java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/eca-rers2012/Problem16_label34.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:56:01,304 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:56:01,306 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:56:01,319 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:56:01,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:56:01,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:56:01,331 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:56:01,332 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:56:01,333 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:56:01,334 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:56:01,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:56:01,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:56:01,339 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:56:01,341 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:56:01,342 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:56:01,343 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:56:01,345 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:56:01,353 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:56:01,354 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:56:01,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:56:01,355 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 01:56:01,374 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:56:01,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:56:01,376 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:56:01,377 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:56:01,377 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:56:01,378 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:56:01,378 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:56:01,378 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:56:01,378 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:56:01,378 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:56:01,379 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:56:01,380 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:56:01,380 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:56:01,380 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:56:01,381 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:56:01,381 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:56:01,381 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:56:01,381 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:56:01,381 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:56:01,382 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:56:01,382 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:56:01,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:56:01,382 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:56:01,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:56:01,383 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:56:01,383 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:56:01,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:56:01,384 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:56:01,384 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:56:01,686 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:56:01,709 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:56:01,713 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:56:01,714 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:56:01,715 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:56:01,715 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem16_label34.c [2019-10-15 01:56:01,788 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b187c34/a35c3f8912e44adb868e7343509bf461/FLAG2c19dd468 [2019-10-15 01:56:02,418 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:56:02,420 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem16_label34.c [2019-10-15 01:56:02,442 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b187c34/a35c3f8912e44adb868e7343509bf461/FLAG2c19dd468 [2019-10-15 01:56:02,641 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b187c34/a35c3f8912e44adb868e7343509bf461 [2019-10-15 01:56:02,651 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:56:02,653 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:56:02,656 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:56:02,656 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:56:02,659 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:56:02,660 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:56:02" (1/1) ... [2019-10-15 01:56:02,663 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@338e2a78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:02, skipping insertion in model container [2019-10-15 01:56:02,664 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:56:02" (1/1) ... [2019-10-15 01:56:02,672 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:56:02,746 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:56:03,654 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:56:03,663 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:56:04,150 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:56:04,172 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:56:04,172 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04 WrapperNode [2019-10-15 01:56:04,173 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:56:04,174 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:56:04,174 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:56:04,174 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:56:04,190 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,190 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,239 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,239 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,320 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,359 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,380 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (1/1) ... [2019-10-15 01:56:04,393 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:56:04,393 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:56:04,393 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:56:04,394 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:56:04,395 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (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 [2019-10-15 01:56:04,483 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:56:04,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:56:04,484 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 01:56:04,484 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 01:56:04,484 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:56:04,485 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 01:56:04,486 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 01:56:04,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:56:04,487 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:56:04,487 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 01:56:04,487 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:56:04,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:56:04,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:56:27,727 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:56:27,727 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:56:27,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:56:27 BoogieIcfgContainer [2019-10-15 01:56:27,729 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:56:27,730 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:56:27,731 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:56:27,736 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:56:27,737 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:56:02" (1/3) ... [2019-10-15 01:56:27,737 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d093ebb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:56:27, skipping insertion in model container [2019-10-15 01:56:27,738 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:04" (2/3) ... [2019-10-15 01:56:27,738 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d093ebb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:56:27, skipping insertion in model container [2019-10-15 01:56:27,738 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:56:27" (3/3) ... [2019-10-15 01:56:27,740 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem16_label34.c [2019-10-15 01:56:27,750 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:56:27,757 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:56:27,769 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:56:27,798 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:56:27,799 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:56:27,799 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:56:27,799 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:56:27,799 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:56:27,799 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:56:27,799 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:56:27,800 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:56:27,825 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states. [2019-10-15 01:56:27,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 01:56:27,831 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:27,833 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:27,834 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:27,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:27,841 INFO L82 PathProgramCache]: Analyzing trace with hash 863561535, now seen corresponding path program 1 times [2019-10-15 01:56:27,850 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:27,851 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700929424] [2019-10-15 01:56:27,851 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:27,851 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:27,851 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:27,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:28,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:56:28,118 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700929424] [2019-10-15 01:56:28,120 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:28,120 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:56:28,120 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303559804] [2019-10-15 01:56:28,125 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:56:28,126 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:28,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:56:28,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:56:28,144 INFO L87 Difference]: Start difference. First operand 244 states. Second operand 3 states. [2019-10-15 01:56:29,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:29,990 INFO L93 Difference]: Finished difference Result 718 states and 1389 transitions. [2019-10-15 01:56:29,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:56:29,991 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-10-15 01:56:29,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:30,011 INFO L225 Difference]: With dead ends: 718 [2019-10-15 01:56:30,012 INFO L226 Difference]: Without dead ends: 471 [2019-10-15 01:56:30,020 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:56:30,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2019-10-15 01:56:30,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 455. [2019-10-15 01:56:30,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 455 states. [2019-10-15 01:56:30,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 857 transitions. [2019-10-15 01:56:30,115 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 857 transitions. Word has length 11 [2019-10-15 01:56:30,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:30,116 INFO L462 AbstractCegarLoop]: Abstraction has 455 states and 857 transitions. [2019-10-15 01:56:30,116 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:56:30,116 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 857 transitions. [2019-10-15 01:56:30,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:56:30,118 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:30,118 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:30,119 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:30,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:30,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1525267509, now seen corresponding path program 1 times [2019-10-15 01:56:30,119 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:30,120 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590382980] [2019-10-15 01:56:30,120 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:30,120 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:30,121 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:30,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:30,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:56:30,253 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590382980] [2019-10-15 01:56:30,254 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:30,254 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:56:30,254 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3581782] [2019-10-15 01:56:30,256 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:56:30,257 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:30,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:56:30,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:56:30,258 INFO L87 Difference]: Start difference. First operand 455 states and 857 transitions. Second operand 5 states. [2019-10-15 01:56:32,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:32,494 INFO L93 Difference]: Finished difference Result 1369 states and 2614 transitions. [2019-10-15 01:56:32,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:56:32,496 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2019-10-15 01:56:32,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:32,552 INFO L225 Difference]: With dead ends: 1369 [2019-10-15 01:56:32,553 INFO L226 Difference]: Without dead ends: 919 [2019-10-15 01:56:32,555 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-15 01:56:32,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2019-10-15 01:56:32,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 879. [2019-10-15 01:56:32,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 879 states. [2019-10-15 01:56:32,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 879 states to 879 states and 1570 transitions. [2019-10-15 01:56:32,606 INFO L78 Accepts]: Start accepts. Automaton has 879 states and 1570 transitions. Word has length 21 [2019-10-15 01:56:32,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:32,606 INFO L462 AbstractCegarLoop]: Abstraction has 879 states and 1570 transitions. [2019-10-15 01:56:32,606 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:56:32,607 INFO L276 IsEmpty]: Start isEmpty. Operand 879 states and 1570 transitions. [2019-10-15 01:56:32,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-10-15 01:56:32,608 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:32,609 INFO L380 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:32,609 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:32,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:32,609 INFO L82 PathProgramCache]: Analyzing trace with hash -781263902, now seen corresponding path program 1 times [2019-10-15 01:56:32,610 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:32,610 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851278435] [2019-10-15 01:56:32,610 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:32,610 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:32,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:32,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:32,760 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:56:32,760 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851278435] [2019-10-15 01:56:32,761 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:32,761 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:56:32,761 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953118662] [2019-10-15 01:56:32,762 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:56:32,762 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:32,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:56:32,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:32,763 INFO L87 Difference]: Start difference. First operand 879 states and 1570 transitions. Second operand 6 states. [2019-10-15 01:56:34,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:34,962 INFO L93 Difference]: Finished difference Result 2455 states and 4487 transitions. [2019-10-15 01:56:34,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:56:34,963 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 50 [2019-10-15 01:56:34,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:34,974 INFO L225 Difference]: With dead ends: 2455 [2019-10-15 01:56:34,974 INFO L226 Difference]: Without dead ends: 1581 [2019-10-15 01:56:34,977 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:56:34,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1581 states. [2019-10-15 01:56:35,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1581 to 1560. [2019-10-15 01:56:35,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1560 states. [2019-10-15 01:56:35,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1560 states to 1560 states and 2706 transitions. [2019-10-15 01:56:35,061 INFO L78 Accepts]: Start accepts. Automaton has 1560 states and 2706 transitions. Word has length 50 [2019-10-15 01:56:35,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:35,063 INFO L462 AbstractCegarLoop]: Abstraction has 1560 states and 2706 transitions. [2019-10-15 01:56:35,063 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:56:35,063 INFO L276 IsEmpty]: Start isEmpty. Operand 1560 states and 2706 transitions. [2019-10-15 01:56:35,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-15 01:56:35,070 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:35,072 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:35,072 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:35,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:35,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1243057397, now seen corresponding path program 1 times [2019-10-15 01:56:35,073 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:35,073 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581109975] [2019-10-15 01:56:35,073 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:35,073 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:35,073 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:35,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:35,217 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:56:35,217 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581109975] [2019-10-15 01:56:35,218 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1399369525] [2019-10-15 01:56:35,218 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 [2019-10-15 01:56:35,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:35,318 INFO L256 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:56:35,326 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:35,444 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:56:35,445 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:35,546 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:56:35,547 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:56:35,547 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2019-10-15 01:56:35,548 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538594517] [2019-10-15 01:56:35,548 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:56:35,548 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:35,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:56:35,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:56:35,550 INFO L87 Difference]: Start difference. First operand 1560 states and 2706 transitions. Second operand 5 states. [2019-10-15 01:56:37,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:37,729 INFO L93 Difference]: Finished difference Result 3811 states and 6632 transitions. [2019-10-15 01:56:37,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:56:37,732 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 63 [2019-10-15 01:56:37,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:37,748 INFO L225 Difference]: With dead ends: 3811 [2019-10-15 01:56:37,748 INFO L226 Difference]: Without dead ends: 2256 [2019-10-15 01:56:37,753 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 120 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2019-10-15 01:56:37,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2256 states. [2019-10-15 01:56:37,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2256 to 2222. [2019-10-15 01:56:37,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2222 states. [2019-10-15 01:56:37,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2222 states to 2222 states and 3220 transitions. [2019-10-15 01:56:37,836 INFO L78 Accepts]: Start accepts. Automaton has 2222 states and 3220 transitions. Word has length 63 [2019-10-15 01:56:37,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:37,837 INFO L462 AbstractCegarLoop]: Abstraction has 2222 states and 3220 transitions. [2019-10-15 01:56:37,837 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:56:37,837 INFO L276 IsEmpty]: Start isEmpty. Operand 2222 states and 3220 transitions. [2019-10-15 01:56:37,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-10-15 01:56:37,845 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:37,845 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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] [2019-10-15 01:56:38,056 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:38,057 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:38,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:38,058 INFO L82 PathProgramCache]: Analyzing trace with hash -746141361, now seen corresponding path program 1 times [2019-10-15 01:56:38,058 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:38,058 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403220647] [2019-10-15 01:56:38,059 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:38,059 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:38,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:38,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:38,209 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:56:38,209 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403220647] [2019-10-15 01:56:38,210 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998487271] [2019-10-15 01:56:38,210 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 [2019-10-15 01:56:38,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:38,304 INFO L256 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:56:38,308 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:38,343 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:56:38,344 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:38,414 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:56:38,415 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:56:38,415 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2019-10-15 01:56:38,415 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641702332] [2019-10-15 01:56:38,416 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:56:38,416 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:38,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:56:38,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:56:38,417 INFO L87 Difference]: Start difference. First operand 2222 states and 3220 transitions. Second operand 5 states. [2019-10-15 01:56:40,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:40,600 INFO L93 Difference]: Finished difference Result 5177 states and 7563 transitions. [2019-10-15 01:56:40,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:56:40,606 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 85 [2019-10-15 01:56:40,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:40,621 INFO L225 Difference]: With dead ends: 5177 [2019-10-15 01:56:40,622 INFO L226 Difference]: Without dead ends: 2960 [2019-10-15 01:56:40,628 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 165 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2019-10-15 01:56:40,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2960 states. [2019-10-15 01:56:40,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2960 to 2907. [2019-10-15 01:56:40,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2907 states. [2019-10-15 01:56:40,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2907 states to 2907 states and 4097 transitions. [2019-10-15 01:56:40,714 INFO L78 Accepts]: Start accepts. Automaton has 2907 states and 4097 transitions. Word has length 85 [2019-10-15 01:56:40,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:40,717 INFO L462 AbstractCegarLoop]: Abstraction has 2907 states and 4097 transitions. [2019-10-15 01:56:40,717 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:56:40,717 INFO L276 IsEmpty]: Start isEmpty. Operand 2907 states and 4097 transitions. [2019-10-15 01:56:40,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-10-15 01:56:40,721 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:40,722 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:40,928 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:40,929 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:40,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:40,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1805025969, now seen corresponding path program 1 times [2019-10-15 01:56:40,930 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:40,930 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265817089] [2019-10-15 01:56:40,930 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:40,931 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:40,931 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:40,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:41,051 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 30 proven. 13 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 01:56:41,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265817089] [2019-10-15 01:56:41,051 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014491517] [2019-10-15 01:56:41,052 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 [2019-10-15 01:56:41,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:41,163 INFO L256 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:56:41,167 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:41,234 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 65 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:56:41,234 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:41,329 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 30 proven. 13 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 01:56:41,331 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [668648142] [2019-10-15 01:56:41,377 INFO L162 IcfgInterpreter]: Started Sifa with 64 locations of interest [2019-10-15 01:56:41,377 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:56:41,385 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:56:41,393 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:56:41,394 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:56:41,604 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 55 for LOIs [2019-10-15 01:56:41,810 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 28