java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 11:50:22,164 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 11:50:22,167 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 11:50:22,187 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 11:50:22,187 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 11:50:22,190 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 11:50:22,192 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 11:50:22,195 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 11:50:22,204 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 11:50:22,205 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 11:50:22,206 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 11:50:22,207 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 11:50:22,208 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 11:50:22,210 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 11:50:22,213 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 11:50:22,214 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 11:50:22,215 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 11:50:22,216 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 11:50:22,220 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 11:50:22,225 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 11:50:22,227 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 11:50:22,230 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 11:50:22,233 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-24 11:50:22,246 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-64bit-Automizer_Default.epf [2018-10-24 11:50:22,272 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 11:50:22,272 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 11:50:22,273 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 11:50:22,273 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-24 11:50:22,274 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-24 11:50:22,274 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-24 11:50:22,274 INFO L133 SettingsManager]: * Use SBE=true [2018-10-24 11:50:22,276 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 11:50:22,276 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 11:50:22,276 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 11:50:22,276 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 11:50:22,277 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 11:50:22,277 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 11:50:22,277 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 11:50:22,277 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 11:50:22,277 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 11:50:22,278 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 11:50:22,278 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 11:50:22,278 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 11:50:22,278 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 11:50:22,278 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 11:50:22,278 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 11:50:22,279 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 11:50:22,279 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-24 11:50:22,279 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 11:50:22,279 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 11:50:22,279 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 11:50:22,280 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 11:50:22,340 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 11:50:22,356 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 11:50:22,360 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 11:50:22,362 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 11:50:22,362 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 11:50:22,363 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call1_true-termination.i [2018-10-24 11:50:22,426 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6531167a5/51d65ed23cb24bc18016f0ac884aee42/FLAG4eefe349b [2018-10-24 11:50:22,933 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 11:50:22,934 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call1_true-termination.i [2018-10-24 11:50:22,941 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6531167a5/51d65ed23cb24bc18016f0ac884aee42/FLAG4eefe349b [2018-10-24 11:50:22,956 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/6531167a5/51d65ed23cb24bc18016f0ac884aee42 [2018-10-24 11:50:22,967 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 11:50:22,969 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 11:50:22,970 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 11:50:22,970 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 11:50:22,974 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 11:50:22,975 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:50:22" (1/1) ... [2018-10-24 11:50:22,978 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cae6dd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:22, skipping insertion in model container [2018-10-24 11:50:22,978 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:50:22" (1/1) ... [2018-10-24 11:50:22,988 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 11:50:23,007 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 11:50:23,216 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:50:23,220 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 11:50:23,240 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 11:50:23,260 INFO L193 MainTranslator]: Completed translation [2018-10-24 11:50:23,260 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23 WrapperNode [2018-10-24 11:50:23,260 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 11:50:23,263 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 11:50:23,263 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 11:50:23,264 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 11:50:23,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,279 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,300 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 11:50:23,300 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 11:50:23,300 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 11:50:23,300 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 11:50:23,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,312 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,312 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,314 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... [2018-10-24 11:50:23,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 11:50:23,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 11:50:23,327 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 11:50:23,327 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 11:50:23,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 11:50:23,464 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 11:50:23,464 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 11:50:23,650 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 11:50:23,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:50:23 BoogieIcfgContainer [2018-10-24 11:50:23,651 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 11:50:23,652 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 11:50:23,652 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 11:50:23,656 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 11:50:23,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:50:22" (1/3) ... [2018-10-24 11:50:23,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ae71474 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:50:23, skipping insertion in model container [2018-10-24 11:50:23,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:50:23" (2/3) ... [2018-10-24 11:50:23,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ae71474 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:50:23, skipping insertion in model container [2018-10-24 11:50:23,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:50:23" (3/3) ... [2018-10-24 11:50:23,660 INFO L112 eAbstractionObserver]: Analyzing ICFG underapprox_false-unreach-call1_true-termination.i [2018-10-24 11:50:23,671 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 11:50:23,678 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 11:50:23,695 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 11:50:23,732 INFO L135 ementStrategyFactory]: Using default assertion order modulation [2018-10-24 11:50:23,732 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 11:50:23,733 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 11:50:23,733 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 11:50:23,733 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 11:50:23,733 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 11:50:23,733 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 11:50:23,733 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 11:50:23,733 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 11:50:23,748 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-10-24 11:50:23,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-24 11:50:23,755 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:23,756 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-10-24 11:50:23,759 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:23,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:23,765 INFO L82 PathProgramCache]: Analyzing trace with hash 889783783, now seen corresponding path program 1 times [2018-10-24 11:50:23,767 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:23,768 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:23,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,824 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:23,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:23,884 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:23,887 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:50:23,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 11:50:23,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 11:50:23,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 11:50:23,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:50:23,907 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 2 states. [2018-10-24 11:50:23,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:23,922 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2018-10-24 11:50:23,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 11:50:23,924 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2018-10-24 11:50:23,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:23,934 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:50:23,934 INFO L226 Difference]: Without dead ends: 8 [2018-10-24 11:50:23,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 11:50:23,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-10-24 11:50:23,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-10-24 11:50:23,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-10-24 11:50:23,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-10-24 11:50:23,973 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-10-24 11:50:23,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:23,973 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-10-24 11:50:23,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 11:50:23,974 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-10-24 11:50:23,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-10-24 11:50:23,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:23,974 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:23,975 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:23,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:23,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1805923659, now seen corresponding path program 1 times [2018-10-24 11:50:23,975 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:23,975 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:23,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,977 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:23,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:23,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:24,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:24,084 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 11:50:24,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 11:50:24,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 11:50:24,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 11:50:24,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 11:50:24,087 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 3 states. [2018-10-24 11:50:24,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:24,138 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-10-24 11:50:24,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 11:50:24,139 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2018-10-24 11:50:24,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:24,140 INFO L225 Difference]: With dead ends: 14 [2018-10-24 11:50:24,141 INFO L226 Difference]: Without dead ends: 10 [2018-10-24 11:50:24,142 INFO L605 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 [2018-10-24 11:50:24,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-10-24 11:50:24,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-10-24 11:50:24,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-10-24 11:50:24,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-10-24 11:50:24,146 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-10-24 11:50:24,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:24,147 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-10-24 11:50:24,147 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 11:50:24,147 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-10-24 11:50:24,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-10-24 11:50:24,148 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:24,148 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:24,151 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:24,151 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:24,152 INFO L82 PathProgramCache]: Analyzing trace with hash 373599493, now seen corresponding path program 1 times [2018-10-24 11:50:24,152 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:24,152 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:24,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:24,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:24,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:24,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:24,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:24,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:24,288 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:24,304 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:24,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:24,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:24,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:24,382 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:24,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-24 11:50:24,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 11:50:24,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 11:50:24,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:50:24,386 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 4 states. [2018-10-24 11:50:24,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:24,456 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-10-24 11:50:24,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 11:50:24,457 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-10-24 11:50:24,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:24,458 INFO L225 Difference]: With dead ends: 16 [2018-10-24 11:50:24,458 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 11:50:24,459 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-24 11:50:24,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 11:50:24,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 11:50:24,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 11:50:24,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 11:50:24,465 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-10-24 11:50:24,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:24,465 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 11:50:24,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 11:50:24,467 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 11:50:24,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 11:50:24,467 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:24,467 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:24,468 INFO L424 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:24,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:24,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1700389313, now seen corresponding path program 2 times [2018-10-24 11:50:24,469 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:24,469 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:24,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:24,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 11:50:24,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:24,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:24,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:24,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:24,606 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:24,616 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-24 11:50:24,641 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-24 11:50:24,642 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:24,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:24,669 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:24,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:24,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-24 11:50:24,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 11:50:24,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 11:50:24,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:50:24,695 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-24 11:50:24,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:24,763 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-10-24 11:50:24,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 11:50:24,763 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-24 11:50:24,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:24,764 INFO L225 Difference]: With dead ends: 18 [2018-10-24 11:50:24,764 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 11:50:24,765 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 11:50:24,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 11:50:24,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 11:50:24,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 11:50:24,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 11:50:24,769 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 11:50:24,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:24,770 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 11:50:24,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 11:50:24,770 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 11:50:24,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 11:50:24,770 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:24,771 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:24,771 INFO L424 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:24,771 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:24,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1938806535, now seen corresponding path program 3 times [2018-10-24 11:50:24,772 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:24,772 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:24,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:24,773 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:24,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:24,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:25,140 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:25,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:25,140 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:25,151 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 11:50:25,171 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 11:50:25,171 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:25,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:25,195 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:25,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:25,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-24 11:50:25,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 11:50:25,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 11:50:25,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:50:25,224 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-24 11:50:25,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:25,271 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-10-24 11:50:25,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 11:50:25,273 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-10-24 11:50:25,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:25,274 INFO L225 Difference]: With dead ends: 20 [2018-10-24 11:50:25,274 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 11:50:25,276 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-24 11:50:25,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 11:50:25,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 11:50:25,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 11:50:25,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 11:50:25,282 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 11:50:25,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:25,282 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 11:50:25,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 11:50:25,283 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 11:50:25,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 11:50:25,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:25,283 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:25,284 INFO L424 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:25,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:25,284 INFO L82 PathProgramCache]: Analyzing trace with hash 870477107, now seen corresponding path program 4 times [2018-10-24 11:50:25,284 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:25,285 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:25,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:25,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:25,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:25,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:25,430 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:25,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:25,431 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:25,440 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 11:50:25,454 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 11:50:25,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:25,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:25,471 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:25,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:25,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-24 11:50:25,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 11:50:25,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 11:50:25,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:50:25,493 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-24 11:50:25,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:25,643 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-10-24 11:50:25,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 11:50:25,646 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-24 11:50:25,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:25,647 INFO L225 Difference]: With dead ends: 22 [2018-10-24 11:50:25,647 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 11:50:25,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-24 11:50:25,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 11:50:25,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 11:50:25,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 11:50:25,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 11:50:25,653 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 11:50:25,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:25,653 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 11:50:25,653 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 11:50:25,654 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 11:50:25,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 11:50:25,654 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:25,654 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:25,655 INFO L424 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:25,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:25,655 INFO L82 PathProgramCache]: Analyzing trace with hash -942372115, now seen corresponding path program 5 times [2018-10-24 11:50:25,655 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:25,656 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:25,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:25,657 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:25,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:25,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 11:50:25,835 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:25,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 11:50:25,836 INFO L225 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 11:50:25,852 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-24 11:50:25,881 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-24 11:50:25,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 11:50:25,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 11:50:25,901 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 11:50:25,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-24 11:50:25,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-24 11:50:25,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 11:50:25,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 11:50:25,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:50:25,925 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 8 states. [2018-10-24 11:50:26,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 11:50:26,073 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 11:50:26,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 11:50:26,077 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-10-24 11:50:26,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 11:50:26,079 INFO L225 Difference]: With dead ends: 24 [2018-10-24 11:50:26,079 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 11:50:26,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-24 11:50:26,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 11:50:26,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 11:50:26,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 11:50:26,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 11:50:26,089 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 11:50:26,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 11:50:26,090 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 11:50:26,090 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 11:50:26,090 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 11:50:26,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 11:50:26,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 11:50:26,091 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1] [2018-10-24 11:50:26,091 INFO L424 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 11:50:26,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 11:50:26,094 INFO L82 PathProgramCache]: Analyzing trace with hash 666247719, now seen corresponding path program 6 times [2018-10-24 11:50:26,094 INFO L225 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-24 11:50:26,094 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-24 11:50:26,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:26,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 11:50:26,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 11:50:26,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 11:50:26,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 11:50:26,177 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-24 11:50:26,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 11:50:26 BoogieIcfgContainer [2018-10-24 11:50:26,200 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 11:50:26,201 INFO L168 Benchmark]: Toolchain (without parser) took 3232.80 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 747.1 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -634.6 MB). Peak memory consumption was 112.5 MB. Max. memory is 7.1 GB. [2018-10-24 11:50:26,203 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 11:50:26,203 INFO L168 Benchmark]: CACSL2BoogieTranslator took 290.87 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 11:50:26,204 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.71 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 11:50:26,205 INFO L168 Benchmark]: Boogie Preprocessor took 26.54 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 11:50:26,205 INFO L168 Benchmark]: RCFGBuilder took 324.23 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 747.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -787.8 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-24 11:50:26,206 INFO L168 Benchmark]: TraceAbstraction took 2547.58 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 142.6 MB). Peak memory consumption was 142.6 MB. Max. memory is 7.1 GB. [2018-10-24 11:50:26,211 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 290.87 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 36.71 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.54 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 324.23 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 747.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -787.8 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2547.58 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 142.6 MB). Peak memory consumption was 142.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L9] unsigned int x = 0; [L10] unsigned int y = 1; [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 [L11] COND TRUE x < 6 [L12] x++ [L13] y *= 2 [L11] COND FALSE !(x < 6) [L15] CALL __VERIFIER_assert(y != 64) [L3] COND TRUE !(cond) [L4] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 12 locations, 1 error locations. UNSAFE Result, 2.4s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 0.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 69 SDtfs, 0 SDslu, 155 SDs, 0 SdLazy, 133 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 95 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=20occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 162 NumberOfCodeBlocks, 162 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 131 ConstructedInterpolants, 0 QuantifiedInterpolants, 7893 SizeOfPredicates, 5 NumberOfNonLiveVariables, 170 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 0/140 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...