/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/array-industry-pattern/check_removal_from_set_after_insertion.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:28:57,301 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:28:57,304 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:28:57,316 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:28:57,317 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:28:57,318 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:28:57,319 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:28:57,321 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:28:57,323 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:28:57,324 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:28:57,325 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:28:57,326 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:28:57,326 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:28:57,327 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:28:57,328 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:28:57,329 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:28:57,330 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:28:57,331 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:28:57,333 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:28:57,335 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:28:57,336 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:28:57,337 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:28:57,338 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:28:57,339 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:28:57,341 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 01:28:57,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 01:28:57,342 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 01:28:57,343 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 01:28:57,343 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 01:28:57,344 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 01:28:57,344 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 01:28:57,345 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 01:28:57,346 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 01:28:57,347 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 01:28:57,348 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 01:28:57,348 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 01:28:57,348 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 01:28:57,349 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 01:28:57,349 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:28:57,350 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:28:57,350 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:28:57,351 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 01:28:57,367 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:28:57,367 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:28:57,369 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:28:57,369 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:28:57,369 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:28:57,370 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:28:57,370 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:28:57,371 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:28:57,371 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:28:57,371 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:28:57,371 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:28:57,371 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:28:57,372 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:28:57,372 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:28:57,372 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:28:57,372 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:28:57,372 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:28:57,373 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:28:57,374 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:28:57,374 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:28:57,374 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:28:57,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:28:57,375 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:28:57,375 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:28:57,375 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:28:57,375 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:28:57,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:28:57,376 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:28:57,376 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 01:28:57,678 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:28:57,692 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:28:57,696 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:28:57,698 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:28:57,698 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:28:57,699 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c [2019-11-07 01:28:57,766 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/857763d63/27bf56d4f7b14d1190fd926249a28f1d/FLAG2b21d471b [2019-11-07 01:28:58,225 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:28:58,226 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/check_removal_from_set_after_insertion.c [2019-11-07 01:28:58,235 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/857763d63/27bf56d4f7b14d1190fd926249a28f1d/FLAG2b21d471b [2019-11-07 01:28:58,579 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/857763d63/27bf56d4f7b14d1190fd926249a28f1d [2019-11-07 01:28:58,591 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:28:58,593 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:28:58,595 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:28:58,595 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:28:58,598 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:28:58,599 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:58,603 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@179fea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58, skipping insertion in model container [2019-11-07 01:28:58,603 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:58,611 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:28:58,635 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:28:58,829 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:28:58,839 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:28:58,867 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:28:58,986 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:28:58,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58 WrapperNode [2019-11-07 01:28:58,986 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:28:58,987 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:28:58,987 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:28:58,987 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:28:58,998 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:58,999 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:59,007 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:59,008 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:59,018 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:59,025 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:59,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (1/1) ... [2019-11-07 01:28:59,030 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:28:59,031 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:28:59,031 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:28:59,031 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:28:59,032 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (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 01:28:59,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:28:59,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:28:59,091 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:28:59,091 INFO L138 BoogieDeclarations]: Found implementation of procedure insert [2019-11-07 01:28:59,092 INFO L138 BoogieDeclarations]: Found implementation of procedure elem_exists [2019-11-07 01:28:59,092 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:28:59,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:28:59,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:28:59,092 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:28:59,092 INFO L130 BoogieDeclarations]: Found specification of procedure insert [2019-11-07 01:28:59,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:28:59,093 INFO L130 BoogieDeclarations]: Found specification of procedure elem_exists [2019-11-07 01:28:59,093 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:28:59,093 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:28:59,093 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:28:59,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:28:59,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:28:59,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:28:59,625 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:28:59,626 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-11-07 01:28:59,627 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:28:59 BoogieIcfgContainer [2019-11-07 01:28:59,627 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:28:59,628 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:28:59,629 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:28:59,632 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:28:59,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:28:58" (1/3) ... [2019-11-07 01:28:59,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41a184d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:28:59, skipping insertion in model container [2019-11-07 01:28:59,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:28:58" (2/3) ... [2019-11-07 01:28:59,634 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41a184d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:28:59, skipping insertion in model container [2019-11-07 01:28:59,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:28:59" (3/3) ... [2019-11-07 01:28:59,636 INFO L109 eAbstractionObserver]: Analyzing ICFG check_removal_from_set_after_insertion.c [2019-11-07 01:28:59,647 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:28:59,656 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:28:59,668 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:28:59,708 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:28:59,709 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:28:59,709 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:28:59,709 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:28:59,709 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:28:59,710 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:28:59,710 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:28:59,710 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:28:59,738 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2019-11-07 01:28:59,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:28:59,747 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:28:59,748 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:28:59,752 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:28:59,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:28:59,760 INFO L82 PathProgramCache]: Analyzing trace with hash -1837632078, now seen corresponding path program 1 times [2019-11-07 01:28:59,770 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:28:59,772 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618582000] [2019-11-07 01:28:59,772 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:28:59,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:28:59,963 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 01:28:59,965 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618582000] [2019-11-07 01:28:59,966 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:28:59,967 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:28:59,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322834392] [2019-11-07 01:28:59,975 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:28:59,976 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:28:59,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:28:59,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:28:59,995 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 3 states. [2019-11-07 01:29:00,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:00,068 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2019-11-07 01:29:00,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:29:00,070 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-07 01:29:00,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:00,079 INFO L225 Difference]: With dead ends: 57 [2019-11-07 01:29:00,080 INFO L226 Difference]: Without dead ends: 34 [2019-11-07 01:29:00,084 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:29:00,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-07 01:29:00,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-07 01:29:00,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-07 01:29:00,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-11-07 01:29:00,131 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 15 [2019-11-07 01:29:00,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:00,131 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-11-07 01:29:00,132 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:29:00,132 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-11-07 01:29:00,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:29:00,133 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:00,133 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:00,134 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:00,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:00,135 INFO L82 PathProgramCache]: Analyzing trace with hash -659682392, now seen corresponding path program 1 times [2019-11-07 01:29:00,135 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:00,135 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611546501] [2019-11-07 01:29:00,135 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:00,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:00,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:29:00,270 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611546501] [2019-11-07 01:29:00,270 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394481774] [2019-11-07 01:29:00,271 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 01:29:00,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:00,330 INFO L256 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:29:00,338 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:00,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:29:00,389 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:00,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:29:00,431 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 01:29:00,431 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 8 [2019-11-07 01:29:00,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339664575] [2019-11-07 01:29:00,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 01:29:00,434 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:00,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 01:29:00,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-07 01:29:00,435 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 6 states. [2019-11-07 01:29:00,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:00,614 INFO L93 Difference]: Finished difference Result 72 states and 90 transitions. [2019-11-07 01:29:00,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 01:29:00,614 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-07 01:29:00,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:00,617 INFO L225 Difference]: With dead ends: 72 [2019-11-07 01:29:00,618 INFO L226 Difference]: Without dead ends: 44 [2019-11-07 01:29:00,619 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-07 01:29:00,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-07 01:29:00,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2019-11-07 01:29:00,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:29:00,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-11-07 01:29:00,653 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 17 [2019-11-07 01:29:00,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:00,653 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-11-07 01:29:00,654 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 01:29:00,654 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-11-07 01:29:00,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 01:29:00,655 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:00,655 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:00,858 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:00,859 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:00,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:00,861 INFO L82 PathProgramCache]: Analyzing trace with hash -2055252280, now seen corresponding path program 1 times [2019-11-07 01:29:00,862 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:00,862 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093015712] [2019-11-07 01:29:00,862 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:00,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:00,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:29:00,984 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093015712] [2019-11-07 01:29:00,984 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966638366] [2019-11-07 01:29:00,984 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 01:29:01,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:01,040 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:29:01,042 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:01,107 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:29:01,107 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:29:01,166 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1824252149] [2019-11-07 01:29:01,214 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-11-07 01:29:01,215 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:01,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:01,228 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:01,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:01,407 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-11-07 01:29:03,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:29:03,704 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:29:04,105 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:29:04,105 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 6, 6] total 21 [2019-11-07 01:29:04,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758290590] [2019-11-07 01:29:04,107 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-07 01:29:04,107 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:04,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-07 01:29:04,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2019-11-07 01:29:04,109 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 11 states. [2019-11-07 01:29:04,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:04,454 INFO L93 Difference]: Finished difference Result 57 states and 70 transitions. [2019-11-07 01:29:04,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-07 01:29:04,455 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2019-11-07 01:29:04,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:04,456 INFO L225 Difference]: With dead ends: 57 [2019-11-07 01:29:04,456 INFO L226 Difference]: Without dead ends: 43 [2019-11-07 01:29:04,457 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:29:04,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-07 01:29:04,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2019-11-07 01:29:04,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 01:29:04,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2019-11-07 01:29:04,467 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 19 [2019-11-07 01:29:04,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:04,467 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2019-11-07 01:29:04,467 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-07 01:29:04,468 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2019-11-07 01:29:04,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 01:29:04,469 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:04,469 INFO L410 BasicCegarLoop]: trace histogram [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] [2019-11-07 01:29:04,672 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:04,673 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:04,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:04,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1072893512, now seen corresponding path program 1 times [2019-11-07 01:29:04,673 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:04,674 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937933402] [2019-11-07 01:29:04,674 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:04,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:04,741 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:29:04,741 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937933402] [2019-11-07 01:29:04,742 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:04,742 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:29:04,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338796705] [2019-11-07 01:29:04,743 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:29:04,743 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:04,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:29:04,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:29:04,744 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand 4 states. [2019-11-07 01:29:04,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:04,768 INFO L93 Difference]: Finished difference Result 69 states and 83 transitions. [2019-11-07 01:29:04,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:29:04,771 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2019-11-07 01:29:04,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:04,773 INFO L225 Difference]: With dead ends: 69 [2019-11-07 01:29:04,773 INFO L226 Difference]: Without dead ends: 41 [2019-11-07 01:29:04,773 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:29:04,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-07 01:29:04,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-11-07 01:29:04,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-07 01:29:04,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2019-11-07 01:29:04,794 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 28 [2019-11-07 01:29:04,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:04,794 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2019-11-07 01:29:04,794 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:29:04,794 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2019-11-07 01:29:04,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 01:29:04,797 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:04,797 INFO L410 BasicCegarLoop]: trace histogram [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] [2019-11-07 01:29:04,798 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:04,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:04,799 INFO L82 PathProgramCache]: Analyzing trace with hash 2012221557, now seen corresponding path program 1 times [2019-11-07 01:29:04,799 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:04,799 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146977260] [2019-11-07 01:29:04,799 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:04,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:04,905 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:29:04,905 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146977260] [2019-11-07 01:29:04,905 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390440282] [2019-11-07 01:29:04,906 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:04,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:04,976 INFO L256 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:29:04,979 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:05,015 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:29:05,015 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:05,063 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:29:05,063 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020839776] [2019-11-07 01:29:05,065 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2019-11-07 01:29:05,066 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:05,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:05,066 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:05,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:05,094 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-11-07 01:29:05,440 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-11-07 01:29:05,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:29:05,456 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 3 for LOIs [2019-11-07 01:29:05,461 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:29:06,303 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:29:06,303 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6, 22] total 33 [2019-11-07 01:29:06,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671268579] [2019-11-07 01:29:06,305 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-07 01:29:06,305 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:06,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-07 01:29:06,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=911, Unknown=0, NotChecked=0, Total=1056 [2019-11-07 01:29:06,306 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand 33 states. [2019-11-07 01:29:07,591 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 46 [2019-11-07 01:29:07,787 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2019-11-07 01:29:13,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:13,500 INFO L93 Difference]: Finished difference Result 212 states and 288 transitions. [2019-11-07 01:29:13,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2019-11-07 01:29:13,501 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 29 [2019-11-07 01:29:13,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:13,510 INFO L225 Difference]: With dead ends: 212 [2019-11-07 01:29:13,510 INFO L226 Difference]: Without dead ends: 179 [2019-11-07 01:29:13,518 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1700, Invalid=8400, Unknown=0, NotChecked=0, Total=10100 [2019-11-07 01:29:13,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-11-07 01:29:13,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 58. [2019-11-07 01:29:13,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-07 01:29:13,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2019-11-07 01:29:13,567 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 29 [2019-11-07 01:29:13,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:13,574 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2019-11-07 01:29:13,574 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-07 01:29:13,574 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2019-11-07 01:29:13,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-07 01:29:13,575 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:13,576 INFO L410 BasicCegarLoop]: trace histogram [6, 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] [2019-11-07 01:29:13,780 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:13,780 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:13,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:13,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1337455549, now seen corresponding path program 2 times [2019-11-07 01:29:13,781 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:13,783 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118597316] [2019-11-07 01:29:13,783 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:13,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:13,862 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-11-07 01:29:13,862 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118597316] [2019-11-07 01:29:13,862 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:29:13,863 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:29:13,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885909016] [2019-11-07 01:29:13,863 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:29:13,863 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:13,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:29:13,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:29:13,864 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand 5 states. [2019-11-07 01:29:13,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:13,906 INFO L93 Difference]: Finished difference Result 110 states and 134 transitions. [2019-11-07 01:29:13,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:29:13,907 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2019-11-07 01:29:13,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:13,908 INFO L225 Difference]: With dead ends: 110 [2019-11-07 01:29:13,909 INFO L226 Difference]: Without dead ends: 65 [2019-11-07 01:29:13,909 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:29:13,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-11-07 01:29:13,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61. [2019-11-07 01:29:13,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-07 01:29:13,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 72 transitions. [2019-11-07 01:29:13,922 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 72 transitions. Word has length 34 [2019-11-07 01:29:13,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:13,922 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 72 transitions. [2019-11-07 01:29:13,922 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:29:13,923 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 72 transitions. [2019-11-07 01:29:13,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-07 01:29:13,925 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:13,925 INFO L410 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:13,925 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:13,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:13,926 INFO L82 PathProgramCache]: Analyzing trace with hash -783299171, now seen corresponding path program 1 times [2019-11-07 01:29:13,926 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:13,926 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632686315] [2019-11-07 01:29:13,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:13,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:14,020 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:29:14,021 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632686315] [2019-11-07 01:29:14,021 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492163091] [2019-11-07 01:29:14,021 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:14,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:14,097 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-07 01:29:14,100 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:14,235 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:29:14,235 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:14,346 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:29:14,346 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1291477300] [2019-11-07 01:29:14,348 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-11-07 01:29:14,349 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:14,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:14,349 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:14,350 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:14,371 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-11-07 01:29:14,946 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-11-07 01:29:14,953 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 9 for LOIs [2019-11-07 01:29:14,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:29:14,959 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 48 for LOIs [2019-11-07 01:29:14,968 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:29:16,184 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:29:16,184 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 25] total 49 [2019-11-07 01:29:16,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27632682] [2019-11-07 01:29:16,187 INFO L442 AbstractCegarLoop]: Interpolant automaton has 49 states [2019-11-07 01:29:16,188 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:16,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2019-11-07 01:29:16,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=2013, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 01:29:16,189 INFO L87 Difference]: Start difference. First operand 61 states and 72 transitions. Second operand 49 states. [2019-11-07 01:29:17,136 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2019-11-07 01:29:17,297 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 48 [2019-11-07 01:29:18,201 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 51 [2019-11-07 01:29:18,420 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 41 [2019-11-07 01:29:18,834 WARN L191 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 54 [2019-11-07 01:29:19,032 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 41 [2019-11-07 01:29:19,222 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 48 [2019-11-07 01:29:19,506 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 32 [2019-11-07 01:29:19,767 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2019-11-07 01:29:20,529 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 33 [2019-11-07 01:29:21,454 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 35 [2019-11-07 01:29:23,214 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 33 [2019-11-07 01:29:23,926 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 38 [2019-11-07 01:29:24,240 WARN L191 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2019-11-07 01:29:24,571 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 51 [2019-11-07 01:29:24,741 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 41 [2019-11-07 01:29:25,164 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 54 [2019-11-07 01:29:28,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:29:28,770 INFO L93 Difference]: Finished difference Result 290 states and 378 transitions. [2019-11-07 01:29:28,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2019-11-07 01:29:28,772 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 37 [2019-11-07 01:29:28,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:29:28,774 INFO L225 Difference]: With dead ends: 290 [2019-11-07 01:29:28,774 INFO L226 Difference]: Without dead ends: 241 [2019-11-07 01:29:28,782 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7397 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=3310, Invalid=17282, Unknown=0, NotChecked=0, Total=20592 [2019-11-07 01:29:28,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2019-11-07 01:29:28,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 93. [2019-11-07 01:29:28,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-11-07 01:29:28,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 110 transitions. [2019-11-07 01:29:28,806 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 110 transitions. Word has length 37 [2019-11-07 01:29:28,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:29:28,807 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 110 transitions. [2019-11-07 01:29:28,807 INFO L463 AbstractCegarLoop]: Interpolant automaton has 49 states. [2019-11-07 01:29:28,807 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 110 transitions. [2019-11-07 01:29:28,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:29:28,809 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:29:28,809 INFO L410 BasicCegarLoop]: trace histogram [14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:29:29,010 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:29,011 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:29:29,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:29:29,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1625033245, now seen corresponding path program 2 times [2019-11-07 01:29:29,011 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:29:29,012 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438390464] [2019-11-07 01:29:29,012 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:29:29,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:29:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:29:29,288 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438390464] [2019-11-07 01:29:29,288 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137014824] [2019-11-07 01:29:29,288 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:29:29,362 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:29:29,363 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:29:29,364 INFO L256 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:29:29,366 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:29:29,402 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-11-07 01:29:29,403 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:29:29,467 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2019-11-07 01:29:29,467 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [848049347] [2019-11-07 01:29:29,470 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-11-07 01:29:29,471 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:29:29,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:29:29,474 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:29:29,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:29:29,503 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 26 for LOIs [2019-11-07 01:29:29,965 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2019-11-07 01:29:29,973 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 9 for LOIs [2019-11-07 01:29:29,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:29:29,979 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 48 for LOIs [2019-11-07 01:29:29,986 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:29:31,261 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:29:31,262 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5, 25] total 47 [2019-11-07 01:29:31,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140865236] [2019-11-07 01:29:31,264 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-11-07 01:29:31,264 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:29:31,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-11-07 01:29:31,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=1918, Unknown=0, NotChecked=0, Total=2162 [2019-11-07 01:29:31,266 INFO L87 Difference]: Start difference. First operand 93 states and 110 transitions. Second operand 47 states. [2019-11-07 01:29:33,649 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 42 [2019-11-07 01:29:34,046 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 42 [2019-11-07 01:29:34,226 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 48 [2019-11-07 01:29:34,501 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 51 [2019-11-07 01:29:34,721 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 42 [2019-11-07 01:29:34,976 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 43 [2019-11-07 01:29:35,157 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 49 [2019-11-07 01:29:35,401 WARN L191 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 55 [2019-11-07 01:29:36,127 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 52 [2019-11-07 01:29:36,310 WARN L191 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 43 [2019-11-07 01:29:36,544 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 42 [2019-11-07 01:29:36,740 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 48 [2019-11-07 01:29:40,243 WARN L191 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 56