/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/reducercommutativity/sep20-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:39:54,975 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:39:54,977 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:39:54,989 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 04:39:55,006 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:39:55,007 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:39:55,010 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:39:55,011 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:39:55,012 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:39:55,014 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:39:55,015 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:39:55,017 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:39:55,021 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:39:55,022 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:39:55,025 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:39:55,026 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:39:55,028 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 04:39:55,041 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:39:55,045 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:39:55,045 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:39:55,046 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 04:39:55,065 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:39:55,066 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:39:55,067 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:39:55,067 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:39:55,068 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:39:55,068 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:39:55,068 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:39:55,068 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:39:55,068 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:39:55,069 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:39:55,070 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:39:55,070 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:39:55,070 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:39:55,070 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:39:55,071 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:39:55,071 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:39:55,071 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:39:55,071 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:39:55,071 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:39:55,071 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:39:55,072 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:39:55,072 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:39:55,072 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:39:55,072 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:39:55,072 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:39:55,073 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:39:55,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:39:55,073 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:39:55,073 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 04:39:55,361 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:39:55,373 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:39:55,377 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:39:55,378 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:39:55,378 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:39:55,379 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/reducercommutativity/sep20-1.i [2019-11-07 04:39:55,439 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/80ee57845/c5c7b3134ef6488a8753e4cd57ca50c5/FLAGe09eb2155 [2019-11-07 04:39:55,861 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:39:55,862 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/reducercommutativity/sep20-1.i [2019-11-07 04:39:55,868 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/80ee57845/c5c7b3134ef6488a8753e4cd57ca50c5/FLAGe09eb2155 [2019-11-07 04:39:56,269 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/80ee57845/c5c7b3134ef6488a8753e4cd57ca50c5 [2019-11-07 04:39:56,290 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:39:56,292 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:39:56,304 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:39:56,305 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:39:56,308 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:39:56,309 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@641f40a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56, skipping insertion in model container [2019-11-07 04:39:56,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,316 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:39:56,333 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:39:56,512 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:39:56,526 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:39:56,564 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:39:56,669 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:39:56,669 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56 WrapperNode [2019-11-07 04:39:56,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:39:56,671 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:39:56,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:39:56,671 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:39:56,688 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,689 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,733 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,744 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,747 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (1/1) ... [2019-11-07 04:39:56,754 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:39:56,755 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:39:56,755 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:39:56,755 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:39:56,756 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (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 04:39:56,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:39:56,834 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:39:56,834 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2019-11-07 04:39:56,834 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:39:56,834 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:39:56,835 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:39:56,836 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2019-11-07 04:39:56,836 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 04:39:56,836 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:39:56,836 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 04:39:56,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 04:39:56,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 04:39:56,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:39:56,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:39:57,299 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:39:57,300 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 04:39:57,301 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:39:57 BoogieIcfgContainer [2019-11-07 04:39:57,301 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:39:57,302 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:39:57,302 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:39:57,305 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:39:57,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:39:56" (1/3) ... [2019-11-07 04:39:57,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ce884ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:39:57, skipping insertion in model container [2019-11-07 04:39:57,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:39:56" (2/3) ... [2019-11-07 04:39:57,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ce884ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:39:57, skipping insertion in model container [2019-11-07 04:39:57,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:39:57" (3/3) ... [2019-11-07 04:39:57,308 INFO L109 eAbstractionObserver]: Analyzing ICFG sep20-1.i [2019-11-07 04:39:57,316 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:39:57,323 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:39:57,332 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:39:57,354 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:39:57,355 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:39:57,355 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:39:57,355 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:39:57,355 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:39:57,355 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:39:57,355 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:39:57,356 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:39:57,373 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2019-11-07 04:39:57,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 04:39:57,379 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:57,380 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:57,382 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:57,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:57,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1553264816, now seen corresponding path program 1 times [2019-11-07 04:39:57,397 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:57,397 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409994827] [2019-11-07 04:39:57,398 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:57,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:57,567 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-07 04:39:57,568 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409994827] [2019-11-07 04:39:57,569 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:39:57,569 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:39:57,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542393922] [2019-11-07 04:39:57,575 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:39:57,575 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:57,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:39:57,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:39:57,589 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 3 states. [2019-11-07 04:39:57,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:57,627 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2019-11-07 04:39:57,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:39:57,629 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2019-11-07 04:39:57,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:57,638 INFO L225 Difference]: With dead ends: 41 [2019-11-07 04:39:57,638 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 04:39:57,641 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 04:39:57,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 04:39:57,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 04:39:57,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 04:39:57,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-11-07 04:39:57,676 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 24 [2019-11-07 04:39:57,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:57,677 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-11-07 04:39:57,677 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:39:57,677 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-11-07 04:39:57,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 04:39:57,679 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:57,680 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:57,680 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:57,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:57,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1274606805, now seen corresponding path program 1 times [2019-11-07 04:39:57,681 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:57,681 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175623201] [2019-11-07 04:39:57,681 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:57,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:57,767 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 04:39:57,770 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175623201] [2019-11-07 04:39:57,772 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429343934] [2019-11-07 04:39:57,772 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 04:39:57,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:57,850 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-07 04:39:57,857 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:57,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 04:39:57,898 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:57,950 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 04:39:57,950 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-07 04:39:57,951 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 5 [2019-11-07 04:39:57,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512202210] [2019-11-07 04:39:57,953 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:39:57,953 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:57,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:39:57,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 04:39:57,954 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-11-07 04:39:57,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:57,975 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2019-11-07 04:39:57,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:39:57,976 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2019-11-07 04:39:57,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:57,977 INFO L225 Difference]: With dead ends: 33 [2019-11-07 04:39:57,977 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 04:39:57,978 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 04:39:57,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 04:39:57,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 04:39:57,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 04:39:57,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 04:39:57,990 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2019-11-07 04:39:57,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:57,991 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 04:39:57,992 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:39:57,993 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 04:39:57,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 04:39:57,995 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:57,995 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:58,196 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:39:58,197 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:58,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:58,197 INFO L82 PathProgramCache]: Analyzing trace with hash -544560989, now seen corresponding path program 1 times [2019-11-07 04:39:58,198 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:58,199 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255549140] [2019-11-07 04:39:58,201 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:58,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:58,337 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:58,338 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255549140] [2019-11-07 04:39:58,338 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:39:58,338 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:39:58,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270648873] [2019-11-07 04:39:58,340 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:39:58,340 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:39:58,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:39:58,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:39:58,341 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2019-11-07 04:39:58,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:39:58,355 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-07 04:39:58,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:39:58,357 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-11-07 04:39:58,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:39:58,358 INFO L225 Difference]: With dead ends: 31 [2019-11-07 04:39:58,358 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 04:39:58,358 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 04:39:58,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 04:39:58,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 04:39:58,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 04:39:58,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-07 04:39:58,370 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 28 [2019-11-07 04:39:58,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:39:58,376 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-07 04:39:58,376 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:39:58,376 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-07 04:39:58,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 04:39:58,378 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:39:58,378 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:39:58,378 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:39:58,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:39:58,379 INFO L82 PathProgramCache]: Analyzing trace with hash -5957836, now seen corresponding path program 1 times [2019-11-07 04:39:58,379 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:39:58,379 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654514402] [2019-11-07 04:39:58,379 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:39:58,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:58,491 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:58,491 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654514402] [2019-11-07 04:39:58,492 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059468409] [2019-11-07 04:39:58,492 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 04:39:58,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:39:58,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:39:58,569 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:39:58,580 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:58,580 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:39:58,618 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:39:58,618 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1418564755] [2019-11-07 04:39:58,642 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:39:58,643 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:39:58,649 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:39:58,655 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:39:58,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:39:58,793 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:39:59,279 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:39:59,310 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:39:59,312 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:01,974 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:01,975 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 15] total 21 [2019-11-07 04:40:01,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908365630] [2019-11-07 04:40:01,977 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 04:40:01,977 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:01,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 04:40:01,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=358, Unknown=1, NotChecked=0, Total=420 [2019-11-07 04:40:01,978 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 21 states. [2019-11-07 04:40:05,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:05,057 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2019-11-07 04:40:05,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 04:40:05,060 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 29 [2019-11-07 04:40:05,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:05,061 INFO L225 Difference]: With dead ends: 40 [2019-11-07 04:40:05,061 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 04:40:05,070 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=170, Invalid=1088, Unknown=2, NotChecked=0, Total=1260 [2019-11-07 04:40:05,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 04:40:05,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 04:40:05,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 04:40:05,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2019-11-07 04:40:05,090 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 29 [2019-11-07 04:40:05,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:05,091 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2019-11-07 04:40:05,091 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 04:40:05,091 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2019-11-07 04:40:05,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 04:40:05,093 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:05,094 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:05,297 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:05,297 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:05,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:05,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1961836647, now seen corresponding path program 2 times [2019-11-07 04:40:05,298 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:05,298 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850793173] [2019-11-07 04:40:05,298 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:05,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:05,447 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-07 04:40:05,447 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850793173] [2019-11-07 04:40:05,448 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350555350] [2019-11-07 04:40:05,448 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 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 04:40:05,506 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 04:40:05,506 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:40:05,508 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:40:05,511 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:05,527 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 04:40:05,527 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:05,576 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 04:40:05,576 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679875342] [2019-11-07 04:40:05,578 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:05,579 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:05,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:05,579 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:05,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:05,598 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:05,868 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:05,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:05,899 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:08,487 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:08,488 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 15] total 25 [2019-11-07 04:40:08,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209475690] [2019-11-07 04:40:08,489 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 04:40:08,489 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:08,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 04:40:08,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=524, Unknown=1, NotChecked=0, Total=600 [2019-11-07 04:40:08,490 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 25 states. [2019-11-07 04:40:11,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:11,684 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2019-11-07 04:40:11,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 04:40:11,685 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2019-11-07 04:40:11,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:11,686 INFO L225 Difference]: With dead ends: 44 [2019-11-07 04:40:11,686 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 04:40:11,688 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=247, Invalid=1732, Unknown=1, NotChecked=0, Total=1980 [2019-11-07 04:40:11,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 04:40:11,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-07 04:40:11,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-07 04:40:11,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2019-11-07 04:40:11,695 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 32 [2019-11-07 04:40:11,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:11,696 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2019-11-07 04:40:11,696 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 04:40:11,696 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2019-11-07 04:40:11,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-07 04:40:11,697 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:11,697 INFO L410 BasicCegarLoop]: trace histogram [12, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:11,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:11,901 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:11,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:11,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1603069542, now seen corresponding path program 3 times [2019-11-07 04:40:11,902 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:11,902 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904740841] [2019-11-07 04:40:11,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:12,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:12,112 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:40:12,112 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904740841] [2019-11-07 04:40:12,113 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004296913] [2019-11-07 04:40:12,113 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 04:40:12,207 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:40:12,208 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:40:12,209 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-07 04:40:12,220 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:12,242 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:40:12,242 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:12,338 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:40:12,339 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1864748948] [2019-11-07 04:40:12,342 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:12,342 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:12,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:12,344 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:12,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:12,377 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:12,691 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:12,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:12,717 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:17,363 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:17,363 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 15] total 29 [2019-11-07 04:40:17,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781833023] [2019-11-07 04:40:17,365 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 04:40:17,365 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:17,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 04:40:17,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=665, Unknown=2, NotChecked=0, Total=812 [2019-11-07 04:40:17,366 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 29 states. [2019-11-07 04:40:18,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:18,707 INFO L93 Difference]: Finished difference Result 54 states and 68 transitions. [2019-11-07 04:40:18,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 04:40:18,707 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 42 [2019-11-07 04:40:18,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:18,709 INFO L225 Difference]: With dead ends: 54 [2019-11-07 04:40:18,709 INFO L226 Difference]: Without dead ends: 36 [2019-11-07 04:40:18,711 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=406, Invalid=2244, Unknown=2, NotChecked=0, Total=2652 [2019-11-07 04:40:18,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-07 04:40:18,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-07 04:40:18,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 04:40:18,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-11-07 04:40:18,719 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 42 [2019-11-07 04:40:18,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:18,719 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-11-07 04:40:18,720 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 04:40:18,720 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-11-07 04:40:18,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-07 04:40:18,721 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:18,721 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:18,925 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:18,925 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:18,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:18,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1700782945, now seen corresponding path program 4 times [2019-11-07 04:40:18,926 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:18,926 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431353622] [2019-11-07 04:40:18,928 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:19,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:19,182 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:40:19,183 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431353622] [2019-11-07 04:40:19,183 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514518694] [2019-11-07 04:40:19,183 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 04:40:19,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:19,262 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-07 04:40:19,278 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:19,294 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:40:19,294 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:19,496 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-11-07 04:40:19,496 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [17333360] [2019-11-07 04:40:19,498 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:19,498 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:19,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:19,499 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:19,499 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:19,522 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:19,773 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:19,792 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:19,798 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:20,618 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:20,618 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15] total 37 [2019-11-07 04:40:20,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655820211] [2019-11-07 04:40:20,619 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-07 04:40:20,619 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:20,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-07 04:40:20,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1039, Unknown=0, NotChecked=0, Total=1332 [2019-11-07 04:40:20,621 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand 37 states. [2019-11-07 04:40:23,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:23,408 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2019-11-07 04:40:23,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-07 04:40:23,409 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 49 [2019-11-07 04:40:23,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:23,411 INFO L225 Difference]: With dead ends: 62 [2019-11-07 04:40:23,411 INFO L226 Difference]: Without dead ends: 44 [2019-11-07 04:40:23,413 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 121 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=834, Invalid=3722, Unknown=0, NotChecked=0, Total=4556 [2019-11-07 04:40:23,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-07 04:40:23,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-11-07 04:40:23,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-07 04:40:23,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2019-11-07 04:40:23,421 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 49 [2019-11-07 04:40:23,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:23,422 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2019-11-07 04:40:23,422 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-07 04:40:23,422 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2019-11-07 04:40:23,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-07 04:40:23,423 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:23,423 INFO L410 BasicCegarLoop]: trace histogram [20, 12, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:23,627 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:23,627 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:23,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:23,628 INFO L82 PathProgramCache]: Analyzing trace with hash 582890977, now seen corresponding path program 5 times [2019-11-07 04:40:23,628 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:23,628 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721943106] [2019-11-07 04:40:23,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:23,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:23,896 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-07 04:40:23,896 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721943106] [2019-11-07 04:40:23,896 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255132075] [2019-11-07 04:40:23,897 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:23,986 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 04:40:23,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:40:23,990 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 04:40:24,001 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:24,016 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-07 04:40:24,017 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:24,076 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-11-07 04:40:24,076 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710824580] [2019-11-07 04:40:24,078 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:24,079 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:24,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:24,080 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:24,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:24,099 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:24,350 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:24,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:24,372 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:25,005 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:25,005 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 15] total 27 [2019-11-07 04:40:25,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804786272] [2019-11-07 04:40:25,006 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 04:40:25,007 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:25,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 04:40:25,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2019-11-07 04:40:25,008 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 27 states. [2019-11-07 04:40:26,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:26,228 INFO L93 Difference]: Finished difference Result 67 states and 82 transitions. [2019-11-07 04:40:26,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-07 04:40:26,229 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 57 [2019-11-07 04:40:26,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:26,230 INFO L225 Difference]: With dead ends: 67 [2019-11-07 04:40:26,230 INFO L226 Difference]: Without dead ends: 50 [2019-11-07 04:40:26,231 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 617 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=390, Invalid=1866, Unknown=0, NotChecked=0, Total=2256 [2019-11-07 04:40:26,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-07 04:40:26,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-11-07 04:40:26,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-07 04:40:26,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2019-11-07 04:40:26,242 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 57 [2019-11-07 04:40:26,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:26,242 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2019-11-07 04:40:26,242 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 04:40:26,243 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2019-11-07 04:40:26,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-07 04:40:26,244 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:26,244 INFO L410 BasicCegarLoop]: trace histogram [30, 20, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:26,448 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:26,448 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:26,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:26,449 INFO L82 PathProgramCache]: Analyzing trace with hash -971041183, now seen corresponding path program 6 times [2019-11-07 04:40:26,449 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:26,450 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731516441] [2019-11-07 04:40:26,450 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:26,692 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 244 proven. 55 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2019-11-07 04:40:26,693 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731516441] [2019-11-07 04:40:26,693 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692412674] [2019-11-07 04:40:26,693 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:26,818 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:40:26,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:40:26,821 INFO L256 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 04:40:26,824 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:26,844 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 244 proven. 55 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2019-11-07 04:40:26,844 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:27,028 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2019-11-07 04:40:27,028 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [557522953] [2019-11-07 04:40:27,030 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:27,030 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:27,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:27,031 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:27,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:27,058 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:27,271 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:27,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:27,284 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:27,878 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:27,878 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 15] total 37 [2019-11-07 04:40:27,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535515555] [2019-11-07 04:40:27,880 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-07 04:40:27,880 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:27,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-07 04:40:27,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=1038, Unknown=0, NotChecked=0, Total=1332 [2019-11-07 04:40:27,881 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 37 states. [2019-11-07 04:40:31,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:31,857 INFO L93 Difference]: Finished difference Result 83 states and 102 transitions. [2019-11-07 04:40:31,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-07 04:40:31,858 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 75 [2019-11-07 04:40:31,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:31,859 INFO L225 Difference]: With dead ends: 83 [2019-11-07 04:40:31,859 INFO L226 Difference]: Without dead ends: 60 [2019-11-07 04:40:31,861 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 200 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=955, Invalid=3601, Unknown=0, NotChecked=0, Total=4556 [2019-11-07 04:40:31,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-07 04:40:31,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-11-07 04:40:31,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-07 04:40:31,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2019-11-07 04:40:31,871 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 75 [2019-11-07 04:40:31,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:31,871 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2019-11-07 04:40:31,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-07 04:40:31,872 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2019-11-07 04:40:31,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-11-07 04:40:31,873 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:31,874 INFO L410 BasicCegarLoop]: trace histogram [60, 20, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:32,078 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:32,078 INFO L410 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:32,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:32,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1274945055, now seen corresponding path program 7 times [2019-11-07 04:40:32,079 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:32,079 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238644563] [2019-11-07 04:40:32,079 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:32,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:32,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2170 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2019-11-07 04:40:32,314 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238644563] [2019-11-07 04:40:32,314 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038153472] [2019-11-07 04:40:32,314 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:32,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:32,506 INFO L256 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:40:32,510 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:32,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2170 backedges. 886 proven. 1 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2019-11-07 04:40:32,533 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:32,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2170 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2019-11-07 04:40:32,621 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96468689] [2019-11-07 04:40:32,622 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:32,622 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:32,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:32,623 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:32,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:32,637 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:32,834 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:32,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:32,846 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:33,288 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:33,288 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 15] total 21 [2019-11-07 04:40:33,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101706754] [2019-11-07 04:40:33,290 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-07 04:40:33,290 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:33,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-07 04:40:33,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2019-11-07 04:40:33,291 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 21 states. [2019-11-07 04:40:34,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:40:34,164 INFO L93 Difference]: Finished difference Result 91 states and 98 transitions. [2019-11-07 04:40:34,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 04:40:34,164 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 105 [2019-11-07 04:40:34,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:40:34,166 INFO L225 Difference]: With dead ends: 91 [2019-11-07 04:40:34,166 INFO L226 Difference]: Without dead ends: 63 [2019-11-07 04:40:34,168 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=178, Invalid=1082, Unknown=0, NotChecked=0, Total=1260 [2019-11-07 04:40:34,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-11-07 04:40:34,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2019-11-07 04:40:34,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-11-07 04:40:34,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2019-11-07 04:40:34,178 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 105 [2019-11-07 04:40:34,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:40:34,179 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2019-11-07 04:40:34,179 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-07 04:40:34,179 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2019-11-07 04:40:34,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-11-07 04:40:34,181 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:40:34,181 INFO L410 BasicCegarLoop]: trace histogram [60, 20, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:40:34,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:34,387 INFO L410 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:40:34,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:40:34,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1410112048, now seen corresponding path program 8 times [2019-11-07 04:40:34,388 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:40:34,388 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292945674] [2019-11-07 04:40:34,388 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:40:34,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:40:34,918 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2019-11-07 04:40:34,919 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292945674] [2019-11-07 04:40:34,919 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114192896] [2019-11-07 04:40:34,919 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:40:35,049 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-07 04:40:35,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:40:35,051 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 04:40:35,054 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:40:35,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 886 proven. 10 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2019-11-07 04:40:35,074 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:40:35,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2019-11-07 04:40:35,138 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1426225521] [2019-11-07 04:40:35,141 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-11-07 04:40:35,141 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:40:35,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:40:35,142 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:40:35,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:40:35,157 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 04:40:35,401 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 1 for LOIs [2019-11-07 04:40:35,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 04:40:35,414 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:40:37,686 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:40:37,687 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 15] total 27 [2019-11-07 04:40:37,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077031372] [2019-11-07 04:40:37,688 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 04:40:37,689 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:40:37,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 04:40:37,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=584, Unknown=0, NotChecked=0, Total=702 [2019-11-07 04:40:37,690 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand 27 states.