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_label47.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:56:33,609 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:56:33,611 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:56:33,624 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:56:33,643 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:56:33,646 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:56:33,649 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:56:33,650 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:56:33,651 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:56:33,654 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:56:33,655 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:56:33,660 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:56:33,665 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:56:33,667 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:56:33,668 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:56:33,670 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:56:33,674 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:56:33,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:56:33,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:56:33,689 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:56:33,689 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 01:56:33,715 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:56:33,716 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:56:33,718 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:56:33,718 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:56:33,719 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:56:33,719 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:56:33,719 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:56:33,720 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:56:33,720 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:56:33,720 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:56:33,721 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:56:33,721 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:56:33,721 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:56:33,722 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:56:33,722 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:56:33,722 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:56:33,722 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:56:33,723 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:56:33,723 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:56:33,724 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:56:33,724 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:56:33,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:56:33,726 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:56:33,727 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:56:33,728 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:56:33,728 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:56:33,729 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:56:33,729 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:56:33,729 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 01:56:34,013 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:56:34,033 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:56:34,037 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:56:34,039 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:56:34,040 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:56:34,040 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem16_label47.c [2019-10-15 01:56:34,119 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e15db13eb/55962fbac3a343ed9b6e6fa8ca7293ae/FLAG4e8c3d259 [2019-10-15 01:56:34,789 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:56:34,790 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem16_label47.c [2019-10-15 01:56:34,814 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e15db13eb/55962fbac3a343ed9b6e6fa8ca7293ae/FLAG4e8c3d259 [2019-10-15 01:56:34,956 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e15db13eb/55962fbac3a343ed9b6e6fa8ca7293ae [2019-10-15 01:56:34,968 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:56:34,970 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:56:34,971 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:56:34,971 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:56:34,974 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:56:34,975 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:56:34" (1/1) ... [2019-10-15 01:56:34,978 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f916025 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:34, skipping insertion in model container [2019-10-15 01:56:34,979 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:56:34" (1/1) ... [2019-10-15 01:56:34,986 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:56:35,076 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:56:35,876 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:56:35,881 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:56:36,094 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:56:36,116 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:56:36,116 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36 WrapperNode [2019-10-15 01:56:36,117 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:56:36,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:56:36,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:56:36,119 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:56:36,137 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,138 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,193 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,193 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,284 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,315 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,334 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (1/1) ... [2019-10-15 01:56:36,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:56:36,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:56:36,352 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:56:36,352 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:56:36,353 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (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 01:56:36,427 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:56:36,428 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:56:36,428 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 01:56:36,428 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 01:56:36,428 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:56:36,430 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 01:56:36,430 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 01:56:36,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:56:36,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:56:36,431 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 01:56:36,431 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:56:36,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:56:36,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:56:53,925 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:56:53,925 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:56:53,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:56:53 BoogieIcfgContainer [2019-10-15 01:56:53,929 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:56:53,930 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:56:53,930 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:56:53,933 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:56:53,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:56:34" (1/3) ... [2019-10-15 01:56:53,935 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61ea30a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:56:53, skipping insertion in model container [2019-10-15 01:56:53,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:36" (2/3) ... [2019-10-15 01:56:53,935 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61ea30a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:56:53, skipping insertion in model container [2019-10-15 01:56:53,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:56:53" (3/3) ... [2019-10-15 01:56:53,937 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem16_label47.c [2019-10-15 01:56:53,947 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:56:53,956 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:56:53,968 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:56:53,996 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:56:53,997 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:56:53,997 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:56:53,997 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:56:53,997 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:56:53,997 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:56:53,998 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:56:53,998 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:56:54,022 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states. [2019-10-15 01:56:54,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 01:56:54,029 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:54,030 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:54,032 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:54,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:54,038 INFO L82 PathProgramCache]: Analyzing trace with hash 863569471, now seen corresponding path program 1 times [2019-10-15 01:56:54,047 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:54,048 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847764709] [2019-10-15 01:56:54,048 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:54,048 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:54,048 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:54,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:54,290 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 01:56:54,293 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847764709] [2019-10-15 01:56:54,294 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:54,295 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:56:54,295 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540509532] [2019-10-15 01:56:54,300 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:56:54,300 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:54,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:56:54,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:56:54,319 INFO L87 Difference]: Start difference. First operand 244 states. Second operand 3 states. [2019-10-15 01:56:56,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:56,195 INFO L93 Difference]: Finished difference Result 718 states and 1389 transitions. [2019-10-15 01:56:56,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:56:56,196 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-10-15 01:56:56,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:56,215 INFO L225 Difference]: With dead ends: 718 [2019-10-15 01:56:56,216 INFO L226 Difference]: Without dead ends: 471 [2019-10-15 01:56:56,223 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 3 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 01:56:56,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2019-10-15 01:56:56,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 461. [2019-10-15 01:56:56,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 461 states. [2019-10-15 01:56:56,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 873 transitions. [2019-10-15 01:56:56,319 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 873 transitions. Word has length 11 [2019-10-15 01:56:56,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:56,319 INFO L462 AbstractCegarLoop]: Abstraction has 461 states and 873 transitions. [2019-10-15 01:56:56,319 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:56:56,320 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 873 transitions. [2019-10-15 01:56:56,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 01:56:56,321 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:56,322 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:56,322 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:56,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:56,322 INFO L82 PathProgramCache]: Analyzing trace with hash -197027157, now seen corresponding path program 1 times [2019-10-15 01:56:56,323 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:56,323 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886009543] [2019-10-15 01:56:56,323 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:56,323 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:56,323 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:56,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:56,440 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 01:56:56,441 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886009543] [2019-10-15 01:56:56,441 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:56,441 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:56:56,442 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705393110] [2019-10-15 01:56:56,443 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:56:56,443 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:56,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:56:56,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:56:56,444 INFO L87 Difference]: Start difference. First operand 461 states and 873 transitions. Second operand 5 states. [2019-10-15 01:56:58,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:58,557 INFO L93 Difference]: Finished difference Result 1387 states and 2652 transitions. [2019-10-15 01:56:58,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:56:58,562 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2019-10-15 01:56:58,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:58,570 INFO L225 Difference]: With dead ends: 1387 [2019-10-15 01:56:58,570 INFO L226 Difference]: Without dead ends: 931 [2019-10-15 01:56:58,575 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 01:56:58,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2019-10-15 01:56:58,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 923. [2019-10-15 01:56:58,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 923 states. [2019-10-15 01:56:58,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 923 states to 923 states and 1537 transitions. [2019-10-15 01:56:58,632 INFO L78 Accepts]: Start accepts. Automaton has 923 states and 1537 transitions. Word has length 23 [2019-10-15 01:56:58,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:58,633 INFO L462 AbstractCegarLoop]: Abstraction has 923 states and 1537 transitions. [2019-10-15 01:56:58,633 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:56:58,633 INFO L276 IsEmpty]: Start isEmpty. Operand 923 states and 1537 transitions. [2019-10-15 01:56:58,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-15 01:56:58,635 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:58,635 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] [2019-10-15 01:56:58,636 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:58,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:58,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1706167844, now seen corresponding path program 1 times [2019-10-15 01:56:58,636 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:58,637 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811405377] [2019-10-15 01:56:58,637 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:58,637 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:58,637 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:58,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:58,786 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 01:56:58,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811405377] [2019-10-15 01:56:58,786 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268996108] [2019-10-15 01:56:58,787 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 01:56:58,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:58,877 INFO L256 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:56:58,883 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:58,927 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 01:56:58,928 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:58,964 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 01:56:58,964 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:56:58,965 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 5 [2019-10-15 01:56:58,965 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135108035] [2019-10-15 01:56:58,966 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:56:58,966 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:58,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:56:58,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:56:58,967 INFO L87 Difference]: Start difference. First operand 923 states and 1537 transitions. Second operand 3 states. [2019-10-15 01:57:00,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:57:00,296 INFO L93 Difference]: Finished difference Result 1381 states and 2201 transitions. [2019-10-15 01:57:00,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:57:00,298 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 52 [2019-10-15 01:57:00,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:57:00,310 INFO L225 Difference]: With dead ends: 1381 [2019-10-15 01:57:00,311 INFO L226 Difference]: Without dead ends: 1379 [2019-10-15 01:57:00,313 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 102 SyntacticMatches, 5 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:57:00,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1379 states. [2019-10-15 01:57:00,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1379 to 933. [2019-10-15 01:57:00,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 933 states. [2019-10-15 01:57:00,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 933 states to 933 states and 1554 transitions. [2019-10-15 01:57:00,396 INFO L78 Accepts]: Start accepts. Automaton has 933 states and 1554 transitions. Word has length 52 [2019-10-15 01:57:00,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:57:00,397 INFO L462 AbstractCegarLoop]: Abstraction has 933 states and 1554 transitions. [2019-10-15 01:57:00,397 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:57:00,397 INFO L276 IsEmpty]: Start isEmpty. Operand 933 states and 1554 transitions. [2019-10-15 01:57:00,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-15 01:57:00,402 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:57:00,403 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] [2019-10-15 01:57:00,607 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:57:00,607 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:57:00,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:57:00,607 INFO L82 PathProgramCache]: Analyzing trace with hash 913820691, now seen corresponding path program 1 times [2019-10-15 01:57:00,608 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:57:00,608 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405764655] [2019-10-15 01:57:00,608 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:57:00,608 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:57:00,608 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:57:00,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:57:00,831 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 01:57:00,832 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405764655] [2019-10-15 01:57:00,832 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:57:00,832 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:57:00,832 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65237873] [2019-10-15 01:57:00,833 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:57:00,833 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:57:00,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:57:00,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:57:00,834 INFO L87 Difference]: Start difference. First operand 933 states and 1554 transitions. Second operand 6 states. [2019-10-15 01:57:02,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:57:02,924 INFO L93 Difference]: Finished difference Result 2572 states and 4312 transitions. [2019-10-15 01:57:02,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:57:02,928 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 67 [2019-10-15 01:57:02,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:57:02,945 INFO L225 Difference]: With dead ends: 2572 [2019-10-15 01:57:02,945 INFO L226 Difference]: Without dead ends: 1644 [2019-10-15 01:57:02,950 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 01:57:02,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1644 states. [2019-10-15 01:57:02,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1644 to 1608. [2019-10-15 01:57:02,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1608 states. [2019-10-15 01:57:03,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1608 states to 1608 states and 2455 transitions. [2019-10-15 01:57:03,009 INFO L78 Accepts]: Start accepts. Automaton has 1608 states and 2455 transitions. Word has length 67 [2019-10-15 01:57:03,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:57:03,009 INFO L462 AbstractCegarLoop]: Abstraction has 1608 states and 2455 transitions. [2019-10-15 01:57:03,009 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:57:03,010 INFO L276 IsEmpty]: Start isEmpty. Operand 1608 states and 2455 transitions. [2019-10-15 01:57:03,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2019-10-15 01:57:03,013 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:57:03,014 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2019-10-15 01:57:03,014 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:57:03,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:57:03,015 INFO L82 PathProgramCache]: Analyzing trace with hash -160848853, now seen corresponding path program 1 times [2019-10-15 01:57:03,015 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:57:03,015 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326807533] [2019-10-15 01:57:03,015 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:57:03,016 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:57:03,016 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:57:03,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:57:03,185 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:57:03,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326807533] [2019-10-15 01:57:03,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580167097] [2019-10-15 01:57:03,186 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 01:57:03,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:57:03,281 INFO L256 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:57:03,290 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:57:03,411 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:57:03,411 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:57:03,488 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:57:03,488 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296859648] [2019-10-15 01:57:03,517 INFO L162 IcfgInterpreter]: Started Sifa with 77 locations of interest [2019-10-15 01:57:03,518 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:57:03,524 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:57:03,533 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:57:03,534 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:57:03,683 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 57 for LOIs [2019-10-15 01:57:03,791 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 59 [2019-10-15 01:57:04,138 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 59 [2019-10-15 01:57:05,503 INFO L199 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 77 for LOIs [2019-10-15 01:57:05,763 WARN L191 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2019-10-15 01:57:05,765 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 61