/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/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_label48.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 02:04:40,052 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 02:04:40,055 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 02:04:40,073 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 02:04:40,097 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 02:04:40,101 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 02:04:40,102 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 02:04:40,103 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 02:04:40,103 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 02:04:40,104 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 02:04:40,106 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 02:04:40,107 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 02:04:40,109 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 02:04:40,110 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 02:04:40,111 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 02:04:40,114 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 02:04:40,116 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 02:04:40,130 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 02:04:40,132 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 02:04:40,133 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 02:04:40,134 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 [2019-11-07 02:04:40,155 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 02:04:40,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 02:04:40,157 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 02:04:40,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 02:04:40,157 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 02:04:40,157 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 02:04:40,157 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 02:04:40,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 02:04:40,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 02:04:40,158 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 02:04:40,159 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 02:04:40,159 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 02:04:40,160 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 02:04:40,160 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 02:04:40,160 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 02:04:40,160 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 02:04:40,161 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 02:04:40,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 02:04:40,161 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 02:04:40,161 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 02:04:40,161 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 02:04:40,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 02:04:40,162 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 02:04:40,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 02:04:40,162 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 02:04:40,162 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 02:04:40,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 02:04:40,163 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 02:04:40,163 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 [2019-11-07 02:04:40,423 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 02:04:40,435 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 02:04:40,439 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 02:04:40,440 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 02:04:40,441 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 02:04:40,441 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem16_label48.c [2019-11-07 02:04:40,501 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3837e199/2ad2703c624c43418b83603987d768e6/FLAG75ce386d6 [2019-11-07 02:04:41,194 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 02:04:41,195 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem16_label48.c [2019-11-07 02:04:41,215 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3837e199/2ad2703c624c43418b83603987d768e6/FLAG75ce386d6 [2019-11-07 02:04:41,354 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3837e199/2ad2703c624c43418b83603987d768e6 [2019-11-07 02:04:41,367 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 02:04:41,369 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 02:04:41,370 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 02:04:41,370 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 02:04:41,374 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 02:04:41,375 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:41" (1/1) ... [2019-11-07 02:04:41,378 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fa31aa5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:41, skipping insertion in model container [2019-11-07 02:04:41,378 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:04:41" (1/1) ... [2019-11-07 02:04:41,386 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 02:04:41,475 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 02:04:42,321 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 02:04:42,328 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 02:04:42,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 02:04:42,551 INFO L192 MainTranslator]: Completed translation [2019-11-07 02:04:42,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42 WrapperNode [2019-11-07 02:04:42,552 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 02:04:42,553 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 02:04:42,553 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 02:04:42,553 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 02:04:42,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,605 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,678 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,708 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,725 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... [2019-11-07 02:04:42,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 02:04:42,742 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 02:04:42,742 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 02:04:42,743 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 02:04:42,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 02:04:42,813 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 02:04:42,813 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 02:04:42,813 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-07 02:04:42,814 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-11-07 02:04:42,814 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 02:04:42,814 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-07 02:04:42,814 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-11-07 02:04:42,814 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 02:04:42,815 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 02:04:42,815 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-07 02:04:42,815 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 02:04:42,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 02:04:42,815 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 02:05:03,992 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 02:05:03,992 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 02:05:03,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:05:03 BoogieIcfgContainer [2019-11-07 02:05:03,996 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 02:05:03,997 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 02:05:03,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 02:05:04,002 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 02:05:04,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:04:41" (1/3) ... [2019-11-07 02:05:04,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40895439 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:05:04, skipping insertion in model container [2019-11-07 02:05:04,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:04:42" (2/3) ... [2019-11-07 02:05:04,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40895439 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:05:04, skipping insertion in model container [2019-11-07 02:05:04,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:05:03" (3/3) ... [2019-11-07 02:05:04,005 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem16_label48.c [2019-11-07 02:05:04,013 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 02:05:04,020 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 02:05:04,030 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 02:05:04,057 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 02:05:04,057 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 02:05:04,057 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 02:05:04,058 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 02:05:04,058 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 02:05:04,058 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 02:05:04,058 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 02:05:04,058 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 02:05:04,152 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states. [2019-11-07 02:05:04,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 02:05:04,157 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 02:05:04,158 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 02:05:04,160 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 02:05:04,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 02:05:04,164 INFO L82 PathProgramCache]: Analyzing trace with hash 863569215, now seen corresponding path program 1 times [2019-11-07 02:05:04,171 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 02:05:04,171 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413960663] [2019-11-07 02:05:04,171 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 02:05:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:04,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:04,398 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413960663] [2019-11-07 02:05:04,399 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 02:05:04,399 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 02:05:04,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687716096] [2019-11-07 02:05:04,405 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 02:05:04,406 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 02:05:04,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 02:05:04,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 02:05:04,422 INFO L87 Difference]: Start difference. First operand 244 states. Second operand 3 states. [2019-11-07 02:05:06,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 02:05:06,445 INFO L93 Difference]: Finished difference Result 718 states and 1389 transitions. [2019-11-07 02:05:06,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 02:05:06,447 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-07 02:05:06,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 02:05:06,467 INFO L225 Difference]: With dead ends: 718 [2019-11-07 02:05:06,468 INFO L226 Difference]: Without dead ends: 471 [2019-11-07 02:05:06,476 INFO L630 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 [2019-11-07 02:05:06,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2019-11-07 02:05:06,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 461. [2019-11-07 02:05:06,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 461 states. [2019-11-07 02:05:06,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 873 transitions. [2019-11-07 02:05:06,599 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 873 transitions. Word has length 11 [2019-11-07 02:05:06,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 02:05:06,603 INFO L462 AbstractCegarLoop]: Abstraction has 461 states and 873 transitions. [2019-11-07 02:05:06,603 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 02:05:06,603 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 873 transitions. [2019-11-07 02:05:06,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-07 02:05:06,606 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 02:05:06,606 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 02:05:06,607 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 02:05:06,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 02:05:06,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1645968157, now seen corresponding path program 1 times [2019-11-07 02:05:06,607 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 02:05:06,608 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782562207] [2019-11-07 02:05:06,608 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 02:05:06,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:06,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:06,768 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782562207] [2019-11-07 02:05:06,771 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 02:05:06,771 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 02:05:06,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710485214] [2019-11-07 02:05:06,773 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 02:05:06,773 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 02:05:06,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 02:05:06,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 02:05:06,775 INFO L87 Difference]: Start difference. First operand 461 states and 873 transitions. Second operand 5 states. [2019-11-07 02:05:08,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 02:05:08,929 INFO L93 Difference]: Finished difference Result 1387 states and 2652 transitions. [2019-11-07 02:05:08,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-07 02:05:08,934 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 23 [2019-11-07 02:05:08,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 02:05:08,943 INFO L225 Difference]: With dead ends: 1387 [2019-11-07 02:05:08,944 INFO L226 Difference]: Without dead ends: 931 [2019-11-07 02:05:08,946 INFO L630 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 [2019-11-07 02:05:08,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2019-11-07 02:05:08,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 923. [2019-11-07 02:05:08,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 923 states. [2019-11-07 02:05:09,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 923 states to 923 states and 1537 transitions. [2019-11-07 02:05:09,002 INFO L78 Accepts]: Start accepts. Automaton has 923 states and 1537 transitions. Word has length 23 [2019-11-07 02:05:09,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 02:05:09,003 INFO L462 AbstractCegarLoop]: Abstraction has 923 states and 1537 transitions. [2019-11-07 02:05:09,003 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 02:05:09,003 INFO L276 IsEmpty]: Start isEmpty. Operand 923 states and 1537 transitions. [2019-11-07 02:05:09,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-07 02:05:09,005 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 02:05:09,005 INFO L410 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] [2019-11-07 02:05:09,006 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 02:05:09,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 02:05:09,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1633645332, now seen corresponding path program 1 times [2019-11-07 02:05:09,006 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 02:05:09,007 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727086735] [2019-11-07 02:05:09,007 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 02:05:09,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:09,127 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 02:05:09,127 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727086735] [2019-11-07 02:05:09,128 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419948789] [2019-11-07 02:05:09,128 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 02:05:09,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:09,224 INFO L256 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 02:05:09,235 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 02:05:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:09,300 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 02:05:09,356 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:09,356 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 02:05:09,357 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 5 [2019-11-07 02:05:09,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406381190] [2019-11-07 02:05:09,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 02:05:09,358 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 02:05:09,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 02:05:09,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-07 02:05:09,359 INFO L87 Difference]: Start difference. First operand 923 states and 1537 transitions. Second operand 3 states. [2019-11-07 02:05:11,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 02:05:11,076 INFO L93 Difference]: Finished difference Result 1381 states and 2201 transitions. [2019-11-07 02:05:11,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 02:05:11,077 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 52 [2019-11-07 02:05:11,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 02:05:11,085 INFO L225 Difference]: With dead ends: 1381 [2019-11-07 02:05:11,086 INFO L226 Difference]: Without dead ends: 1379 [2019-11-07 02:05:11,087 INFO L630 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 [2019-11-07 02:05:11,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1379 states. [2019-11-07 02:05:11,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1379 to 933. [2019-11-07 02:05:11,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 933 states. [2019-11-07 02:05:11,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 933 states to 933 states and 1554 transitions. [2019-11-07 02:05:11,146 INFO L78 Accepts]: Start accepts. Automaton has 933 states and 1554 transitions. Word has length 52 [2019-11-07 02:05:11,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 02:05:11,147 INFO L462 AbstractCegarLoop]: Abstraction has 933 states and 1554 transitions. [2019-11-07 02:05:11,147 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 02:05:11,147 INFO L276 IsEmpty]: Start isEmpty. Operand 933 states and 1554 transitions. [2019-11-07 02:05:11,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-07 02:05:11,149 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 02:05:11,150 INFO L410 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] [2019-11-07 02:05:11,356 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 02:05:11,357 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 02:05:11,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 02:05:11,357 INFO L82 PathProgramCache]: Analyzing trace with hash -623852981, now seen corresponding path program 1 times [2019-11-07 02:05:11,358 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 02:05:11,358 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758071942] [2019-11-07 02:05:11,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 02:05:11,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:11,544 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:11,544 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758071942] [2019-11-07 02:05:11,545 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 02:05:11,545 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-07 02:05:11,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081441567] [2019-11-07 02:05:11,546 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 02:05:11,546 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 02:05:11,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 02:05:11,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-07 02:05:11,547 INFO L87 Difference]: Start difference. First operand 933 states and 1554 transitions. Second operand 6 states. [2019-11-07 02:05:14,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 02:05:14,232 INFO L93 Difference]: Finished difference Result 2572 states and 4312 transitions. [2019-11-07 02:05:14,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-07 02:05:14,233 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 67 [2019-11-07 02:05:14,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 02:05:14,252 INFO L225 Difference]: With dead ends: 2572 [2019-11-07 02:05:14,252 INFO L226 Difference]: Without dead ends: 1644 [2019-11-07 02:05:14,257 INFO L630 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 [2019-11-07 02:05:14,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1644 states. [2019-11-07 02:05:14,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1644 to 1608. [2019-11-07 02:05:14,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1608 states. [2019-11-07 02:05:14,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1608 states to 1608 states and 2455 transitions. [2019-11-07 02:05:14,327 INFO L78 Accepts]: Start accepts. Automaton has 1608 states and 2455 transitions. Word has length 67 [2019-11-07 02:05:14,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 02:05:14,329 INFO L462 AbstractCegarLoop]: Abstraction has 1608 states and 2455 transitions. [2019-11-07 02:05:14,329 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 02:05:14,329 INFO L276 IsEmpty]: Start isEmpty. Operand 1608 states and 2455 transitions. [2019-11-07 02:05:14,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2019-11-07 02:05:14,339 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 02:05:14,340 INFO L410 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] [2019-11-07 02:05:14,340 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 02:05:14,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 02:05:14,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1197635685, now seen corresponding path program 1 times [2019-11-07 02:05:14,341 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 02:05:14,341 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77270566] [2019-11-07 02:05:14,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 02:05:14,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:14,541 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:14,542 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77270566] [2019-11-07 02:05:14,542 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584776530] [2019-11-07 02:05:14,543 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 02:05:14,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 02:05:14,648 INFO L256 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 02:05:14,654 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 02:05:14,719 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:14,719 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 02:05:14,937 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 64 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 02:05:14,938 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1785610808] [2019-11-07 02:05:14,979 INFO L159 IcfgInterpreter]: Started Sifa with 77 locations of interest [2019-11-07 02:05:14,979 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 02:05:14,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 02:05:14,994 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 02:05:14,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 02:05:15,128 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 57 for LOIs [2019-11-07 02:05:15,240 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 58 [2019-11-07 02:05:15,497 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 58