java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf -i ../../../trunk/examples/svcomp/memsafety/lockfree-3.3_false-valid-memtrack.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:20:52,454 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:20:52,455 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:20:52,469 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:20:52,469 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:20:52,470 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:20:52,470 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:20:52,472 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:20:52,474 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:20:52,474 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:20:52,475 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:20:52,476 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:20:52,476 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:20:52,478 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:20:52,479 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:20:52,481 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:20:52,483 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:20:52,485 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:20:52,487 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:20:52,488 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:20:52,490 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:20:52,495 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:20:52,496 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:20:52,496 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf [2018-01-21 08:20:52,506 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:20:52,507 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:20:52,507 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:20:52,508 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:20:52,508 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:20:52,508 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:20:52,508 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:20:52,508 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:20:52,509 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:20:52,509 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:20:52,510 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:20:52,510 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:20:52,510 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:20:52,510 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:20:52,510 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:20:52,510 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:20:52,511 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:20:52,511 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:20:52,511 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:20:52,511 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:20:52,511 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:20:52,512 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:20:52,512 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:20:52,512 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:20:52,512 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:20:52,513 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:20:52,513 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:20:52,513 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:20:52,513 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:20:52,513 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:20:52,514 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:20:52,514 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:20:52,514 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:20:52,514 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:20:52,514 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:20:52,514 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:20:52,515 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:20:52,515 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:20:52,516 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:20:52,516 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:20:52,550 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:20:52,563 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:20:52,567 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:20:52,568 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:20:52,569 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:20:52,569 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety/lockfree-3.3_false-valid-memtrack.i [2018-01-21 08:20:52,748 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:20:52,753 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:20:52,754 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:20:52,754 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:20:52,758 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:20:52,759 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:52,761 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6479bd29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52, skipping insertion in model container [2018-01-21 08:20:52,762 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:52,780 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:20:52,821 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:20:52,945 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:20:52,965 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:20:52,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52 WrapperNode [2018-01-21 08:20:52,973 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:20:52,974 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:20:52,974 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:20:52,974 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:20:52,987 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:52,987 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:52,998 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:52,998 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:53,003 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:53,006 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:53,008 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... [2018-01-21 08:20:53,010 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:20:53,010 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:20:53,010 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:20:53,010 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:20:53,011 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (1/1) ... No working directory specified, using /storage/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 [2018-01-21 08:20:53,060 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:20:53,060 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:20:53,061 INFO L136 BoogieDeclarations]: Found implementation of procedure push [2018-01-21 08:20:53,061 INFO L136 BoogieDeclarations]: Found implementation of procedure pop [2018-01-21 08:20:53,061 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:20:53,061 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 08:20:53,061 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 08:20:53,061 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:20:53,062 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:20:53,062 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:20:53,062 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:20:53,062 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:20:53,062 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 08:20:53,062 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 08:20:53,063 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 08:20:53,063 INFO L128 BoogieDeclarations]: Found specification of procedure push [2018-01-21 08:20:53,063 INFO L128 BoogieDeclarations]: Found specification of procedure pop [2018-01-21 08:20:53,063 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:20:53,063 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:20:53,063 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:20:53,352 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:20:53,353 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:20:53 BoogieIcfgContainer [2018-01-21 08:20:53,353 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:20:53,354 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:20:53,354 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:20:53,356 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:20:53,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:20:52" (1/3) ... [2018-01-21 08:20:53,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20c4ca76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:20:53, skipping insertion in model container [2018-01-21 08:20:53,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:20:52" (2/3) ... [2018-01-21 08:20:53,358 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20c4ca76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:20:53, skipping insertion in model container [2018-01-21 08:20:53,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:20:53" (3/3) ... [2018-01-21 08:20:53,359 INFO L105 eAbstractionObserver]: Analyzing ICFG lockfree-3.3_false-valid-memtrack.i [2018-01-21 08:20:53,366 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:20:53,374 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2018-01-21 08:20:53,411 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:20:53,412 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:20:53,412 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:20:53,412 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:20:53,412 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:20:53,412 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:20:53,412 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:20:53,412 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == popErr0EnsuresViolation======== [2018-01-21 08:20:53,413 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:20:53,429 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:20:53,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-01-21 08:20:53,435 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:53,436 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:53,436 INFO L371 AbstractCegarLoop]: === Iteration 1 === [popErr0EnsuresViolation]=== [2018-01-21 08:20:53,440 INFO L82 PathProgramCache]: Analyzing trace with hash 816843792, now seen corresponding path program 1 times [2018-01-21 08:20:53,442 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:53,482 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,482 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:53,482 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,483 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:53,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:53,567 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:53,627 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:53,630 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:53,630 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2018-01-21 08:20:53,630 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:53,634 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:20:53,645 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:20:53,645 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:20:53,647 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:20:53,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:53,753 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2018-01-21 08:20:53,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:20:53,755 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-01-21 08:20:53,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:53,760 INFO L225 Difference]: With dead ends: 75 [2018-01-21 08:20:53,760 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:20:53,763 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:20:53,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:20:53,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:20:53,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:20:53,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:20:53,783 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 14 [2018-01-21 08:20:53,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:53,783 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:20:53,783 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:20:53,783 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:20:53,783 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:20:53,789 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-01-21 08:20:53,817 INFO L401 ceAbstractionStarter]: For program point L681(line 681) no Hoare annotation was computed. [2018-01-21 08:20:53,818 INFO L401 ceAbstractionStarter]: For program point L680(line 680) no Hoare annotation was computed. [2018-01-21 08:20:53,818 INFO L401 ceAbstractionStarter]: For program point popEXIT(lines 660 687) no Hoare annotation was computed. [2018-01-21 08:20:53,818 INFO L401 ceAbstractionStarter]: For program point L663(lines 663 686) no Hoare annotation was computed. [2018-01-21 08:20:53,818 INFO L404 ceAbstractionStarter]: At program point popENTRY(lines 660 687) the Hoare annotation is: true [2018-01-21 08:20:53,818 INFO L401 ceAbstractionStarter]: For program point L682(line 682) no Hoare annotation was computed. [2018-01-21 08:20:53,818 INFO L401 ceAbstractionStarter]: For program point L667(line 667) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L672'(line 672) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L664(line 664) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L682'(line 682) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L668(lines 668 669) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L674(line 674) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L672(line 672) no Hoare annotation was computed. [2018-01-21 08:20:53,819 INFO L401 ceAbstractionStarter]: For program point L671(line 671) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point L675(lines 675 678) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point L675''(lines 675 678) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point L681'(line 681) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point popErr0EnsuresViolation(lines 660 687) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initErr0EnsuresViolation(lines 1 707) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(lines 1 707) no Hoare annotation was computed. [2018-01-21 08:20:53,820 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.initENTRY(lines 1 707) the Hoare annotation is: true [2018-01-21 08:20:53,820 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initFINAL(lines 1 707) no Hoare annotation was computed. [2018-01-21 08:20:53,821 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(lines 1 707) the Hoare annotation is: true [2018-01-21 08:20:53,821 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(lines 1 707) no Hoare annotation was computed. [2018-01-21 08:20:53,821 INFO L404 ceAbstractionStarter]: At program point L1(lines 1 707) the Hoare annotation is: true [2018-01-21 08:20:53,821 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startErr0EnsuresViolation(lines 1 707) no Hoare annotation was computed. [2018-01-21 08:20:53,821 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(lines 1 707) no Hoare annotation was computed. [2018-01-21 08:20:53,821 INFO L404 ceAbstractionStarter]: At program point L694'(line 694) the Hoare annotation is: true [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point L690'(line 690) no Hoare annotation was computed. [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point L697'(line 697) no Hoare annotation was computed. [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point L696'''(lines 696 700) no Hoare annotation was computed. [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point L690'''(line 690) no Hoare annotation was computed. [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point mainErr0EnsuresViolation(lines 688 707) no Hoare annotation was computed. [2018-01-21 08:20:53,822 INFO L404 ceAbstractionStarter]: At program point L692(line 692) the Hoare annotation is: true [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point L691(lines 691 694) no Hoare annotation was computed. [2018-01-21 08:20:53,822 INFO L401 ceAbstractionStarter]: For program point L690(lines 690 695) no Hoare annotation was computed. [2018-01-21 08:20:53,823 INFO L401 ceAbstractionStarter]: For program point L696(lines 696 700) no Hoare annotation was computed. [2018-01-21 08:20:53,823 INFO L401 ceAbstractionStarter]: For program point L696''(lines 696 700) no Hoare annotation was computed. [2018-01-21 08:20:53,823 INFO L404 ceAbstractionStarter]: At program point L694(line 694) the Hoare annotation is: true [2018-01-21 08:20:53,823 INFO L401 ceAbstractionStarter]: For program point mainFINAL(lines 688 707) no Hoare annotation was computed. [2018-01-21 08:20:53,823 INFO L401 ceAbstractionStarter]: For program point L698(line 698) no Hoare annotation was computed. [2018-01-21 08:20:53,823 INFO L401 ceAbstractionStarter]: For program point L697(line 697) no Hoare annotation was computed. [2018-01-21 08:20:53,823 INFO L401 ceAbstractionStarter]: For program point mainEXIT(lines 688 707) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L698'(line 698) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L640(line 640) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L644(line 644) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L643(line 643) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L647''(lines 647 650) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L647(lines 647 650) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L646(line 646) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L633'(line 633) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L404 ceAbstractionStarter]: At program point pushENTRY(lines 629 656) the Hoare annotation is: true [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point L652(line 652) no Hoare annotation was computed. [2018-01-21 08:20:53,824 INFO L401 ceAbstractionStarter]: For program point pushErr0EnsuresViolation(lines 629 656) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L634(line 634) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L633(line 633) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L632(line 632) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L631(lines 631 655) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L638(line 638) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point pushEXIT(lines 629 656) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L637(line 637) no Hoare annotation was computed. [2018-01-21 08:20:53,825 INFO L401 ceAbstractionStarter]: For program point L634'(line 634) no Hoare annotation was computed. [2018-01-21 08:20:53,828 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:20:53,828 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:20:53,828 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:20:53,828 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:20:53,828 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:20:53,828 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:20:53,829 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:20:53,829 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:20:53,829 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:20:53,830 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:20:53,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:20:53,831 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:53,831 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:20:53,831 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:20:53,831 INFO L82 PathProgramCache]: Analyzing trace with hash 169454, now seen corresponding path program 1 times [2018-01-21 08:20:53,831 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:53,832 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,832 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:53,832 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,832 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:53,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:20:53,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:20:53,879 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:20:53,888 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:20:53,901 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:20:53,901 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:20:53,901 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:20:53,901 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:20:53,901 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:20:53,901 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:20:53,902 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:20:53,902 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:20:53,902 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:20:53,904 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:20:53,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-01-21 08:20:53,905 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:53,905 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:53,906 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:20:53,906 INFO L82 PathProgramCache]: Analyzing trace with hash 1316586551, now seen corresponding path program 1 times [2018-01-21 08:20:53,906 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:53,907 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,907 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:53,907 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,908 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:53,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:53,925 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:53,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:53,941 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:53,941 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:20:53,941 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:53,941 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:20:53,942 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:20:53,942 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:20:53,942 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:20:53,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:53,948 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2018-01-21 08:20:53,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:20:53,949 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-01-21 08:20:53,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:53,955 INFO L225 Difference]: With dead ends: 75 [2018-01-21 08:20:53,956 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 08:20:53,956 INFO L525 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 [2018-01-21 08:20:53,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 08:20:53,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-01-21 08:20:53,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 08:20:53,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 74 transitions. [2018-01-21 08:20:53,972 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 74 transitions. Word has length 11 [2018-01-21 08:20:53,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:53,972 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 74 transitions. [2018-01-21 08:20:53,972 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:20:53,972 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 74 transitions. [2018-01-21 08:20:53,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:20:53,973 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:53,974 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:53,974 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:20:53,974 INFO L82 PathProgramCache]: Analyzing trace with hash -2092868013, now seen corresponding path program 1 times [2018-01-21 08:20:53,974 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:53,975 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,975 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:53,975 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:53,975 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:53,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:53,991 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:54,016 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:54,017 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:54,017 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:20:54,017 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:54,019 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:20:54,019 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:20:54,019 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:20:54,020 INFO L87 Difference]: Start difference. First operand 57 states and 74 transitions. Second operand 3 states. [2018-01-21 08:20:54,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:54,045 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2018-01-21 08:20:54,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:20:54,045 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-01-21 08:20:54,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:54,046 INFO L225 Difference]: With dead ends: 69 [2018-01-21 08:20:54,047 INFO L226 Difference]: Without dead ends: 58 [2018-01-21 08:20:54,048 INFO L525 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 [2018-01-21 08:20:54,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-01-21 08:20:54,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-01-21 08:20:54,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 08:20:54,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2018-01-21 08:20:54,056 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 15 [2018-01-21 08:20:54,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:54,056 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2018-01-21 08:20:54,056 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:20:54,056 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2018-01-21 08:20:54,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:20:54,058 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,058 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:54,058 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:20:54,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1392752657, now seen corresponding path program 1 times [2018-01-21 08:20:54,058 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,059 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,059 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,060 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,060 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:20:54,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:20:54,112 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:20:54,120 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:20:54,127 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:20:54,128 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:20:54,138 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:20:54,138 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:20:54,138 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:20:54,138 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:20:54,138 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:20:54,138 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:20:54,139 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:20:54,139 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 08:20:54,139 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:20:54,140 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:20:54,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-01-21 08:20:54,141 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,141 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:54,141 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 08:20:54,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1784608256, now seen corresponding path program 1 times [2018-01-21 08:20:54,141 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,142 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,142 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,142 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,142 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:54,152 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:54,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:54,162 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:54,162 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:20:54,162 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:54,163 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:20:54,163 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:20:54,163 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:20:54,163 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:20:54,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:54,168 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2018-01-21 08:20:54,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:20:54,169 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2018-01-21 08:20:54,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:54,170 INFO L225 Difference]: With dead ends: 75 [2018-01-21 08:20:54,170 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 08:20:54,171 INFO L525 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 [2018-01-21 08:20:54,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 08:20:54,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-01-21 08:20:54,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 08:20:54,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 72 transitions. [2018-01-21 08:20:54,176 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 72 transitions. Word has length 9 [2018-01-21 08:20:54,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:54,176 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 72 transitions. [2018-01-21 08:20:54,176 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:20:54,176 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 72 transitions. [2018-01-21 08:20:54,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-01-21 08:20:54,177 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,177 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:54,177 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 08:20:54,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1548658460, now seen corresponding path program 1 times [2018-01-21 08:20:54,177 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,178 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,178 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,178 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,178 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:54,188 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:54,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:54,223 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:54,223 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:20:54,223 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:54,223 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:20:54,223 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:20:54,224 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:20:54,224 INFO L87 Difference]: Start difference. First operand 55 states and 72 transitions. Second operand 3 states. [2018-01-21 08:20:54,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:54,240 INFO L93 Difference]: Finished difference Result 65 states and 83 transitions. [2018-01-21 08:20:54,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:20:54,241 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-01-21 08:20:54,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:54,242 INFO L225 Difference]: With dead ends: 65 [2018-01-21 08:20:54,242 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 08:20:54,243 INFO L525 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 [2018-01-21 08:20:54,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 08:20:54,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-01-21 08:20:54,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 08:20:54,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2018-01-21 08:20:54,251 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 13 [2018-01-21 08:20:54,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:54,251 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2018-01-21 08:20:54,251 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:20:54,251 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2018-01-21 08:20:54,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-01-21 08:20:54,252 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,252 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:54,253 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 08:20:54,253 INFO L82 PathProgramCache]: Analyzing trace with hash 1605916762, now seen corresponding path program 1 times [2018-01-21 08:20:54,253 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,254 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,254 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:54,264 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:54,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:54,288 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:54,288 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:20:54,288 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:54,288 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:20:54,289 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:20:54,289 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:20:54,289 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand 3 states. [2018-01-21 08:20:54,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:54,362 INFO L93 Difference]: Finished difference Result 65 states and 82 transitions. [2018-01-21 08:20:54,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:20:54,363 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-01-21 08:20:54,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:54,364 INFO L225 Difference]: With dead ends: 65 [2018-01-21 08:20:54,364 INFO L226 Difference]: Without dead ends: 62 [2018-01-21 08:20:54,365 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:20:54,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-01-21 08:20:54,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2018-01-21 08:20:54,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 08:20:54,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 75 transitions. [2018-01-21 08:20:54,372 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 75 transitions. Word has length 13 [2018-01-21 08:20:54,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:54,372 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 75 transitions. [2018-01-21 08:20:54,372 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:20:54,372 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 75 transitions. [2018-01-21 08:20:54,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:20:54,373 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,373 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:20:54,373 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 08:20:54,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1614897922, now seen corresponding path program 1 times [2018-01-21 08:20:54,374 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,375 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,375 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,375 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,375 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:54,388 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:54,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:54,432 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:54,432 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 08:20:54,433 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:54,433 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 08:20:54,433 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 08:20:54,434 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 08:20:54,434 INFO L87 Difference]: Start difference. First operand 58 states and 75 transitions. Second operand 4 states. [2018-01-21 08:20:54,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:54,498 INFO L93 Difference]: Finished difference Result 114 states and 149 transitions. [2018-01-21 08:20:54,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:20:54,499 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-01-21 08:20:54,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:54,500 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:20:54,501 INFO L226 Difference]: Without dead ends: 100 [2018-01-21 08:20:54,501 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:20:54,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-01-21 08:20:54,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 95. [2018-01-21 08:20:54,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-01-21 08:20:54,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 129 transitions. [2018-01-21 08:20:54,516 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 129 transitions. Word has length 19 [2018-01-21 08:20:54,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:54,516 INFO L432 AbstractCegarLoop]: Abstraction has 95 states and 129 transitions. [2018-01-21 08:20:54,516 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 08:20:54,516 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 129 transitions. [2018-01-21 08:20:54,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 08:20:54,519 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,519 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 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, 1] [2018-01-21 08:20:54,519 INFO L371 AbstractCegarLoop]: === Iteration 5 === [mainErr0EnsuresViolation]=== [2018-01-21 08:20:54,520 INFO L82 PathProgramCache]: Analyzing trace with hash -302614467, now seen corresponding path program 1 times [2018-01-21 08:20:54,520 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,520 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,521 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,521 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,521 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:54,539 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:20:54,645 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:20:54,645 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-01-21 08:20:54,645 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:20:54,646 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 08:20:54,646 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 08:20:54,646 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:20:54,646 INFO L87 Difference]: Start difference. First operand 95 states and 129 transitions. Second operand 7 states. [2018-01-21 08:20:54,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:20:54,913 INFO L93 Difference]: Finished difference Result 227 states and 312 transitions. [2018-01-21 08:20:54,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 08:20:54,914 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 37 [2018-01-21 08:20:54,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:20:54,916 INFO L225 Difference]: With dead ends: 227 [2018-01-21 08:20:54,917 INFO L226 Difference]: Without dead ends: 174 [2018-01-21 08:20:54,918 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:20:54,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-01-21 08:20:54,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 150. [2018-01-21 08:20:54,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-01-21 08:20:54,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 207 transitions. [2018-01-21 08:20:54,941 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 207 transitions. Word has length 37 [2018-01-21 08:20:54,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:20:54,941 INFO L432 AbstractCegarLoop]: Abstraction has 150 states and 207 transitions. [2018-01-21 08:20:54,942 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 08:20:54,942 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 207 transitions. [2018-01-21 08:20:54,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 08:20:54,945 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:20:54,945 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1] [2018-01-21 08:20:54,945 INFO L371 AbstractCegarLoop]: === Iteration 6 === [mainErr0EnsuresViolation]=== [2018-01-21 08:20:54,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1718063660, now seen corresponding path program 1 times [2018-01-21 08:20:54,945 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:20:54,946 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,947 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:20:54,947 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:20:54,947 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:20:54,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:20:54,983 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:20:55,086 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:20:55,086 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:20:55,086 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:20:55,087 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 08:20:55,089 INFO L201 CegarAbsIntRunner]: [2], [4], [7], [9], [13], [15], [21], [29], [33], [35], [36], [37], [38], [39], [43], [45], [87], [90], [91], [101], [107], [117], [120], [121], [122], [123], [124], [128], [130], [131], [139], [140], [141], [142], [143] [2018-01-21 08:20:55,135 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:20:55,136 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown