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/Problem12_label50.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:51:25,169 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:51:25,172 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:51:25,189 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:51:25,213 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:51:25,215 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:51:25,217 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:51:25,218 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:51:25,220 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:51:25,221 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:51:25,222 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:51:25,226 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:51:25,230 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:51:25,232 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:51:25,235 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:51:25,235 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:51:25,237 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:51:25,246 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:51:25,247 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:51:25,249 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:51:25,250 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 01:51:25,265 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:51:25,265 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:51:25,266 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:51:25,266 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:51:25,266 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:51:25,267 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:51:25,267 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:51:25,267 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:51:25,267 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:51:25,267 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:51:25,268 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:51:25,268 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:51:25,268 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:51:25,268 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:51:25,268 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:51:25,268 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:51:25,269 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:51:25,269 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:51:25,269 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:51:25,269 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:51:25,269 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:51:25,270 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:51:25,270 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:51:25,270 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:51:25,270 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:51:25,270 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:51:25,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:51:25,271 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:51:25,271 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 01:51:25,563 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:51:25,584 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:51:25,587 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:51:25,588 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:51:25,589 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:51:25,589 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem12_label50.c [2019-10-15 01:51:25,656 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d76cea45f/dca4659426364551b250e6c584e15b83/FLAG0d23e3a7d [2019-10-15 01:51:26,388 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:51:26,388 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem12_label50.c [2019-10-15 01:51:26,422 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d76cea45f/dca4659426364551b250e6c584e15b83/FLAG0d23e3a7d [2019-10-15 01:51:26,476 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d76cea45f/dca4659426364551b250e6c584e15b83 [2019-10-15 01:51:26,484 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:51:26,486 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:51:26,487 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:51:26,487 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:51:26,490 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:51:26,491 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:51:26" (1/1) ... [2019-10-15 01:51:26,494 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47dba115 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:26, skipping insertion in model container [2019-10-15 01:51:26,495 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:51:26" (1/1) ... [2019-10-15 01:51:26,502 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:51:26,648 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:51:28,119 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:51:28,126 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:51:28,675 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:51:28,705 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:51:28,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28 WrapperNode [2019-10-15 01:51:28,706 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:51:28,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:51:28,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:51:28,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:51:28,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,775 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,777 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,864 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,902 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,925 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (1/1) ... [2019-10-15 01:51:28,950 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:51:28,951 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:51:28,951 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:51:28,951 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:51:28,952 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (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 01:51:29,019 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:51:29,020 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:51:29,020 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 01:51:29,020 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 01:51:29,020 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-10-15 01:51:29,021 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2019-10-15 01:51:29,021 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:51:29,021 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 01:51:29,021 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 01:51:29,021 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-10-15 01:51:29,021 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2019-10-15 01:51:29,022 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:51:29,022 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:51:29,022 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 01:51:29,022 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:51:29,022 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:51:29,023 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:51:34,994 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:51:34,994 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:51:34,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:51:34 BoogieIcfgContainer [2019-10-15 01:51:34,996 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:51:34,997 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:51:34,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:51:35,000 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:51:35,000 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:51:26" (1/3) ... [2019-10-15 01:51:35,001 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5014b75e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:51:35, skipping insertion in model container [2019-10-15 01:51:35,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:51:28" (2/3) ... [2019-10-15 01:51:35,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5014b75e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:51:35, skipping insertion in model container [2019-10-15 01:51:35,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:51:34" (3/3) ... [2019-10-15 01:51:35,008 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem12_label50.c [2019-10-15 01:51:35,017 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:51:35,029 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:51:35,041 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:51:35,075 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:51:35,075 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:51:35,075 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:51:35,075 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:51:35,075 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:51:35,076 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:51:35,076 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:51:35,076 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:51:35,109 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states. [2019-10-15 01:51:35,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 01:51:35,115 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:51:35,116 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:51:35,118 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:51:35,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:51:35,124 INFO L82 PathProgramCache]: Analyzing trace with hash -874915506, now seen corresponding path program 1 times [2019-10-15 01:51:35,133 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:51:35,133 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137953999] [2019-10-15 01:51:35,134 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:35,134 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:35,134 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:51:35,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:35,406 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 01:51:35,407 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137953999] [2019-10-15 01:51:35,407 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:51:35,408 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:51:35,408 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060408604] [2019-10-15 01:51:35,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:51:35,413 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:51:35,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:51:35,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:51:35,429 INFO L87 Difference]: Start difference. First operand 694 states. Second operand 3 states. [2019-10-15 01:51:39,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:51:39,885 INFO L93 Difference]: Finished difference Result 2068 states and 4065 transitions. [2019-10-15 01:51:39,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:51:39,886 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-10-15 01:51:39,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:51:39,921 INFO L225 Difference]: With dead ends: 2068 [2019-10-15 01:51:39,921 INFO L226 Difference]: Without dead ends: 1371 [2019-10-15 01:51:39,928 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 01:51:39,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1371 states. [2019-10-15 01:51:40,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1371 to 1367. [2019-10-15 01:51:40,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1367 states. [2019-10-15 01:51:40,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1367 states to 1367 states and 2628 transitions. [2019-10-15 01:51:40,078 INFO L78 Accepts]: Start accepts. Automaton has 1367 states and 2628 transitions. Word has length 11 [2019-10-15 01:51:40,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:51:40,079 INFO L462 AbstractCegarLoop]: Abstraction has 1367 states and 2628 transitions. [2019-10-15 01:51:40,079 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:51:40,079 INFO L276 IsEmpty]: Start isEmpty. Operand 1367 states and 2628 transitions. [2019-10-15 01:51:40,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:51:40,081 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:51:40,081 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 01:51:40,081 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:51:40,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:51:40,082 INFO L82 PathProgramCache]: Analyzing trace with hash -945933364, now seen corresponding path program 1 times [2019-10-15 01:51:40,082 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:51:40,082 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948574020] [2019-10-15 01:51:40,083 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:40,083 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:40,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:51:40,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:40,192 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 01:51:40,192 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948574020] [2019-10-15 01:51:40,192 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:51:40,193 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:51:40,193 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166269866] [2019-10-15 01:51:40,194 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:51:40,195 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:51:40,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:51:40,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:51:40,195 INFO L87 Difference]: Start difference. First operand 1367 states and 2628 transitions. Second operand 5 states. [2019-10-15 01:51:46,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:51:46,391 INFO L93 Difference]: Finished difference Result 4145 states and 7983 transitions. [2019-10-15 01:51:46,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:51:46,393 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2019-10-15 01:51:46,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:51:46,409 INFO L225 Difference]: With dead ends: 4145 [2019-10-15 01:51:46,409 INFO L226 Difference]: Without dead ends: 2783 [2019-10-15 01:51:46,413 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:51:46,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2783 states. [2019-10-15 01:51:46,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2783 to 2754. [2019-10-15 01:51:46,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2754 states. [2019-10-15 01:51:46,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2754 states to 2754 states and 4674 transitions. [2019-10-15 01:51:46,510 INFO L78 Accepts]: Start accepts. Automaton has 2754 states and 4674 transitions. Word has length 21 [2019-10-15 01:51:46,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:51:46,510 INFO L462 AbstractCegarLoop]: Abstraction has 2754 states and 4674 transitions. [2019-10-15 01:51:46,511 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:51:46,511 INFO L276 IsEmpty]: Start isEmpty. Operand 2754 states and 4674 transitions. [2019-10-15 01:51:46,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-15 01:51:46,512 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:51:46,512 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] [2019-10-15 01:51:46,512 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:51:46,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:51:46,513 INFO L82 PathProgramCache]: Analyzing trace with hash 821506528, now seen corresponding path program 1 times [2019-10-15 01:51:46,513 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:51:46,513 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285807964] [2019-10-15 01:51:46,514 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:46,514 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:46,514 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:51:46,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:46,674 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:51:46,675 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285807964] [2019-10-15 01:51:46,675 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596778433] [2019-10-15 01:51:46,675 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 01:51:46,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:46,741 INFO L256 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:51:46,748 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:51:46,821 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:51:46,821 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:51:46,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:51:46,907 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:51:46,907 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7, 4] total 11 [2019-10-15 01:51:46,912 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091468542] [2019-10-15 01:51:46,913 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:51:46,913 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:51:46,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:51:46,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:51:46,914 INFO L87 Difference]: Start difference. First operand 2754 states and 4674 transitions. Second operand 4 states. [2019-10-15 01:51:52,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:51:52,728 INFO L93 Difference]: Finished difference Result 8312 states and 14286 transitions. [2019-10-15 01:51:52,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:51:52,730 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2019-10-15 01:51:52,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:51:52,758 INFO L225 Difference]: With dead ends: 8312 [2019-10-15 01:51:52,758 INFO L226 Difference]: Without dead ends: 5563 [2019-10-15 01:51:52,765 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:51:52,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5563 states. [2019-10-15 01:51:52,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5563 to 5402. [2019-10-15 01:51:52,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5402 states. [2019-10-15 01:51:52,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5402 states to 5402 states and 8101 transitions. [2019-10-15 01:51:52,917 INFO L78 Accepts]: Start accepts. Automaton has 5402 states and 8101 transitions. Word has length 27 [2019-10-15 01:51:52,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:51:52,918 INFO L462 AbstractCegarLoop]: Abstraction has 5402 states and 8101 transitions. [2019-10-15 01:51:52,918 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:51:52,918 INFO L276 IsEmpty]: Start isEmpty. Operand 5402 states and 8101 transitions. [2019-10-15 01:51:52,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-15 01:51:52,930 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:51:52,930 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, 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 01:51:53,139 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:51:53,140 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:51:53,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:51:53,141 INFO L82 PathProgramCache]: Analyzing trace with hash -2080223329, now seen corresponding path program 1 times [2019-10-15 01:51:53,141 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:51:53,141 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525329723] [2019-10-15 01:51:53,141 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:53,141 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:53,142 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:51:53,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:53,381 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 01:51:53,381 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525329723] [2019-10-15 01:51:53,382 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:51:53,382 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:51:53,382 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337766432] [2019-10-15 01:51:53,384 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:51:53,384 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:51:53,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:51:53,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:51:53,386 INFO L87 Difference]: Start difference. First operand 5402 states and 8101 transitions. Second operand 6 states. [2019-10-15 01:51:59,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:51:59,011 INFO L93 Difference]: Finished difference Result 16499 states and 25934 transitions. [2019-10-15 01:51:59,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:51:59,011 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 72 [2019-10-15 01:51:59,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:51:59,068 INFO L225 Difference]: With dead ends: 16499 [2019-10-15 01:51:59,068 INFO L226 Difference]: Without dead ends: 11102 [2019-10-15 01:51:59,084 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 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 01:51:59,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11102 states. [2019-10-15 01:51:59,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11102 to 10360. [2019-10-15 01:51:59,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10360 states. [2019-10-15 01:51:59,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10360 states to 10360 states and 15625 transitions. [2019-10-15 01:51:59,411 INFO L78 Accepts]: Start accepts. Automaton has 10360 states and 15625 transitions. Word has length 72 [2019-10-15 01:51:59,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:51:59,412 INFO L462 AbstractCegarLoop]: Abstraction has 10360 states and 15625 transitions. [2019-10-15 01:51:59,412 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:51:59,412 INFO L276 IsEmpty]: Start isEmpty. Operand 10360 states and 15625 transitions. [2019-10-15 01:51:59,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-15 01:51:59,415 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:51:59,416 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 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] [2019-10-15 01:51:59,417 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:51:59,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:51:59,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1400976341, now seen corresponding path program 1 times [2019-10-15 01:51:59,417 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:51:59,419 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120605982] [2019-10-15 01:51:59,419 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:59,420 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:51:59,420 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:51:59,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:59,721 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:51:59,722 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120605982] [2019-10-15 01:51:59,722 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255533693] [2019-10-15 01:51:59,723 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 01:51:59,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:51:59,836 INFO L256 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:51:59,844 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:51:59,883 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-15 01:51:59,884 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:51:59,948 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:51:59,949 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:51:59,949 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2019-10-15 01:51:59,949 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328289828] [2019-10-15 01:51:59,950 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:51:59,951 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:51:59,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:51:59,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2019-10-15 01:51:59,952 INFO L87 Difference]: Start difference. First operand 10360 states and 15625 transitions. Second operand 5 states.