/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-examples/data_structures_set_multi_proc_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:20:02,070 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:20:02,073 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:20:02,093 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:20:02,093 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:20:02,095 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:20:02,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:20:02,109 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:20:02,111 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:20:02,112 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:20:02,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:20:02,114 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:20:02,114 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:20:02,115 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:20:02,116 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:20:02,117 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:20:02,118 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:20:02,119 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:20:02,120 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:20:02,122 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:20:02,123 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:20:02,124 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:20:02,125 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:20:02,126 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:20:02,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:20:02,135 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:20:02,136 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:20:02,137 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:20:02,138 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 01:20:02,157 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:20:02,158 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:20:02,160 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:20:02,160 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:20:02,160 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:20:02,160 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:20:02,161 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:20:02,161 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:20:02,161 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:20:02,161 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:20:02,162 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:20:02,163 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:20:02,163 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:20:02,163 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:20:02,163 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:20:02,164 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:20:02,164 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:20:02,164 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:20:02,164 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:20:02,164 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:20:02,165 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:20:02,165 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:20:02,165 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:20:02,165 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:20:02,166 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:20:02,166 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:20:02,166 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:20:02,166 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:20:02,166 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 01:20:02,449 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:20:02,466 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:20:02,469 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:20:02,470 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:20:02,471 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:20:02,471 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_ground-2.i [2019-11-07 01:20:02,537 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42e7251f7/7e8ab13ff2814eecac2512d96197ecf7/FLAG0111fba77 [2019-11-07 01:20:02,994 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:20:02,995 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_ground-2.i [2019-11-07 01:20:03,002 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42e7251f7/7e8ab13ff2814eecac2512d96197ecf7/FLAG0111fba77 [2019-11-07 01:20:03,381 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/42e7251f7/7e8ab13ff2814eecac2512d96197ecf7 [2019-11-07 01:20:03,408 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:20:03,412 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:20:03,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:20:03,419 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:20:03,424 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:20:03,426 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:03,434 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68dfb264 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03, skipping insertion in model container [2019-11-07 01:20:03,434 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:03,454 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:20:03,500 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:20:03,800 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:20:03,810 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:20:03,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:20:03,949 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:20:03,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03 WrapperNode [2019-11-07 01:20:03,950 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:20:03,950 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:20:03,950 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:20:03,951 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:20:03,961 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:03,961 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:03,974 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:03,975 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:03,992 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:04,000 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:04,002 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (1/1) ... [2019-11-07 01:20:04,005 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:20:04,005 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:20:04,006 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:20:04,006 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:20:04,007 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (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 01:20:04,063 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:20:04,064 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:20:04,064 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:20:04,064 INFO L138 BoogieDeclarations]: Found implementation of procedure insert [2019-11-07 01:20:04,064 INFO L138 BoogieDeclarations]: Found implementation of procedure elem_exists [2019-11-07 01:20:04,065 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:20:04,065 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:20:04,065 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:20:04,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:20:04,066 INFO L130 BoogieDeclarations]: Found specification of procedure insert [2019-11-07 01:20:04,066 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:20:04,066 INFO L130 BoogieDeclarations]: Found specification of procedure elem_exists [2019-11-07 01:20:04,066 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:20:04,066 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:20:04,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:20:04,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:20:04,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:20:04,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:20:04,558 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:20:04,558 INFO L284 CfgBuilder]: Removed 8 assume(true) statements. [2019-11-07 01:20:04,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:20:04 BoogieIcfgContainer [2019-11-07 01:20:04,560 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:20:04,561 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:20:04,561 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:20:04,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:20:04,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:20:03" (1/3) ... [2019-11-07 01:20:04,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4591f478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:20:04, skipping insertion in model container [2019-11-07 01:20:04,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:03" (2/3) ... [2019-11-07 01:20:04,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4591f478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:20:04, skipping insertion in model container [2019-11-07 01:20:04,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:20:04" (3/3) ... [2019-11-07 01:20:04,567 INFO L109 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_ground-2.i [2019-11-07 01:20:04,576 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:20:04,584 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:20:04,595 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:20:04,618 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:20:04,618 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:20:04,618 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:20:04,618 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:20:04,619 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:20:04,619 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:20:04,619 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:20:04,619 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:20:04,634 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2019-11-07 01:20:04,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:20:04,640 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:04,641 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:04,643 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:04,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:04,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1511676476, now seen corresponding path program 1 times [2019-11-07 01:20:04,657 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:04,657 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310484661] [2019-11-07 01:20:04,658 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:04,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:04,824 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 01:20:04,824 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310484661] [2019-11-07 01:20:04,825 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:20:04,826 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:20:04,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224361930] [2019-11-07 01:20:04,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:20:04,832 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:04,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:20:04,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:20:04,850 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2019-11-07 01:20:04,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:04,950 INFO L93 Difference]: Finished difference Result 88 states and 125 transitions. [2019-11-07 01:20:04,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:20:04,952 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 01:20:04,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:04,966 INFO L225 Difference]: With dead ends: 88 [2019-11-07 01:20:04,966 INFO L226 Difference]: Without dead ends: 52 [2019-11-07 01:20:04,973 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 01:20:04,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-07 01:20:05,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 36. [2019-11-07 01:20:05,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-07 01:20:05,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2019-11-07 01:20:05,046 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 12 [2019-11-07 01:20:05,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:05,047 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2019-11-07 01:20:05,047 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:20:05,047 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2019-11-07 01:20:05,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:20:05,052 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:05,052 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:05,053 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:05,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:05,053 INFO L82 PathProgramCache]: Analyzing trace with hash 1775930285, now seen corresponding path program 1 times [2019-11-07 01:20:05,054 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:05,054 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001363305] [2019-11-07 01:20:05,055 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:05,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:05,180 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 01:20:05,181 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001363305] [2019-11-07 01:20:05,181 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:20:05,181 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:20:05,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041515517] [2019-11-07 01:20:05,184 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:20:05,184 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:05,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:20:05,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:20:05,185 INFO L87 Difference]: Start difference. First operand 36 states and 46 transitions. Second operand 5 states. [2019-11-07 01:20:05,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:05,271 INFO L93 Difference]: Finished difference Result 70 states and 91 transitions. [2019-11-07 01:20:05,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:20:05,272 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-11-07 01:20:05,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:05,273 INFO L225 Difference]: With dead ends: 70 [2019-11-07 01:20:05,274 INFO L226 Difference]: Without dead ends: 40 [2019-11-07 01:20:05,275 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:20:05,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-07 01:20:05,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2019-11-07 01:20:05,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-07 01:20:05,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2019-11-07 01:20:05,283 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 13 [2019-11-07 01:20:05,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:05,284 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2019-11-07 01:20:05,284 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:20:05,284 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2019-11-07 01:20:05,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-07 01:20:05,285 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:05,285 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, 1, 1, 1, 1, 1] [2019-11-07 01:20:05,285 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:05,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:05,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1000416666, now seen corresponding path program 1 times [2019-11-07 01:20:05,286 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:05,286 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795755003] [2019-11-07 01:20:05,287 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:05,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:05,344 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 01:20:05,344 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795755003] [2019-11-07 01:20:05,344 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:20:05,345 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:20:05,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235669500] [2019-11-07 01:20:05,345 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:20:05,346 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:05,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:20:05,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:20:05,347 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand 3 states. [2019-11-07 01:20:05,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:05,371 INFO L93 Difference]: Finished difference Result 76 states and 96 transitions. [2019-11-07 01:20:05,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:20:05,371 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2019-11-07 01:20:05,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:05,373 INFO L225 Difference]: With dead ends: 76 [2019-11-07 01:20:05,373 INFO L226 Difference]: Without dead ends: 47 [2019-11-07 01:20:05,374 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 01:20:05,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-07 01:20:05,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2019-11-07 01:20:05,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-07 01:20:05,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 48 transitions. [2019-11-07 01:20:05,383 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 48 transitions. Word has length 29 [2019-11-07 01:20:05,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:05,383 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 48 transitions. [2019-11-07 01:20:05,384 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:20:05,384 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 48 transitions. [2019-11-07 01:20:05,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-07 01:20:05,385 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:05,385 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, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:05,385 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:05,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:05,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1697925591, now seen corresponding path program 1 times [2019-11-07 01:20:05,386 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:05,386 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291587312] [2019-11-07 01:20:05,387 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:05,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:05,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:20:05,466 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291587312] [2019-11-07 01:20:05,466 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [622491041] [2019-11-07 01:20:05,467 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 01:20:05,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:05,558 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:20:05,567 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:05,610 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:20:05,610 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:05,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 01:20:05,651 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [994622136] [2019-11-07 01:20:05,675 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2019-11-07 01:20:05,675 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:05,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:05,686 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:05,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:05,817 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:06,782 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 7 for LOIs [2019-11-07 01:20:06,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:06,786 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 34 for LOIs [2019-11-07 01:20:06,793 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:07,158 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 30 [2019-11-07 01:20:07,807 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:20:07,807 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [4, 4, 4] total 24 [2019-11-07 01:20:07,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705567218] [2019-11-07 01:20:07,809 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-07 01:20:07,809 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:07,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-07 01:20:07,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:20:07,812 INFO L87 Difference]: Start difference. First operand 39 states and 48 transitions. Second operand 20 states. [2019-11-07 01:20:08,220 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 39 [2019-11-07 01:20:08,618 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 41 [2019-11-07 01:20:09,606 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 41 [2019-11-07 01:20:10,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:10,063 INFO L93 Difference]: Finished difference Result 110 states and 144 transitions. [2019-11-07 01:20:10,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-07 01:20:10,064 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 30 [2019-11-07 01:20:10,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:10,067 INFO L225 Difference]: With dead ends: 110 [2019-11-07 01:20:10,067 INFO L226 Difference]: Without dead ends: 81 [2019-11-07 01:20:10,069 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=381, Invalid=1689, Unknown=0, NotChecked=0, Total=2070 [2019-11-07 01:20:10,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-11-07 01:20:10,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 62. [2019-11-07 01:20:10,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-11-07 01:20:10,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 78 transitions. [2019-11-07 01:20:10,095 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 78 transitions. Word has length 30 [2019-11-07 01:20:10,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:10,096 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 78 transitions. [2019-11-07 01:20:10,096 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-07 01:20:10,096 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 78 transitions. [2019-11-07 01:20:10,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:20:10,098 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:10,098 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:10,302 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:10,302 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:10,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:10,303 INFO L82 PathProgramCache]: Analyzing trace with hash 545937229, now seen corresponding path program 1 times [2019-11-07 01:20:10,303 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:10,304 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715345937] [2019-11-07 01:20:10,304 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:10,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:10,445 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:20:10,446 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715345937] [2019-11-07 01:20:10,446 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981048147] [2019-11-07 01:20:10,446 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:10,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:10,517 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:20:10,522 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:10,562 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:20:10,563 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:10,602 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:20:10,602 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2121376848] [2019-11-07 01:20:10,604 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2019-11-07 01:20:10,605 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:10,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:10,605 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:10,608 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:10,637 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:11,359 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 7 for LOIs [2019-11-07 01:20:11,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:11,364 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 34 for LOIs [2019-11-07 01:20:11,370 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:12,587 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:20:12,588 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [5, 4, 4] total 27 [2019-11-07 01:20:12,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838557847] [2019-11-07 01:20:12,589 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-07 01:20:12,589 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:12,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-07 01:20:12,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=590, Unknown=0, NotChecked=0, Total=702 [2019-11-07 01:20:12,590 INFO L87 Difference]: Start difference. First operand 62 states and 78 transitions. Second operand 20 states. [2019-11-07 01:20:13,093 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 40 [2019-11-07 01:20:13,598 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2019-11-07 01:20:13,938 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 39 [2019-11-07 01:20:14,676 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 37 [2019-11-07 01:20:15,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:15,225 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2019-11-07 01:20:15,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:20:15,226 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 32 [2019-11-07 01:20:15,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:15,228 INFO L225 Difference]: With dead ends: 93 [2019-11-07 01:20:15,228 INFO L226 Difference]: Without dead ends: 79 [2019-11-07 01:20:15,230 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=400, Invalid=2050, Unknown=0, NotChecked=0, Total=2450 [2019-11-07 01:20:15,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-11-07 01:20:15,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 60. [2019-11-07 01:20:15,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-07 01:20:15,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 75 transitions. [2019-11-07 01:20:15,242 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 75 transitions. Word has length 32 [2019-11-07 01:20:15,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:15,243 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 75 transitions. [2019-11-07 01:20:15,243 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-07 01:20:15,243 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 75 transitions. [2019-11-07 01:20:15,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-07 01:20:15,245 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:15,245 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:15,457 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:15,458 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:15,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:15,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1911824755, now seen corresponding path program 1 times [2019-11-07 01:20:15,458 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:15,458 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101557380] [2019-11-07 01:20:15,459 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:15,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:15,578 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:20:15,578 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101557380] [2019-11-07 01:20:15,578 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:20:15,578 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 01:20:15,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032097941] [2019-11-07 01:20:15,579 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:20:15,579 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:15,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:20:15,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:20:15,580 INFO L87 Difference]: Start difference. First operand 60 states and 75 transitions. Second operand 4 states. [2019-11-07 01:20:15,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:15,594 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2019-11-07 01:20:15,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:20:15,595 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 44 [2019-11-07 01:20:15,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:15,596 INFO L225 Difference]: With dead ends: 113 [2019-11-07 01:20:15,596 INFO L226 Difference]: Without dead ends: 70 [2019-11-07 01:20:15,597 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:20:15,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-07 01:20:15,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2019-11-07 01:20:15,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-07 01:20:15,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 87 transitions. [2019-11-07 01:20:15,608 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 87 transitions. Word has length 44 [2019-11-07 01:20:15,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:15,609 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 87 transitions. [2019-11-07 01:20:15,609 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:20:15,609 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 87 transitions. [2019-11-07 01:20:15,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:20:15,611 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:15,611 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:15,611 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:15,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:15,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1980989535, now seen corresponding path program 1 times [2019-11-07 01:20:15,612 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:15,612 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513747583] [2019-11-07 01:20:15,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:15,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:15,669 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 01:20:15,669 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513747583] [2019-11-07 01:20:15,670 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166484055] [2019-11-07 01:20:15,670 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:15,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:15,755 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:20:15,757 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:15,777 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:20:15,777 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:15,806 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-07 01:20:15,807 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2103646948] [2019-11-07 01:20:15,809 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-11-07 01:20:15,809 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:15,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:15,811 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:15,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:15,827 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:16,308 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:20:16,314 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 3 for LOIs [2019-11-07 01:20:16,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:16,317 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 33 for LOIs [2019-11-07 01:20:16,354 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:18,401 WARN L191 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 30 [2019-11-07 01:20:18,790 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 33 [2019-11-07 01:20:19,627 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:19,628 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4, 24] total 32 [2019-11-07 01:20:19,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937809494] [2019-11-07 01:20:19,629 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-07 01:20:19,629 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:19,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-07 01:20:19,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=842, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:20:19,630 INFO L87 Difference]: Start difference. First operand 70 states and 87 transitions. Second operand 32 states. [2019-11-07 01:20:22,062 WARN L191 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 41 [2019-11-07 01:20:25,312 WARN L191 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 50 [2019-11-07 01:20:26,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:26,216 INFO L93 Difference]: Finished difference Result 239 states and 313 transitions. [2019-11-07 01:20:26,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2019-11-07 01:20:26,216 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-11-07 01:20:26,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:26,219 INFO L225 Difference]: With dead ends: 239 [2019-11-07 01:20:26,219 INFO L226 Difference]: Without dead ends: 176 [2019-11-07 01:20:26,222 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1694 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=950, Invalid=5370, Unknown=0, NotChecked=0, Total=6320 [2019-11-07 01:20:26,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2019-11-07 01:20:26,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 103. [2019-11-07 01:20:26,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-11-07 01:20:26,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 127 transitions. [2019-11-07 01:20:26,243 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 127 transitions. Word has length 45 [2019-11-07 01:20:26,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:26,243 INFO L462 AbstractCegarLoop]: Abstraction has 103 states and 127 transitions. [2019-11-07 01:20:26,243 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-07 01:20:26,243 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 127 transitions. [2019-11-07 01:20:26,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-11-07 01:20:26,247 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:26,248 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:26,455 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:26,456 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:26,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:26,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1595088869, now seen corresponding path program 1 times [2019-11-07 01:20:26,457 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:26,457 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376805833] [2019-11-07 01:20:26,457 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:26,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:26,584 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-11-07 01:20:26,584 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376805833] [2019-11-07 01:20:26,585 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917577482] [2019-11-07 01:20:26,586 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:26,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:26,685 INFO L256 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:20:26,694 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:26,703 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-11-07 01:20:26,704 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:26,787 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-11-07 01:20:26,787 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1596299906] [2019-11-07 01:20:26,791 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-11-07 01:20:26,791 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:26,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:26,792 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:26,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:26,813 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:27,475 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:20:27,482 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 3 for LOIs [2019-11-07 01:20:27,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:27,486 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 25 for LOIs [2019-11-07 01:20:27,532 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:29,581 WARN L191 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 30 [2019-11-07 01:20:30,555 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:30,555 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 24] total 35 [2019-11-07 01:20:30,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328950179] [2019-11-07 01:20:30,556 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 01:20:30,556 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:30,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 01:20:30,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=926, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:20:30,558 INFO L87 Difference]: Start difference. First operand 103 states and 127 transitions. Second operand 35 states. [2019-11-07 01:20:32,290 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 39 [2019-11-07 01:20:34,721 WARN L191 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 50 [2019-11-07 01:20:35,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:35,160 INFO L93 Difference]: Finished difference Result 257 states and 332 transitions. [2019-11-07 01:20:35,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-11-07 01:20:35,161 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 60 [2019-11-07 01:20:35,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:35,163 INFO L225 Difference]: With dead ends: 257 [2019-11-07 01:20:35,163 INFO L226 Difference]: Without dead ends: 164 [2019-11-07 01:20:35,166 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 161 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1392 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=865, Invalid=3557, Unknown=0, NotChecked=0, Total=4422 [2019-11-07 01:20:35,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2019-11-07 01:20:35,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 109. [2019-11-07 01:20:35,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2019-11-07 01:20:35,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 133 transitions. [2019-11-07 01:20:35,188 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 133 transitions. Word has length 60 [2019-11-07 01:20:35,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:35,188 INFO L462 AbstractCegarLoop]: Abstraction has 109 states and 133 transitions. [2019-11-07 01:20:35,189 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 01:20:35,189 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 133 transitions. [2019-11-07 01:20:35,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-11-07 01:20:35,191 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:35,191 INFO L410 BasicCegarLoop]: trace histogram [10, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:35,394 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:35,395 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:35,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:35,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1331040891, now seen corresponding path program 2 times [2019-11-07 01:20:35,395 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:35,396 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811445922] [2019-11-07 01:20:35,396 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:35,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:35,560 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2019-11-07 01:20:35,560 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811445922] [2019-11-07 01:20:35,560 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664960823] [2019-11-07 01:20:35,560 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 01:20:35,669 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:20:35,669 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:20:35,670 INFO L256 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:20:35,674 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:35,762 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-11-07 01:20:35,762 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:35,843 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-11-07 01:20:35,843 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1963091511] [2019-11-07 01:20:35,848 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2019-11-07 01:20:35,848 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:35,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:35,849 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:35,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:35,866 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:36,467 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2019-11-07 01:20:36,472 INFO L197 IcfgInterpreter]: Interpreting procedure insert with input of size 3 for LOIs [2019-11-07 01:20:36,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:36,476 INFO L197 IcfgInterpreter]: Interpreting procedure elem_exists with input of size 27 for LOIs [2019-11-07 01:20:36,514 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:38,558 WARN L191 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 30 [2019-11-07 01:20:39,638 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:39,638 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 24] total 43 [2019-11-07 01:20:39,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242249562] [2019-11-07 01:20:39,640 INFO L442 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-11-07 01:20:39,640 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:39,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-11-07 01:20:39,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1498, Unknown=0, NotChecked=0, Total=1806 [2019-11-07 01:20:39,642 INFO L87 Difference]: Start difference. First operand 109 states and 133 transitions. Second operand 43 states. [2019-11-07 01:20:41,737 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 39 [2019-11-07 01:20:42,295 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 40 [2019-11-07 01:20:42,464 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:20:42,818 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 41 [2019-11-07 01:20:43,382 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 42 [2019-11-07 01:20:43,595 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2019-11-07 01:20:43,893 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 42