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_mostprecise.epf -i ../../../trunk/examples/svcomp/forester-heap/dll-rb-sentinel_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:41:20,468 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:41:20,578 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:41:20,598 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:41:20,599 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:41:20,599 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:41:20,600 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:41:20,602 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:41:20,603 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:41:20,604 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:41:20,605 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:41:20,605 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:41:20,606 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:41:20,607 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:41:20,608 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:41:20,618 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:41:20,620 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:41:20,623 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:41:20,624 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:41:20,626 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:41:20,628 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 03:41:20,636 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 03:41:20,637 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 03:41:20,637 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_mostprecise.epf [2018-01-21 03:41:20,648 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:41:20,648 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:41:20,649 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:41:20,649 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:41:20,649 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:41:20,650 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:41:20,650 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:41:20,650 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:41:20,650 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:41:20,651 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:41:20,651 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:41:20,652 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:41:20,652 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:41:20,652 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:41:20,652 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:41:20,652 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:41:20,653 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:41:20,653 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:41:20,653 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:41:20,653 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:41:20,653 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:41:20,654 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:41:20,654 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:41:20,654 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:41:20,654 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:41:20,654 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:41:20,655 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:41:20,655 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:41:20,655 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:41:20,655 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:41:20,655 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:41:20,656 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:41:20,656 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:41:20,656 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:41:20,656 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:41:20,656 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:41:20,657 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:41:20,657 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:41:20,658 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:41:20,660 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:41:20,709 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:41:20,720 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:41:20,724 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:41:20,725 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:41:20,726 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:41:20,726 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-rb-sentinel_true-unreach-call_true-valid-memsafety.i [2018-01-21 03:41:20,920 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:41:20,925 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:41:20,926 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:41:20,926 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:41:20,931 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:41:20,932 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:41:20" (1/1) ... [2018-01-21 03:41:20,935 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27f8129e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:20, skipping insertion in model container [2018-01-21 03:41:20,935 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:41:20" (1/1) ... [2018-01-21 03:41:20,951 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:41:21,004 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:41:21,166 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:41:21,188 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:41:21,198 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21 WrapperNode [2018-01-21 03:41:21,198 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:41:21,199 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:41:21,199 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:41:21,199 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:41:21,215 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,215 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,228 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,242 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,244 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (1/1) ... [2018-01-21 03:41:21,248 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:41:21,248 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:41:21,248 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:41:21,249 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:41:21,250 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (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 03:41:21,311 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:41:21,311 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:41:21,311 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:41:21,311 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 03:41:21,311 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 03:41:21,312 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 03:41:21,313 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 03:41:21,313 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 03:41:21,313 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:41:21,313 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:41:21,313 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:41:21,726 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:41:21,727 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:41:21 BoogieIcfgContainer [2018-01-21 03:41:21,727 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:41:21,728 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:41:21,729 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:41:21,731 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:41:21,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:41:20" (1/3) ... [2018-01-21 03:41:21,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@337ea40c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:41:21, skipping insertion in model container [2018-01-21 03:41:21,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:41:21" (2/3) ... [2018-01-21 03:41:21,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@337ea40c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:41:21, skipping insertion in model container [2018-01-21 03:41:21,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:41:21" (3/3) ... [2018-01-21 03:41:21,735 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-rb-sentinel_true-unreach-call_true-valid-memsafety.i [2018-01-21 03:41:21,745 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:41:21,753 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 03:41:21,807 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:41:21,807 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:41:21,808 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:41:21,808 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:41:21,808 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:41:21,808 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:41:21,808 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:41:21,808 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:41:21,809 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:41:21,827 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2018-01-21 03:41:21,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:41:21,833 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:21,834 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:41:21,834 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:41:21,838 INFO L82 PathProgramCache]: Analyzing trace with hash 267889, now seen corresponding path program 1 times [2018-01-21 03:41:21,840 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:21,893 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:21,893 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:21,893 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:21,894 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:21,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:41:21,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:41:21,946 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:41:21,953 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:41:21,963 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:41:21,963 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:41:21,963 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:41:21,963 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:41:21,964 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:41:21,964 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:41:21,964 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:41:21,964 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:41:21,964 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:41:21,971 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2018-01-21 03:41:21,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 03:41:21,974 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:21,976 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] [2018-01-21 03:41:21,976 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:41:21,976 INFO L82 PathProgramCache]: Analyzing trace with hash 2122179741, now seen corresponding path program 1 times [2018-01-21 03:41:21,977 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:21,978 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:21,979 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:21,979 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:21,980 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:22,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:22,041 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:22,213 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 03:41:22,215 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:41:22,215 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:41:22,215 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:41:22,218 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:41:22,229 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:41:22,229 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:41:22,231 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 2 states. [2018-01-21 03:41:22,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:41:22,255 INFO L93 Difference]: Finished difference Result 177 states and 235 transitions. [2018-01-21 03:41:22,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:41:22,257 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 27 [2018-01-21 03:41:22,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:41:22,270 INFO L225 Difference]: With dead ends: 177 [2018-01-21 03:41:22,271 INFO L226 Difference]: Without dead ends: 94 [2018-01-21 03:41:22,274 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 03:41:22,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-01-21 03:41:22,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-01-21 03:41:22,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-01-21 03:41:22,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2018-01-21 03:41:22,316 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 27 [2018-01-21 03:41:22,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:41:22,317 INFO L432 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2018-01-21 03:41:22,317 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:41:22,317 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2018-01-21 03:41:22,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 03:41:22,319 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:22,319 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, 1, 1, 1, 1] [2018-01-21 03:41:22,319 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:41:22,320 INFO L82 PathProgramCache]: Analyzing trace with hash 798686160, now seen corresponding path program 1 times [2018-01-21 03:41:22,320 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:22,322 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:22,322 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:22,322 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:22,322 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:22,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:22,363 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:22,496 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 03:41:22,497 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:41:22,497 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 03:41:22,497 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:41:22,499 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:41:22,499 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:41:22,499 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 03:41:22,500 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand 8 states. [2018-01-21 03:41:22,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:41:22,905 INFO L93 Difference]: Finished difference Result 155 states and 168 transitions. [2018-01-21 03:41:22,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:41:22,905 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 03:41:22,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:41:22,910 INFO L225 Difference]: With dead ends: 155 [2018-01-21 03:41:22,910 INFO L226 Difference]: Without dead ends: 135 [2018-01-21 03:41:22,911 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2018-01-21 03:41:22,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-01-21 03:41:22,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 96. [2018-01-21 03:41:22,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 03:41:22,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2018-01-21 03:41:22,923 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 36 [2018-01-21 03:41:22,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:41:22,924 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2018-01-21 03:41:22,924 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:41:22,924 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2018-01-21 03:41:22,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 03:41:22,926 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:22,926 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, 1, 1, 1, 1, 1] [2018-01-21 03:41:22,926 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:41:22,927 INFO L82 PathProgramCache]: Analyzing trace with hash -611659746, now seen corresponding path program 1 times [2018-01-21 03:41:22,927 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:22,928 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:22,929 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:22,929 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:22,929 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:22,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:22,956 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:23,135 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:41:23,136 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:41:23,136 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 03:41:23,136 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:41:23,137 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:41:23,137 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:41:23,137 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 03:41:23,137 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand 8 states. [2018-01-21 03:41:23,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:41:23,480 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2018-01-21 03:41:23,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:41:23,481 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2018-01-21 03:41:23,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:41:23,482 INFO L225 Difference]: With dead ends: 132 [2018-01-21 03:41:23,482 INFO L226 Difference]: Without dead ends: 126 [2018-01-21 03:41:23,483 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2018-01-21 03:41:23,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-21 03:41:23,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-21 03:41:23,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-21 03:41:23,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 103 transitions. [2018-01-21 03:41:23,496 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 103 transitions. Word has length 42 [2018-01-21 03:41:23,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:41:23,497 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 103 transitions. [2018-01-21 03:41:23,497 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:41:23,497 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 103 transitions. [2018-01-21 03:41:23,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 03:41:23,498 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:23,498 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:41:23,498 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:41:23,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1884398603, now seen corresponding path program 1 times [2018-01-21 03:41:23,499 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:23,500 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,500 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:23,500 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,500 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:23,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:41:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:41:23,585 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:41:23,596 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:41:23,607 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:41:23,608 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:41:23,628 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:41:23,629 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:41:23,629 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:41:23,629 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:41:23,629 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:41:23,629 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:41:23,629 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:41:23,629 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 03:41:23,630 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:41:23,632 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2018-01-21 03:41:23,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 03:41:23,633 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:23,633 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] [2018-01-21 03:41:23,634 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 03:41:23,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1342988930, now seen corresponding path program 1 times [2018-01-21 03:41:23,634 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:23,635 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,636 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:23,636 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,636 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:23,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:23,648 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:23,663 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 03:41:23,664 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:41:23,664 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:41:23,664 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:41:23,664 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:41:23,665 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:41:23,665 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:41:23,665 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 2 states. [2018-01-21 03:41:23,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:41:23,670 INFO L93 Difference]: Finished difference Result 177 states and 235 transitions. [2018-01-21 03:41:23,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:41:23,671 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 25 [2018-01-21 03:41:23,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:41:23,672 INFO L225 Difference]: With dead ends: 177 [2018-01-21 03:41:23,672 INFO L226 Difference]: Without dead ends: 92 [2018-01-21 03:41:23,673 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 03:41:23,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-01-21 03:41:23,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2018-01-21 03:41:23,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-01-21 03:41:23,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 97 transitions. [2018-01-21 03:41:23,680 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 97 transitions. Word has length 25 [2018-01-21 03:41:23,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:41:23,680 INFO L432 AbstractCegarLoop]: Abstraction has 92 states and 97 transitions. [2018-01-21 03:41:23,680 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:41:23,680 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 97 transitions. [2018-01-21 03:41:23,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 03:41:23,681 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:23,681 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, 1, 1] [2018-01-21 03:41:23,681 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 03:41:23,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1210340747, now seen corresponding path program 1 times [2018-01-21 03:41:23,681 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:23,682 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,683 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:23,683 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,683 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:23,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:23,705 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:23,777 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 03:41:23,777 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:41:23,777 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 03:41:23,777 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:41:23,778 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:41:23,778 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:41:23,778 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 03:41:23,778 INFO L87 Difference]: Start difference. First operand 92 states and 97 transitions. Second operand 8 states. [2018-01-21 03:41:23,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:41:23,971 INFO L93 Difference]: Finished difference Result 151 states and 163 transitions. [2018-01-21 03:41:23,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:41:23,971 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2018-01-21 03:41:23,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:41:23,973 INFO L225 Difference]: With dead ends: 151 [2018-01-21 03:41:23,973 INFO L226 Difference]: Without dead ends: 133 [2018-01-21 03:41:23,974 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2018-01-21 03:41:23,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-01-21 03:41:23,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 94. [2018-01-21 03:41:23,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-01-21 03:41:23,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2018-01-21 03:41:23,981 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 34 [2018-01-21 03:41:23,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:41:23,981 INFO L432 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2018-01-21 03:41:23,982 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:41:23,982 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2018-01-21 03:41:23,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 03:41:23,985 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:23,985 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, 1, 1, 1] [2018-01-21 03:41:23,985 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 03:41:23,986 INFO L82 PathProgramCache]: Analyzing trace with hash -961529277, now seen corresponding path program 1 times [2018-01-21 03:41:23,986 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:23,987 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,987 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:23,987 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:23,987 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:24,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:24,004 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:24,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:41:24,146 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:41:24,146 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-01-21 03:41:24,146 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:41:24,147 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:41:24,147 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:41:24,147 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-21 03:41:24,147 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand 8 states. [2018-01-21 03:41:24,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:41:24,362 INFO L93 Difference]: Finished difference Result 128 states and 136 transitions. [2018-01-21 03:41:24,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:41:24,362 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2018-01-21 03:41:24,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:41:24,364 INFO L225 Difference]: With dead ends: 128 [2018-01-21 03:41:24,364 INFO L226 Difference]: Without dead ends: 124 [2018-01-21 03:41:24,364 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=118, Unknown=0, NotChecked=0, Total=182 [2018-01-21 03:41:24,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-01-21 03:41:24,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 96. [2018-01-21 03:41:24,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 03:41:24,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2018-01-21 03:41:24,373 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 40 [2018-01-21 03:41:24,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:41:24,374 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2018-01-21 03:41:24,374 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:41:24,374 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2018-01-21 03:41:24,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 03:41:24,375 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:41:24,375 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:41:24,376 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 03:41:24,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1660607120, now seen corresponding path program 1 times [2018-01-21 03:41:24,376 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:41:24,377 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:24,377 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:41:24,378 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:41:24,378 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:41:24,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:41:24,395 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:41:24,783 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 03:41:24,783 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:41:24,783 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:41:24,784 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 49 with the following transitions: [2018-01-21 03:41:24,786 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [14], [16], [19], [104], [108], [113], [117], [125], [126], [131], [135], [143], [147], [149], [150], [193], [195], [196], [202], [206], [208], [209], [220], [221], [222], [223], [224], [229], [230], [232], [233], [234], [240], [241], [242] [2018-01-21 03:41:24,840 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:41:24,841 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