 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:40:22,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:40:22,094 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:40:22,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:40:24,644 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:40:25,126 WARN L192 SmtUtils]: Spent 380.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 71 [2019-11-24 05:40:25,464 WARN L192 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 181 [2019-11-24 05:40:25,828 WARN L192 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 71 [2019-11-24 05:40:26,422 WARN L192 SmtUtils]: Spent 419.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 163 [2019-11-24 05:40:27,557 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-24 05:40:27,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:40:27,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 8] total 12 [2019-11-24 05:40:27,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730112697] [2019-11-24 05:40:27,559 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-24 05:40:27,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:40:27,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-24 05:40:27,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1382, Unknown=0, NotChecked=0, Total=1560 [2019-11-24 05:40:27,560 INFO L87 Difference]: Start difference. First operand 410 states and 642 transitions. Second operand 12 states. [2019-11-24 05:40:28,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:40:28,029 INFO L93 Difference]: Finished difference Result 635 states and 970 transitions. [2019-11-24 05:40:28,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-24 05:40:28,030 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2019-11-24 05:40:28,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:40:28,033 INFO L225 Difference]: With dead ends: 635 [2019-11-24 05:40:28,033 INFO L226 Difference]: Without dead ends: 613 [2019-11-24 05:40:28,034 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 102 SyntacticMatches, 6 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=195, Invalid=1527, Unknown=0, NotChecked=0, Total=1722 [2019-11-24 05:40:28,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2019-11-24 05:40:28,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 568. [2019-11-24 05:40:28,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 568 states. [2019-11-24 05:40:28,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 568 states to 568 states and 880 transitions. [2019-11-24 05:40:28,051 INFO L78 Accepts]: Start accepts. Automaton has 568 states and 880 transitions. Word has length 46 [2019-11-24 05:40:28,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:40:28,052 INFO L462 AbstractCegarLoop]: Abstraction has 568 states and 880 transitions. [2019-11-24 05:40:28,052 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-24 05:40:28,052 INFO L276 IsEmpty]: Start isEmpty. Operand 568 states and 880 transitions. [2019-11-24 05:40:28,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-24 05:40:28,052 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:40:28,053 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 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, 1, 1, 1, 1, 1] [2019-11-24 05:40:28,254 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:28,254 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:40:28,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:40:28,255 INFO L82 PathProgramCache]: Analyzing trace with hash -1676014596, now seen corresponding path program 1 times [2019-11-24 05:40:28,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:40:28,256 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651505411] [2019-11-24 05:40:28,256 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:40:28,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:28,436 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:28,437 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651505411] [2019-11-24 05:40:28,437 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614072875] [2019-11-24 05:40:28,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:28,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:28,512 INFO L255 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-24 05:40:28,513 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:40:28,603 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:28,603 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:40:28,797 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:28,798 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796199956] [2019-11-24 05:40:28,804 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2019-11-24 05:40:28,804 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:40:28,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:40:28,805 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:40:28,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 05:40:30,876 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 05:40:32,064 WARN L192 SmtUtils]: Spent 1.09 s on a formula simplification. DAG size of input: 158 DAG size of output: 107 [2019-11-24 05:40:33,113 WARN L192 SmtUtils]: Spent 962.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 105 [2019-11-24 05:40:33,449 WARN L192 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 71 [2019-11-24 05:40:34,904 WARN L192 SmtUtils]: Spent 1.18 s on a formula simplification. DAG size of input: 110 DAG size of output: 102 [2019-11-24 05:40:35,263 WARN L192 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 74 [2019-11-24 05:40:35,459 WARN L192 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 69 [2019-11-24 05:40:35,687 WARN L192 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 71 [2019-11-24 05:40:36,317 WARN L192 SmtUtils]: Spent 553.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 99 [2019-11-24 05:40:36,748 WARN L192 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 75 [2019-11-24 05:40:37,109 WARN L192 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 75 [2019-11-24 05:40:37,457 WARN L192 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 71 [2019-11-24 05:40:37,761 WARN L192 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 69 [2019-11-24 05:40:38,383 WARN L192 SmtUtils]: Spent 450.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 94 [2019-11-24 05:40:38,793 WARN L192 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 75 [2019-11-24 05:40:39,217 WARN L192 SmtUtils]: Spent 318.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 75 [2019-11-24 05:40:39,634 WARN L192 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 75 [2019-11-24 05:40:40,048 WARN L192 SmtUtils]: Spent 313.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 75 [2019-11-24 05:40:40,421 WARN L192 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 71 [2019-11-24 05:40:40,607 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2019-11-24 05:40:41,078 WARN L192 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 80 [2019-11-24 05:40:41,549 WARN L192 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 84 [2019-11-24 05:40:42,038 WARN L192 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 84 [2019-11-24 05:40:42,519 WARN L192 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 84 [2019-11-24 05:40:43,002 WARN L192 SmtUtils]: Spent 352.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 84 [2019-11-24 05:40:43,506 WARN L192 SmtUtils]: Spent 365.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 84 [2019-11-24 05:40:44,006 WARN L192 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 84 [2019-11-24 05:40:44,671 WARN L192 SmtUtils]: Spent 433.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 77 [2019-11-24 05:40:44,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 05:40:44,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [7, 6, 7] total 45 [2019-11-24 05:40:44,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634405647] [2019-11-24 05:40:44,674 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-24 05:40:44,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 05:40:44,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-24 05:40:44,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=1702, Unknown=0, NotChecked=0, Total=1980 [2019-11-24 05:40:44,676 INFO L87 Difference]: Start difference. First operand 568 states and 880 transitions. Second operand 32 states. [2019-11-24 05:40:45,272 WARN L192 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 72 [2019-11-24 05:40:45,898 WARN L192 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 70 [2019-11-24 05:40:48,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 05:40:48,069 INFO L93 Difference]: Finished difference Result 1078 states and 1680 transitions. [2019-11-24 05:40:48,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-24 05:40:48,073 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 50 [2019-11-24 05:40:48,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 05:40:48,076 INFO L225 Difference]: With dead ends: 1078 [2019-11-24 05:40:48,076 INFO L226 Difference]: Without dead ends: 570 [2019-11-24 05:40:48,080 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 102 SyntacticMatches, 14 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 918 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=301, Invalid=1861, Unknown=0, NotChecked=0, Total=2162 [2019-11-24 05:40:48,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2019-11-24 05:40:48,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 567. [2019-11-24 05:40:48,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 567 states. [2019-11-24 05:40:48,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 877 transitions. [2019-11-24 05:40:48,097 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 877 transitions. Word has length 50 [2019-11-24 05:40:48,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 05:40:48,098 INFO L462 AbstractCegarLoop]: Abstraction has 567 states and 877 transitions. [2019-11-24 05:40:48,098 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-24 05:40:48,098 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 877 transitions. [2019-11-24 05:40:48,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-24 05:40:48,099 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 05:40:48,099 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 05:40:48,302 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:48,302 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 05:40:48,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 05:40:48,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1374353121, now seen corresponding path program 1 times [2019-11-24 05:40:48,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 05:40:48,303 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687862215] [2019-11-24 05:40:48,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 05:40:48,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:48,613 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:48,613 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687862215] [2019-11-24 05:40:48,613 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80215044] [2019-11-24 05:40:48,613 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 05:40:48,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 05:40:48,710 INFO L255 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-24 05:40:48,712 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 05:40:48,821 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:48,821 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 05:40:49,254 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 05:40:49,254 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953454388] [2019-11-24 05:40:49,263 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2019-11-24 05:40:49,263 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 05:40:49,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 05:40:49,265 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 05:40:49,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs