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/forester-heap/dll-queue_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 09:05:09,832 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 09:05:09,834 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 09:05:09,849 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 09:05:09,849 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 09:05:09,850 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 09:05:09,851 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 09:05:09,853 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 09:05:09,855 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 09:05:09,856 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 09:05:09,857 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 09:05:09,857 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 09:05:09,858 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 09:05:09,859 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 09:05:09,860 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 09:05:09,862 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 09:05:09,864 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 09:05:09,866 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 09:05:09,868 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 09:05:09,869 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 09:05:09,872 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 09:05:09,877 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 09:05:09,878 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 09:05:09,878 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 09:05:09,888 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 09:05:09,889 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 09:05:09,889 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 09:05:09,890 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 09:05:09,890 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 09:05:09,890 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 09:05:09,890 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 09:05:09,890 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 09:05:09,890 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 09:05:09,891 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 09:05:09,891 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 09:05:09,892 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 09:05:09,892 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 09:05:09,892 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 09:05:09,892 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 09:05:09,892 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 09:05:09,892 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 09:05:09,893 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 09:05:09,893 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 09:05:09,893 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 09:05:09,893 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 09:05:09,893 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 09:05:09,894 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 09:05:09,894 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 09:05:09,894 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 09:05:09,894 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 09:05:09,894 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 09:05:09,894 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 09:05:09,895 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 09:05:09,895 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 09:05:09,895 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 09:05:09,895 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 09:05:09,895 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 09:05:09,896 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 09:05:09,896 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 09:05:09,896 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 09:05:09,896 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 09:05:09,896 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 09:05:09,897 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 09:05:09,897 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 09:05:09,933 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 09:05:09,947 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 09:05:09,952 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 09:05:09,953 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 09:05:09,954 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 09:05:09,955 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-queue_true-unreach-call_true-valid-memsafety.i [2018-01-21 09:05:10,157 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 09:05:10,162 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 09:05:10,163 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 09:05:10,163 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 09:05:10,169 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 09:05:10,170 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,172 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24dd09ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10, skipping insertion in model container [2018-01-21 09:05:10,173 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,186 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 09:05:10,229 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 09:05:10,359 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 09:05:10,383 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 09:05:10,395 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10 WrapperNode [2018-01-21 09:05:10,395 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 09:05:10,396 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 09:05:10,396 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 09:05:10,396 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 09:05:10,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,416 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,429 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,430 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,436 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,443 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,444 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (1/1) ... [2018-01-21 09:05:10,447 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 09:05:10,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 09:05:10,448 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 09:05:10,448 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 09:05:10,449 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (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 09:05:10,500 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 09:05:10,501 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 09:05:10,501 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 09:05:10,501 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 09:05:10,501 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 09:05:10,501 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 09:05:10,501 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 09:05:10,502 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 09:05:10,502 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 09:05:10,502 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 09:05:10,502 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 09:05:10,502 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 09:05:10,502 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 09:05:10,503 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 09:05:10,503 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 09:05:10,503 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 09:05:10,503 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 09:05:10,956 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 09:05:10,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 09:05:10 BoogieIcfgContainer [2018-01-21 09:05:10,957 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 09:05:10,958 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 09:05:10,958 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 09:05:10,960 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 09:05:10,961 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 09:05:10" (1/3) ... [2018-01-21 09:05:10,962 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11a56864 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 09:05:10, skipping insertion in model container [2018-01-21 09:05:10,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 09:05:10" (2/3) ... [2018-01-21 09:05:10,962 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11a56864 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 09:05:10, skipping insertion in model container [2018-01-21 09:05:10,962 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 09:05:10" (3/3) ... [2018-01-21 09:05:10,964 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-queue_true-unreach-call_true-valid-memsafety.i [2018-01-21 09:05:10,970 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 09:05:10,977 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 09:05:11,020 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:05:11,020 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:05:11,020 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:05:11,021 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:05:11,021 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:05:11,021 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:05:11,021 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:05:11,021 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 09:05:11,022 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:05:11,041 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2018-01-21 09:05:11,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 09:05:11,048 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:11,049 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 09:05:11,050 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 09:05:11,054 INFO L82 PathProgramCache]: Analyzing trace with hash 407902, now seen corresponding path program 1 times [2018-01-21 09:05:11,056 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:11,098 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:11,099 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:11,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:11,099 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:11,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:11,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:11,154 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 09:05:11,160 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:11,169 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:05:11,169 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:05:11,169 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:05:11,169 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:05:11,169 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:05:11,170 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:05:11,170 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:05:11,170 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 09:05:11,170 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:05:11,174 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2018-01-21 09:05:11,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 09:05:11,177 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:11,177 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:11,178 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:11,178 INFO L82 PathProgramCache]: Analyzing trace with hash 2026048430, now seen corresponding path program 1 times [2018-01-21 09:05:11,178 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:11,179 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:11,180 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:11,180 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:11,180 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:11,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:11,214 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:11,357 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 09:05:11,358 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:11,386 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 09:05:11,386 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:11,388 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 09:05:11,399 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 09:05:11,400 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 09:05:11,402 INFO L87 Difference]: Start difference. First operand 114 states. Second operand 2 states. [2018-01-21 09:05:11,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:11,433 INFO L93 Difference]: Finished difference Result 216 states and 326 transitions. [2018-01-21 09:05:11,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 09:05:11,435 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 24 [2018-01-21 09:05:11,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:11,448 INFO L225 Difference]: With dead ends: 216 [2018-01-21 09:05:11,449 INFO L226 Difference]: Without dead ends: 111 [2018-01-21 09:05:11,452 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 09:05:11,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-01-21 09:05:11,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-01-21 09:05:11,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-01-21 09:05:11,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 121 transitions. [2018-01-21 09:05:11,494 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 121 transitions. Word has length 24 [2018-01-21 09:05:11,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:11,494 INFO L432 AbstractCegarLoop]: Abstraction has 111 states and 121 transitions. [2018-01-21 09:05:11,494 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 09:05:11,494 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 121 transitions. [2018-01-21 09:05:11,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 09:05:11,496 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:11,496 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:11,496 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:11,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1986375214, now seen corresponding path program 1 times [2018-01-21 09:05:11,497 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:11,498 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:11,498 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:11,498 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:11,498 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:11,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:11,529 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:11,780 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 09:05:11,780 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:11,780 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 09:05:11,781 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:11,782 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 09:05:11,782 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 09:05:11,783 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-01-21 09:05:11,783 INFO L87 Difference]: Start difference. First operand 111 states and 121 transitions. Second operand 6 states. [2018-01-21 09:05:12,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:12,050 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2018-01-21 09:05:12,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 09:05:12,050 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2018-01-21 09:05:12,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:12,055 INFO L225 Difference]: With dead ends: 202 [2018-01-21 09:05:12,055 INFO L226 Difference]: Without dead ends: 180 [2018-01-21 09:05:12,056 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-01-21 09:05:12,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-01-21 09:05:12,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 170. [2018-01-21 09:05:12,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-01-21 09:05:12,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 184 transitions. [2018-01-21 09:05:12,069 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 184 transitions. Word has length 32 [2018-01-21 09:05:12,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:12,070 INFO L432 AbstractCegarLoop]: Abstraction has 170 states and 184 transitions. [2018-01-21 09:05:12,070 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 09:05:12,070 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 184 transitions. [2018-01-21 09:05:12,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 09:05:12,071 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:12,071 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:12,072 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:12,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1177028588, now seen corresponding path program 1 times [2018-01-21 09:05:12,072 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:12,073 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,073 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:12,073 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,073 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:12,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:12,087 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:12,132 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 09:05:12,132 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:12,132 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 09:05:12,132 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:12,133 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 09:05:12,133 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 09:05:12,133 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 09:05:12,133 INFO L87 Difference]: Start difference. First operand 170 states and 184 transitions. Second operand 4 states. [2018-01-21 09:05:12,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:12,182 INFO L93 Difference]: Finished difference Result 179 states and 193 transitions. [2018-01-21 09:05:12,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 09:05:12,183 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2018-01-21 09:05:12,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:12,186 INFO L225 Difference]: With dead ends: 179 [2018-01-21 09:05:12,186 INFO L226 Difference]: Without dead ends: 174 [2018-01-21 09:05:12,186 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 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 09:05:12,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-01-21 09:05:12,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 172. [2018-01-21 09:05:12,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-01-21 09:05:12,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 186 transitions. [2018-01-21 09:05:12,203 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 186 transitions. Word has length 32 [2018-01-21 09:05:12,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:12,204 INFO L432 AbstractCegarLoop]: Abstraction has 172 states and 186 transitions. [2018-01-21 09:05:12,204 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 09:05:12,204 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 186 transitions. [2018-01-21 09:05:12,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 09:05:12,206 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:12,206 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:12,206 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 09:05:12,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1123303454, now seen corresponding path program 1 times [2018-01-21 09:05:12,207 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:12,207 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,208 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:12,208 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,208 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:12,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:12,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 09:05:12,250 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 09:05:12,256 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:12,261 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:12,261 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 09:05:12,274 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 09:05:12,274 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 09:05:12,275 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 09:05:12,275 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 09:05:12,275 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 09:05:12,275 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 09:05:12,275 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 09:05:12,275 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 09:05:12,275 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 09:05:12,278 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2018-01-21 09:05:12,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 09:05:12,280 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:12,280 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:12,280 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:12,280 INFO L82 PathProgramCache]: Analyzing trace with hash 46800947, now seen corresponding path program 1 times [2018-01-21 09:05:12,281 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:12,281 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,282 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:12,282 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,282 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:12,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:12,292 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:12,306 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 09:05:12,307 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:12,307 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 09:05:12,307 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:12,308 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 09:05:12,308 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 09:05:12,308 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 09:05:12,309 INFO L87 Difference]: Start difference. First operand 114 states. Second operand 2 states. [2018-01-21 09:05:12,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:12,315 INFO L93 Difference]: Finished difference Result 216 states and 326 transitions. [2018-01-21 09:05:12,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 09:05:12,316 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-01-21 09:05:12,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:12,317 INFO L225 Difference]: With dead ends: 216 [2018-01-21 09:05:12,317 INFO L226 Difference]: Without dead ends: 109 [2018-01-21 09:05:12,318 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 09:05:12,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-01-21 09:05:12,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-01-21 09:05:12,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-01-21 09:05:12,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 119 transitions. [2018-01-21 09:05:12,327 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 119 transitions. Word has length 22 [2018-01-21 09:05:12,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:12,327 INFO L432 AbstractCegarLoop]: Abstraction has 109 states and 119 transitions. [2018-01-21 09:05:12,327 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 09:05:12,327 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 119 transitions. [2018-01-21 09:05:12,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 09:05:12,329 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:12,329 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:12,329 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:12,329 INFO L82 PathProgramCache]: Analyzing trace with hash 364077747, now seen corresponding path program 1 times [2018-01-21 09:05:12,329 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:12,330 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,330 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:12,331 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,331 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:12,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:12,344 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:12,468 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 09:05:12,468 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:12,468 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 09:05:12,469 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:12,469 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 09:05:12,470 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 09:05:12,470 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-01-21 09:05:12,470 INFO L87 Difference]: Start difference. First operand 109 states and 119 transitions. Second operand 6 states. [2018-01-21 09:05:12,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:12,655 INFO L93 Difference]: Finished difference Result 198 states and 218 transitions. [2018-01-21 09:05:12,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 09:05:12,656 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2018-01-21 09:05:12,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:12,657 INFO L225 Difference]: With dead ends: 198 [2018-01-21 09:05:12,657 INFO L226 Difference]: Without dead ends: 178 [2018-01-21 09:05:12,658 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-01-21 09:05:12,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-01-21 09:05:12,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 168. [2018-01-21 09:05:12,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-01-21 09:05:12,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 182 transitions. [2018-01-21 09:05:12,668 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 182 transitions. Word has length 30 [2018-01-21 09:05:12,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:12,669 INFO L432 AbstractCegarLoop]: Abstraction has 168 states and 182 transitions. [2018-01-21 09:05:12,669 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 09:05:12,669 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 182 transitions. [2018-01-21 09:05:12,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 09:05:12,670 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:12,671 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:12,671 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:12,671 INFO L82 PathProgramCache]: Analyzing trace with hash 421336049, now seen corresponding path program 1 times [2018-01-21 09:05:12,671 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:12,672 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,672 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:12,672 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,672 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:12,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:12,682 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:12,723 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 09:05:12,724 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 09:05:12,724 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 09:05:12,724 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 09:05:12,724 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 09:05:12,725 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 09:05:12,725 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 09:05:12,725 INFO L87 Difference]: Start difference. First operand 168 states and 182 transitions. Second operand 4 states. [2018-01-21 09:05:12,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 09:05:12,801 INFO L93 Difference]: Finished difference Result 175 states and 189 transitions. [2018-01-21 09:05:12,802 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 09:05:12,802 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 30 [2018-01-21 09:05:12,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 09:05:12,804 INFO L225 Difference]: With dead ends: 175 [2018-01-21 09:05:12,804 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 09:05:12,804 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 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 09:05:12,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 09:05:12,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 170. [2018-01-21 09:05:12,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-01-21 09:05:12,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 184 transitions. [2018-01-21 09:05:12,814 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 184 transitions. Word has length 30 [2018-01-21 09:05:12,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 09:05:12,815 INFO L432 AbstractCegarLoop]: Abstraction has 170 states and 184 transitions. [2018-01-21 09:05:12,815 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 09:05:12,815 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 184 transitions. [2018-01-21 09:05:12,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 09:05:12,816 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 09:05:12,816 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 09:05:12,816 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 09:05:12,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1281511261, now seen corresponding path program 1 times [2018-01-21 09:05:12,817 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 09:05:12,818 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,818 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 09:05:12,818 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 09:05:12,818 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 09:05:12,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 09:05:12,830 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 09:05:12,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 09:05:12,975 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 09:05:12,975 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 09:05:12,977 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 36 with the following transitions: [2018-01-21 09:05:12,979 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [5], [9], [11], [14], [86], [91], [95], [141], [202], [304], [306], [307], [311], [313], [318], [322], [358], [362], [364], [365], [366], [367], [371], [373], [374], [375], [381], [382], [383] [2018-01-21 09:05:13,043 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 09:05:13,043 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