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_precise.epf -i ../../../trunk/examples/svcomp/list-ext-properties/test-0504_1_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 05:57:02,981 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 05:57:02,983 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 05:57:02,998 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 05:57:02,998 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 05:57:02,998 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 05:57:02,999 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 05:57:03,000 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 05:57:03,002 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 05:57:03,003 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 05:57:03,003 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 05:57:03,003 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 05:57:03,004 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 05:57:03,005 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 05:57:03,006 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 05:57:03,008 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 05:57:03,010 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 05:57:03,012 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 05:57:03,014 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 05:57:03,015 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 05:57:03,017 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 05:57:03,022 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 05:57:03,023 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 05:57:03,023 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_precise.epf [2018-01-21 05:57:03,033 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 05:57:03,033 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 05:57:03,034 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 05:57:03,034 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 05:57:03,034 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 05:57:03,034 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 05:57:03,035 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 05:57:03,035 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 05:57:03,035 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 05:57:03,036 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 05:57:03,036 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 05:57:03,036 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 05:57:03,036 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 05:57:03,036 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 05:57:03,037 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 05:57:03,037 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 05:57:03,037 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 05:57:03,037 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 05:57:03,037 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 05:57:03,037 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 05:57:03,038 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 05:57:03,038 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 05:57:03,038 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 05:57:03,038 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 05:57:03,038 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 05:57:03,038 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 05:57:03,039 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 05:57:03,039 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 05:57:03,039 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 05:57:03,039 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 05:57:03,039 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 05:57:03,040 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 05:57:03,040 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 05:57:03,040 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 05:57:03,040 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 05:57:03,040 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 05:57:03,041 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 05:57:03,041 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 05:57:03,042 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 05:57:03,076 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 05:57:03,089 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 05:57:03,093 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 05:57:03,094 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 05:57:03,095 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 05:57:03,096 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext-properties/test-0504_1_true-valid-memsafety.i [2018-01-21 05:57:03,282 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 05:57:03,287 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 05:57:03,307 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 05:57:03,307 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 05:57:03,312 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 05:57:03,313 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,316 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61b09386 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03, skipping insertion in model container [2018-01-21 05:57:03,316 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,334 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 05:57:03,374 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 05:57:03,490 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 05:57:03,512 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 05:57:03,521 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03 WrapperNode [2018-01-21 05:57:03,522 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 05:57:03,522 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 05:57:03,522 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 05:57:03,523 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 05:57:03,537 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,537 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,547 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,547 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,554 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,558 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (1/1) ... [2018-01-21 05:57:03,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 05:57:03,560 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 05:57:03,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 05:57:03,561 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 05:57:03,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (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 05:57:03,609 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 05:57:03,609 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 05:57:03,609 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 05:57:03,609 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 05:57:03,610 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 05:57:03,611 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 05:57:03,611 INFO L128 BoogieDeclarations]: Found specification of procedure abort [2018-01-21 05:57:03,611 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 05:57:03,611 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 05:57:03,611 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 05:57:03,611 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 05:57:03,886 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 05:57:03,886 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 05:57:03 BoogieIcfgContainer [2018-01-21 05:57:03,887 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 05:57:03,888 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 05:57:03,888 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 05:57:03,890 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 05:57:03,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 05:57:03" (1/3) ... [2018-01-21 05:57:03,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ec16a27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 05:57:03, skipping insertion in model container [2018-01-21 05:57:03,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:57:03" (2/3) ... [2018-01-21 05:57:03,893 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ec16a27 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 05:57:03, skipping insertion in model container [2018-01-21 05:57:03,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 05:57:03" (3/3) ... [2018-01-21 05:57:03,895 INFO L105 eAbstractionObserver]: Analyzing ICFG test-0504_1_true-valid-memsafety.i [2018-01-21 05:57:03,904 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 05:57:03,912 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 05:57:03,958 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:57:03,959 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:57:03,959 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:57:03,959 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:57:03,959 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:57:03,959 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:57:03,960 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:57:03,960 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 05:57:03,961 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:57:03,981 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states. [2018-01-21 05:57:03,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 05:57:03,986 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:03,987 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 05:57:03,987 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 05:57:03,991 INFO L82 PathProgramCache]: Analyzing trace with hash 161638, now seen corresponding path program 1 times [2018-01-21 05:57:03,992 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,035 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,035 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,035 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:57:04,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:57:04,087 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 05:57:04,093 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:57:04,099 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:57:04,099 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:57:04,099 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:57:04,099 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:57:04,099 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:57:04,099 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:57:04,099 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:57:04,099 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 05:57:04,100 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:57:04,102 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states. [2018-01-21 05:57:04,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-01-21 05:57:04,104 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:04,104 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:57:04,105 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:57:04,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1534673087, now seen corresponding path program 1 times [2018-01-21 05:57:04,105 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,106 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,106 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:57:04,124 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:57:04,151 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 05:57:04,153 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:57:04,154 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:57:04,154 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:57:04,156 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 05:57:04,173 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 05:57:04,174 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 05:57:04,177 INFO L87 Difference]: Start difference. First operand 63 states. Second operand 2 states. [2018-01-21 05:57:04,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:57:04,276 INFO L93 Difference]: Finished difference Result 119 states and 145 transitions. [2018-01-21 05:57:04,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 05:57:04,278 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-01-21 05:57:04,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:57:04,288 INFO L225 Difference]: With dead ends: 119 [2018-01-21 05:57:04,288 INFO L226 Difference]: Without dead ends: 60 [2018-01-21 05:57:04,291 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 05:57:04,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-01-21 05:57:04,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-01-21 05:57:04,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-01-21 05:57:04,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2018-01-21 05:57:04,324 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 12 [2018-01-21 05:57:04,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:57:04,325 INFO L432 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2018-01-21 05:57:04,325 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 05:57:04,325 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2018-01-21 05:57:04,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-01-21 05:57:04,326 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:04,326 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:57:04,326 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:57:04,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1359962435, now seen corresponding path program 1 times [2018-01-21 05:57:04,326 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,327 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,327 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,327 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,328 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:57:04,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:57:04,367 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 05:57:04,372 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:57:04,374 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:57:04,375 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:57:04,383 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:57:04,384 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:57:04,384 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:57:04,384 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:57:04,384 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:57:04,384 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:57:04,384 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:57:04,384 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 05:57:04,384 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:57:04,386 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states. [2018-01-21 05:57:04,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-01-21 05:57:04,387 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:04,387 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:57:04,388 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 05:57:04,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1736948604, now seen corresponding path program 1 times [2018-01-21 05:57:04,388 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,389 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,389 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,389 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,389 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:57:04,397 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:57:04,407 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 05:57:04,407 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:57:04,407 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:57:04,407 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:57:04,408 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 05:57:04,408 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 05:57:04,408 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 05:57:04,408 INFO L87 Difference]: Start difference. First operand 63 states. Second operand 2 states. [2018-01-21 05:57:04,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:57:04,417 INFO L93 Difference]: Finished difference Result 119 states and 145 transitions. [2018-01-21 05:57:04,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 05:57:04,417 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-01-21 05:57:04,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:57:04,418 INFO L225 Difference]: With dead ends: 119 [2018-01-21 05:57:04,419 INFO L226 Difference]: Without dead ends: 58 [2018-01-21 05:57:04,419 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 05:57:04,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-01-21 05:57:04,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-01-21 05:57:04,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 05:57:04,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2018-01-21 05:57:04,427 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 10 [2018-01-21 05:57:04,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:57:04,427 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2018-01-21 05:57:04,427 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 05:57:04,427 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2018-01-21 05:57:04,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-01-21 05:57:04,428 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:04,428 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:57:04,428 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 05:57:04,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1755007480, now seen corresponding path program 1 times [2018-01-21 05:57:04,429 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,430 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,430 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,430 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,430 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:57:04,441 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:57:04,477 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 05:57:04,477 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:57:04,477 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:57:04,477 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:57:04,477 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 05:57:04,478 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 05:57:04,478 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 05:57:04,478 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand 3 states. [2018-01-21 05:57:04,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:57:04,517 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2018-01-21 05:57:04,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 05:57:04,518 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-01-21 05:57:04,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:57:04,520 INFO L225 Difference]: With dead ends: 80 [2018-01-21 05:57:04,521 INFO L226 Difference]: Without dead ends: 77 [2018-01-21 05:57:04,521 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 05:57:04,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-01-21 05:57:04,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 64. [2018-01-21 05:57:04,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 05:57:04,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 73 transitions. [2018-01-21 05:57:04,528 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 73 transitions. Word has length 14 [2018-01-21 05:57:04,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:57:04,528 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 73 transitions. [2018-01-21 05:57:04,528 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 05:57:04,528 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 73 transitions. [2018-01-21 05:57:04,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 05:57:04,529 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:04,529 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] [2018-01-21 05:57:04,529 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 05:57:04,530 INFO L82 PathProgramCache]: Analyzing trace with hash -108495441, now seen corresponding path program 1 times [2018-01-21 05:57:04,530 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,530 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,531 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,531 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,531 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:57:04,546 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:57:04,577 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 05:57:04,577 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:57:04,577 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 05:57:04,577 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:57:04,578 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 05:57:04,578 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 05:57:04,578 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 05:57:04,578 INFO L87 Difference]: Start difference. First operand 64 states and 73 transitions. Second operand 3 states. [2018-01-21 05:57:04,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:57:04,593 INFO L93 Difference]: Finished difference Result 81 states and 92 transitions. [2018-01-21 05:57:04,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 05:57:04,594 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2018-01-21 05:57:04,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:57:04,595 INFO L225 Difference]: With dead ends: 81 [2018-01-21 05:57:04,595 INFO L226 Difference]: Without dead ends: 62 [2018-01-21 05:57:04,595 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 05:57:04,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-01-21 05:57:04,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-01-21 05:57:04,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-01-21 05:57:04,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2018-01-21 05:57:04,600 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 23 [2018-01-21 05:57:04,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:57:04,600 INFO L432 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2018-01-21 05:57:04,600 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 05:57:04,600 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2018-01-21 05:57:04,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 05:57:04,601 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:57:04,601 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] [2018-01-21 05:57:04,601 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 05:57:04,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1477939535, now seen corresponding path program 1 times [2018-01-21 05:57:04,601 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:57:04,602 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,602 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:57:04,602 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:57:04,602 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:57:04,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:57:04,629 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:57:04,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 05:57:04,692 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:57:04,692 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:57:04,693 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 34 with the following transitions: [2018-01-21 05:57:04,695 INFO L201 CegarAbsIntRunner]: [0], [4], [6], [9], [15], [17], [18], [19], [24], [26], [27], [28], [29], [30], [31], [35], [37], [40], [46], [70], [73], [85], [89], [123], [125], [126], [127], [133], [134], [135] [2018-01-21 05:57:04,738 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 05:57:04,739 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