/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-crafted/zero_sum_m3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:19:23,287 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:19:23,290 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:19:23,308 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 01:19:23,334 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:19:23,336 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:19:23,338 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:19:23,339 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:19:23,341 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:19:23,342 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:19:23,344 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:19:23,348 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:19:23,352 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:19:23,356 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:19:23,359 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:19:23,360 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:19:23,362 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:19:23,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:19:23,373 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:19:23,374 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:19:23,374 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 01:19:23,404 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:19:23,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:19:23,406 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:19:23,406 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:19:23,406 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:19:23,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:19:23,406 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:19:23,408 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:19:23,409 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:19:23,409 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:19:23,410 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:19:23,410 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:19:23,411 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:19:23,411 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:19:23,411 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:19:23,412 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:19:23,412 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:19:23,412 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:19:23,412 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:19:23,412 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:19:23,413 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:19:23,413 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:19:23,413 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:19:23,414 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:19:23,414 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:19:23,414 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:19:23,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:19:23,415 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:19:23,415 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 01:19:23,728 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:19:23,739 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:19:23,742 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:19:23,743 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:19:23,743 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:19:23,745 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_m3.c [2019-11-07 01:19:23,806 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/328a1a08a/c08c3bd1784b4668ba73ed629ad58c7c/FLAG548468413 [2019-11-07 01:19:24,207 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:19:24,210 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_m3.c [2019-11-07 01:19:24,217 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/328a1a08a/c08c3bd1784b4668ba73ed629ad58c7c/FLAG548468413 [2019-11-07 01:19:24,567 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/328a1a08a/c08c3bd1784b4668ba73ed629ad58c7c [2019-11-07 01:19:24,578 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:19:24,580 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:19:24,581 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:19:24,581 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:19:24,585 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:19:24,586 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,589 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@317c50fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24, skipping insertion in model container [2019-11-07 01:19:24,589 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:24,597 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:19:24,619 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:19:24,881 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:19:24,888 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:19:24,911 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:19:24,929 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:19:24,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24 WrapperNode [2019-11-07 01:19:24,929 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:19:24,930 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:19:24,930 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:19:24,930 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:19:25,031 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,032 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,040 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,041 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,049 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,056 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,058 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (1/1) ... [2019-11-07 01:19:25,065 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:19:25,065 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:19:25,065 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:19:25,065 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:19:25,066 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (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 01:19:25,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:19:25,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:19:25,132 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:19:25,132 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:19:25,132 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:19:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 01:19:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:19:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2019-11-07 01:19:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:19:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:19:25,133 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:19:25,134 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:19:25,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:19:25,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:19:25,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:19:25,642 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:19:25,642 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-07 01:19:25,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:19:25 BoogieIcfgContainer [2019-11-07 01:19:25,644 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:19:25,645 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:19:25,645 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:19:25,649 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:19:25,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:19:24" (1/3) ... [2019-11-07 01:19:25,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68dfec57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:19:25, skipping insertion in model container [2019-11-07 01:19:25,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:19:24" (2/3) ... [2019-11-07 01:19:25,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68dfec57 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:19:25, skipping insertion in model container [2019-11-07 01:19:25,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:19:25" (3/3) ... [2019-11-07 01:19:25,653 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_m3.c [2019-11-07 01:19:25,662 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:19:25,670 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:19:25,683 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:19:25,710 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:19:25,710 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:19:25,710 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:19:25,710 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:19:25,710 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:19:25,711 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:19:25,711 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:19:25,711 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:19:25,729 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-11-07 01:19:25,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:19:25,735 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:25,736 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 01:19:25,737 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:25,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:25,742 INFO L82 PathProgramCache]: Analyzing trace with hash -722993095, now seen corresponding path program 1 times [2019-11-07 01:19:25,752 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:25,753 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990746850] [2019-11-07 01:19:25,753 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:25,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:25,983 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 01:19:25,983 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990746850] [2019-11-07 01:19:25,985 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:25,985 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:19:25,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572909852] [2019-11-07 01:19:25,991 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:19:25,992 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:26,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:19:26,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:19:26,010 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2019-11-07 01:19:26,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:26,121 INFO L93 Difference]: Finished difference Result 48 states and 63 transitions. [2019-11-07 01:19:26,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:19:26,123 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-11-07 01:19:26,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:26,134 INFO L225 Difference]: With dead ends: 48 [2019-11-07 01:19:26,134 INFO L226 Difference]: Without dead ends: 24 [2019-11-07 01:19:26,138 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 01:19:26,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-07 01:19:26,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-07 01:19:26,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-07 01:19:26,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 35 transitions. [2019-11-07 01:19:26,184 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 35 transitions. Word has length 17 [2019-11-07 01:19:26,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:26,184 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 35 transitions. [2019-11-07 01:19:26,184 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:19:26,185 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 35 transitions. [2019-11-07 01:19:26,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-07 01:19:26,186 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:26,186 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:26,186 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:26,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:26,187 INFO L82 PathProgramCache]: Analyzing trace with hash 656684802, now seen corresponding path program 1 times [2019-11-07 01:19:26,187 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:26,188 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938699551] [2019-11-07 01:19:26,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:26,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:26,257 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 01:19:26,259 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938699551] [2019-11-07 01:19:26,260 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:26,260 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:19:26,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468620506] [2019-11-07 01:19:26,265 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:19:26,265 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:26,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:19:26,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:19:26,266 INFO L87 Difference]: Start difference. First operand 24 states and 35 transitions. Second operand 3 states. [2019-11-07 01:19:26,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:26,315 INFO L93 Difference]: Finished difference Result 42 states and 64 transitions. [2019-11-07 01:19:26,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:19:26,316 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-11-07 01:19:26,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:26,317 INFO L225 Difference]: With dead ends: 42 [2019-11-07 01:19:26,317 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:19:26,318 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 01:19:26,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:19:26,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:19:26,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:19:26,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 36 transitions. [2019-11-07 01:19:26,325 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 36 transitions. Word has length 18 [2019-11-07 01:19:26,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:26,326 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 36 transitions. [2019-11-07 01:19:26,326 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:19:26,326 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 36 transitions. [2019-11-07 01:19:26,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-07 01:19:26,327 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:26,327 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:26,327 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:26,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:26,328 INFO L82 PathProgramCache]: Analyzing trace with hash 347884374, now seen corresponding path program 1 times [2019-11-07 01:19:26,328 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:26,328 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714805837] [2019-11-07 01:19:26,329 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:26,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:26,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:19:26,405 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714805837] [2019-11-07 01:19:26,405 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:19:26,406 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:19:26,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964686438] [2019-11-07 01:19:26,406 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:19:26,407 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:26,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:19:26,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:19:26,408 INFO L87 Difference]: Start difference. First operand 25 states and 36 transitions. Second operand 4 states. [2019-11-07 01:19:26,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:26,486 INFO L93 Difference]: Finished difference Result 40 states and 60 transitions. [2019-11-07 01:19:26,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:19:26,486 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-11-07 01:19:26,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:26,487 INFO L225 Difference]: With dead ends: 40 [2019-11-07 01:19:26,488 INFO L226 Difference]: Without dead ends: 25 [2019-11-07 01:19:26,488 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:19:26,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-07 01:19:26,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-07 01:19:26,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-07 01:19:26,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2019-11-07 01:19:26,496 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 19 [2019-11-07 01:19:26,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:26,496 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2019-11-07 01:19:26,497 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:19:26,497 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2019-11-07 01:19:26,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 01:19:26,498 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:26,498 INFO L410 BasicCegarLoop]: trace histogram [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 01:19:26,498 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:26,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:26,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1293658408, now seen corresponding path program 1 times [2019-11-07 01:19:26,499 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:26,499 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470621221] [2019-11-07 01:19:26,499 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:26,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:26,603 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:26,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470621221] [2019-11-07 01:19:26,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069446305] [2019-11-07 01:19:26,604 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 01:19:26,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:26,689 INFO L256 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:19:26,695 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:26,752 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:26,752 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:26,792 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:26,793 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501089447] [2019-11-07 01:19:26,820 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:26,820 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:26,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:26,834 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:26,835 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:26,968 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:27,313 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:27,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:27,319 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:27,565 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:27,565 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-11-07 01:19:27,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462581569] [2019-11-07 01:19:27,567 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 01:19:27,567 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:27,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 01:19:27,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2019-11-07 01:19:27,569 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 17 states. [2019-11-07 01:19:27,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:27,928 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2019-11-07 01:19:27,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-07 01:19:27,929 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2019-11-07 01:19:27,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:27,930 INFO L225 Difference]: With dead ends: 43 [2019-11-07 01:19:27,930 INFO L226 Difference]: Without dead ends: 26 [2019-11-07 01:19:27,931 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2019-11-07 01:19:27,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-07 01:19:27,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-07 01:19:27,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 01:19:27,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2019-11-07 01:19:27,944 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 24 [2019-11-07 01:19:27,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:27,944 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2019-11-07 01:19:27,944 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 01:19:27,945 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2019-11-07 01:19:27,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:19:27,950 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:27,951 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] [2019-11-07 01:19:28,157 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:28,158 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:28,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:28,159 INFO L82 PathProgramCache]: Analyzing trace with hash 14691964, now seen corresponding path program 2 times [2019-11-07 01:19:28,160 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:28,160 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914978396] [2019-11-07 01:19:28,161 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:28,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:28,286 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:19:28,287 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914978396] [2019-11-07 01:19:28,287 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226788486] [2019-11-07 01:19:28,287 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 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 01:19:28,357 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:19:28,357 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:28,359 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:19:28,362 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:28,389 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:19:28,389 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:28,416 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:19:28,417 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202477204] [2019-11-07 01:19:28,419 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:28,419 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:28,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:28,420 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:28,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:28,461 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:28,683 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:28,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:28,691 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:28,971 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:28,971 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 18 [2019-11-07 01:19:28,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045674341] [2019-11-07 01:19:28,973 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:19:28,973 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:28,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:19:28,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:19:28,974 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 18 states. [2019-11-07 01:19:29,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:29,360 INFO L93 Difference]: Finished difference Result 47 states and 63 transitions. [2019-11-07 01:19:29,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-07 01:19:29,361 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2019-11-07 01:19:29,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:29,362 INFO L225 Difference]: With dead ends: 47 [2019-11-07 01:19:29,362 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 01:19:29,363 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2019-11-07 01:19:29,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 01:19:29,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-07 01:19:29,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:19:29,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2019-11-07 01:19:29,373 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 25 [2019-11-07 01:19:29,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:29,373 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2019-11-07 01:19:29,373 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:19:29,373 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2019-11-07 01:19:29,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:19:29,374 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:29,374 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:29,586 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:29,586 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:29,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:29,587 INFO L82 PathProgramCache]: Analyzing trace with hash 93206489, now seen corresponding path program 3 times [2019-11-07 01:19:29,587 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:29,588 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782411378] [2019-11-07 01:19:29,588 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:29,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:30,837 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:30,837 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782411378] [2019-11-07 01:19:30,838 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772014339] [2019-11-07 01:19:30,838 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 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 01:19:30,899 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:30,899 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:30,901 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 58 conjunts are in the unsatisfiable core [2019-11-07 01:19:30,903 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:31,417 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:19:31,417 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:32,329 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:19:32,330 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107678511] [2019-11-07 01:19:32,332 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:32,332 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:32,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:32,333 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:32,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:32,354 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:32,525 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:32,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:32,531 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:33,122 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:33,123 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19, 20, 11] total 54 [2019-11-07 01:19:33,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144618252] [2019-11-07 01:19:33,125 INFO L442 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-11-07 01:19:33,125 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:33,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-11-07 01:19:33,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=2694, Unknown=0, NotChecked=0, Total=2862 [2019-11-07 01:19:33,127 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand 54 states. [2019-11-07 01:19:34,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:34,453 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2019-11-07 01:19:34,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-07 01:19:34,453 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 31 [2019-11-07 01:19:34,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:34,455 INFO L225 Difference]: With dead ends: 53 [2019-11-07 01:19:34,455 INFO L226 Difference]: Without dead ends: 48 [2019-11-07 01:19:34,458 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 49 SyntacticMatches, 16 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=243, Invalid=3917, Unknown=0, NotChecked=0, Total=4160 [2019-11-07 01:19:34,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-07 01:19:34,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2019-11-07 01:19:34,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-07 01:19:34,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 57 transitions. [2019-11-07 01:19:34,466 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 57 transitions. Word has length 31 [2019-11-07 01:19:34,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:34,467 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 57 transitions. [2019-11-07 01:19:34,467 INFO L463 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-11-07 01:19:34,467 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 57 transitions. [2019-11-07 01:19:34,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:19:34,468 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:34,468 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:34,678 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:34,679 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:34,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:34,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1870997086, now seen corresponding path program 4 times [2019-11-07 01:19:34,679 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:34,680 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145606461] [2019-11-07 01:19:34,680 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:34,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:34,766 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:19:34,766 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145606461] [2019-11-07 01:19:34,766 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645224383] [2019-11-07 01:19:34,767 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 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 01:19:34,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:34,835 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:34,837 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:34,879 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:19:34,880 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:34,924 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-07 01:19:34,924 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [518440803] [2019-11-07 01:19:34,926 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:34,926 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:34,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:34,927 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:34,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:34,955 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:35,107 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:35,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:35,120 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:35,373 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2019-11-07 01:19:35,568 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:35,568 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 24 [2019-11-07 01:19:35,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106006641] [2019-11-07 01:19:35,569 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:19:35,570 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:35,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:19:35,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:19:35,571 INFO L87 Difference]: Start difference. First operand 46 states and 57 transitions. Second operand 24 states. [2019-11-07 01:19:36,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:36,050 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2019-11-07 01:19:36,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:19:36,051 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2019-11-07 01:19:36,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:36,052 INFO L225 Difference]: With dead ends: 86 [2019-11-07 01:19:36,052 INFO L226 Difference]: Without dead ends: 47 [2019-11-07 01:19:36,055 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:19:36,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-07 01:19:36,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-07 01:19:36,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-07 01:19:36,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 58 transitions. [2019-11-07 01:19:36,071 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 58 transitions. Word has length 32 [2019-11-07 01:19:36,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:36,072 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 58 transitions. [2019-11-07 01:19:36,072 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:19:36,072 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 58 transitions. [2019-11-07 01:19:36,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-07 01:19:36,073 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:36,073 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:36,281 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:36,281 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:36,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:36,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1952369398, now seen corresponding path program 5 times [2019-11-07 01:19:36,283 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:36,283 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600367159] [2019-11-07 01:19:36,283 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:36,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:36,376 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:36,377 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600367159] [2019-11-07 01:19:36,377 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72164253] [2019-11-07 01:19:36,377 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 01:19:36,458 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:36,458 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:36,459 INFO L256 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-07 01:19:36,461 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:36,533 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:36,542 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:19:36,669 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [406699426] [2019-11-07 01:19:36,676 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:36,676 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:36,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:36,677 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:36,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:36,733 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 25 for LOIs [2019-11-07 01:19:36,880 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:36,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:36,886 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:37,199 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:37,199 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 29 [2019-11-07 01:19:37,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470804022] [2019-11-07 01:19:37,201 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 01:19:37,201 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:37,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 01:19:37,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2019-11-07 01:19:37,202 INFO L87 Difference]: Start difference. First operand 47 states and 58 transitions. Second operand 29 states. [2019-11-07 01:19:37,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:37,871 INFO L93 Difference]: Finished difference Result 70 states and 90 transitions. [2019-11-07 01:19:37,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-07 01:19:37,871 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 33 [2019-11-07 01:19:37,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:37,872 INFO L225 Difference]: With dead ends: 70 [2019-11-07 01:19:37,872 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 01:19:37,873 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:19:37,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 01:19:37,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-07 01:19:37,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-07 01:19:37,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2019-11-07 01:19:37,884 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 33 [2019-11-07 01:19:37,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:37,884 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2019-11-07 01:19:37,884 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 01:19:37,884 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2019-11-07 01:19:37,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-07 01:19:37,886 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:37,886 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:38,087 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:38,087 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:38,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:38,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1194904952, now seen corresponding path program 6 times [2019-11-07 01:19:38,088 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:38,088 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190281155] [2019-11-07 01:19:38,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:38,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:38,825 WARN L191 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 34 [2019-11-07 01:19:38,977 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 37 [2019-11-07 01:19:39,153 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 33 [2019-11-07 01:19:39,278 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 35 [2019-11-07 01:19:39,437 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 40 [2019-11-07 01:19:39,590 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 38 [2019-11-07 01:19:39,725 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 35 [2019-11-07 01:19:39,862 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 36 [2019-11-07 01:19:40,022 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 44 [2019-11-07 01:19:40,545 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 40 [2019-11-07 01:19:40,691 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 37 [2019-11-07 01:19:41,506 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:41,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190281155] [2019-11-07 01:19:41,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825023756] [2019-11-07 01:19:41,507 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 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 01:19:41,579 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:41,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:41,581 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 82 conjunts are in the unsatisfiable core [2019-11-07 01:19:41,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:42,613 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:42,614 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:44,626 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 29 [2019-11-07 01:19:44,751 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-07 01:19:44,752 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130155224] [2019-11-07 01:19:44,759 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:44,760 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:44,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:44,761 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:44,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:44,797 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:44,921 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:44,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:44,925 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:45,860 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:45,860 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 25, 26, 11] total 85 [2019-11-07 01:19:45,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513705499] [2019-11-07 01:19:45,862 INFO L442 AbstractCegarLoop]: Interpolant automaton has 85 states [2019-11-07 01:19:45,862 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:45,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2019-11-07 01:19:45,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=6778, Unknown=0, NotChecked=0, Total=7140 [2019-11-07 01:19:45,865 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 85 states. [2019-11-07 01:19:51,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:51,618 INFO L93 Difference]: Finished difference Result 65 states and 76 transitions. [2019-11-07 01:19:51,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-11-07 01:19:51,619 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 38 [2019-11-07 01:19:51,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:51,620 INFO L225 Difference]: With dead ends: 65 [2019-11-07 01:19:51,620 INFO L226 Difference]: Without dead ends: 60 [2019-11-07 01:19:51,624 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3677 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=738, Invalid=12144, Unknown=0, NotChecked=0, Total=12882 [2019-11-07 01:19:51,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-07 01:19:51,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2019-11-07 01:19:51,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-11-07 01:19:51,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2019-11-07 01:19:51,636 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 38 [2019-11-07 01:19:51,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:51,644 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2019-11-07 01:19:51,644 INFO L463 AbstractCegarLoop]: Interpolant automaton has 85 states. [2019-11-07 01:19:51,644 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2019-11-07 01:19:51,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-07 01:19:51,646 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:51,647 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:51,850 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:51,851 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:51,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:51,852 INFO L82 PathProgramCache]: Analyzing trace with hash -198646311, now seen corresponding path program 7 times [2019-11-07 01:19:51,852 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:51,852 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983254075] [2019-11-07 01:19:51,852 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:51,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:51,954 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:19:51,955 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983254075] [2019-11-07 01:19:51,955 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125371775] [2019-11-07 01:19:51,955 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 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 01:19:52,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:52,059 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:52,061 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:52,120 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:19:52,121 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:52,174 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-07 01:19:52,175 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [434320326] [2019-11-07 01:19:52,176 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:52,176 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:52,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:52,177 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:52,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:52,194 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:52,297 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:52,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:52,302 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:52,568 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:52,569 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 27 [2019-11-07 01:19:52,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567515623] [2019-11-07 01:19:52,570 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 01:19:52,571 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:52,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 01:19:52,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:19:52,572 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand 27 states. [2019-11-07 01:19:53,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:53,112 INFO L93 Difference]: Finished difference Result 108 states and 130 transitions. [2019-11-07 01:19:53,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-07 01:19:53,113 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 39 [2019-11-07 01:19:53,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:53,114 INFO L225 Difference]: With dead ends: 108 [2019-11-07 01:19:53,115 INFO L226 Difference]: Without dead ends: 58 [2019-11-07 01:19:53,116 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 95 SyntacticMatches, 7 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=182, Invalid=1008, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:19:53,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-07 01:19:53,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2019-11-07 01:19:53,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-07 01:19:53,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2019-11-07 01:19:53,124 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 39 [2019-11-07 01:19:53,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:53,125 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2019-11-07 01:19:53,125 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 01:19:53,125 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2019-11-07 01:19:53,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-07 01:19:53,126 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:53,126 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:53,330 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:53,330 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:53,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:53,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1945727483, now seen corresponding path program 8 times [2019-11-07 01:19:53,331 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:53,331 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807643064] [2019-11-07 01:19:53,331 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:53,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:53,414 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-07 01:19:53,414 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807643064] [2019-11-07 01:19:53,415 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194640019] [2019-11-07 01:19:53,415 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 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 01:19:53,499 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:19:53,499 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:53,500 INFO L256 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-07 01:19:53,502 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:19:53,557 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-07 01:19:53,557 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:19:53,612 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-07 01:19:53,613 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1223117676] [2019-11-07 01:19:53,614 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2019-11-07 01:19:53,614 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:19:53,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:19:53,615 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:19:53,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:19:53,637 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 01:19:53,741 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:19:53,747 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 13 for LOIs [2019-11-07 01:19:53,748 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:19:54,060 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:19:54,061 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 27 [2019-11-07 01:19:54,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337453979] [2019-11-07 01:19:54,062 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 01:19:54,063 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:19:54,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 01:19:54,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:19:54,064 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand 27 states. [2019-11-07 01:19:54,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:19:54,651 INFO L93 Difference]: Finished difference Result 85 states and 105 transitions. [2019-11-07 01:19:54,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-07 01:19:54,652 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 40 [2019-11-07 01:19:54,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:19:54,653 INFO L225 Difference]: With dead ends: 85 [2019-11-07 01:19:54,653 INFO L226 Difference]: Without dead ends: 46 [2019-11-07 01:19:54,655 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 97 SyntacticMatches, 8 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=224, Invalid=1182, Unknown=0, NotChecked=0, Total=1406 [2019-11-07 01:19:54,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-07 01:19:54,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-07 01:19:54,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-07 01:19:54,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2019-11-07 01:19:54,661 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 40 [2019-11-07 01:19:54,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:19:54,661 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2019-11-07 01:19:54,661 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 01:19:54,661 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2019-11-07 01:19:54,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:19:54,662 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:19:54,662 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:19:54,866 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:19:54,866 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:19:54,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:19:54,866 INFO L82 PathProgramCache]: Analyzing trace with hash 378271609, now seen corresponding path program 9 times [2019-11-07 01:19:54,867 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:19:54,867 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235970659] [2019-11-07 01:19:54,867 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:19:54,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:19:55,622 WARN L191 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 34 [2019-11-07 01:19:55,831 WARN L191 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 40 [2019-11-07 01:19:56,043 WARN L191 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 40 [2019-11-07 01:19:56,218 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 34 [2019-11-07 01:19:56,389 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 31 [2019-11-07 01:19:56,560 WARN L191 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 42 [2019-11-07 01:19:56,728 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 46 [2019-11-07 01:19:56,878 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 40 [2019-11-07 01:19:57,033 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 38 [2019-11-07 01:19:57,179 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 35 [2019-11-07 01:19:57,355 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 40 [2019-11-07 01:19:57,541 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 44 [2019-11-07 01:19:57,719 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 42 [2019-11-07 01:19:57,881 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 39 [2019-11-07 01:19:58,031 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 36 [2019-11-07 01:19:58,193 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 44 [2019-11-07 01:19:58,378 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 47 [2019-11-07 01:19:59,424 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 1 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:19:59,424 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235970659] [2019-11-07 01:19:59,424 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002920158] [2019-11-07 01:19:59,424 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 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 01:19:59,514 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:19:59,514 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:19:59,516 WARN L254 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 106 conjunts are in the unsatisfiable core [2019-11-07 01:19:59,518 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:01,073 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:20:01,074 INFO L321 TraceCheckSpWp]: Computing backward predicates...