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/forester-heap/sll-rb-cnstr_1_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:29:54,466 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:29:54,468 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:29:54,482 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:29:54,482 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:29:54,483 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:29:54,483 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:29:54,484 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:29:54,486 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:29:54,486 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:29:54,487 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:29:54,487 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:29:54,488 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:29:54,488 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:29:54,489 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:29:54,491 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:29:54,493 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:29:54,495 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:29:54,496 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:29:54,497 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:29:54,500 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 06:29:54,504 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:29:54,505 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:29:54,505 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 06:29:54,514 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:29:54,515 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:29:54,515 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:29:54,516 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:29:54,516 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:29:54,516 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:29:54,516 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:29:54,516 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:29:54,517 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:29:54,517 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:29:54,517 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:29:54,517 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:29:54,518 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:29:54,518 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:29:54,518 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:29:54,518 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:29:54,518 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:29:54,519 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:29:54,519 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:29:54,519 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:29:54,519 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:29:54,519 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:29:54,520 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:29:54,520 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:29:54,520 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:29:54,520 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:29:54,520 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:29:54,521 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:29:54,521 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:29:54,521 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:29:54,521 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:29:54,521 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:29:54,521 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:29:54,522 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:29:54,522 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:29:54,522 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:29:54,522 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:29:54,523 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:29:54,523 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:29:54,557 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:29:54,568 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:29:54,572 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:29:54,574 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:29:54,574 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:29:54,575 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/sll-rb-cnstr_1_true-unreach-call_true-valid-memsafety.i [2018-01-21 06:29:54,729 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:29:54,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:29:54,735 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:29:54,735 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:29:54,739 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:29:54,740 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,742 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27608974 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54, skipping insertion in model container [2018-01-21 06:29:54,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,755 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:29:54,796 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:29:54,919 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:29:54,945 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:29:54,954 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54 WrapperNode [2018-01-21 06:29:54,954 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:29:54,955 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:29:54,955 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:29:54,955 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:29:54,969 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,970 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,979 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,980 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,987 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,992 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,994 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (1/1) ... [2018-01-21 06:29:54,997 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:29:54,997 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:29:54,998 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:29:54,998 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:29:54,999 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (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 06:29:55,065 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:29:55,065 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:29:55,065 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:29:55,066 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:29:55,067 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 06:29:55,067 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 06:29:55,067 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 06:29:55,067 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 06:29:55,067 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:29:55,067 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:29:55,068 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:29:55,392 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:29:55,393 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:29:55 BoogieIcfgContainer [2018-01-21 06:29:55,393 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:29:55,395 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:29:55,395 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:29:55,397 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:29:55,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:29:54" (1/3) ... [2018-01-21 06:29:55,399 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4efb48b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:29:55, skipping insertion in model container [2018-01-21 06:29:55,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:29:54" (2/3) ... [2018-01-21 06:29:55,399 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4efb48b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:29:55, skipping insertion in model container [2018-01-21 06:29:55,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:29:55" (3/3) ... [2018-01-21 06:29:55,401 INFO L105 eAbstractionObserver]: Analyzing ICFG sll-rb-cnstr_1_true-unreach-call_true-valid-memsafety.i [2018-01-21 06:29:55,408 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:29:55,415 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 06:29:55,452 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:29:55,452 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:29:55,452 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:29:55,452 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:29:55,453 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:29:55,453 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:29:55,453 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:29:55,453 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:29:55,453 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:29:55,470 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states. [2018-01-21 06:29:55,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:29:55,477 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:55,478 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:29:55,478 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:29:55,481 INFO L82 PathProgramCache]: Analyzing trace with hash 202351, now seen corresponding path program 1 times [2018-01-21 06:29:55,483 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:55,529 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:55,529 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:55,529 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:55,530 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:55,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:29:55,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:29:55,580 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:29:55,587 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:29:55,594 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:29:55,594 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:29:55,594 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:29:55,594 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:29:55,594 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:29:55,595 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:29:55,595 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:29:55,595 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:29:55,595 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:29:55,598 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states. [2018-01-21 06:29:55,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 06:29:55,600 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:55,600 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] [2018-01-21 06:29:55,600 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:29:55,600 INFO L82 PathProgramCache]: Analyzing trace with hash -579641887, now seen corresponding path program 1 times [2018-01-21 06:29:55,601 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:55,603 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:55,603 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:55,603 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:55,603 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:55,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:29:55,633 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:29:55,757 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 06:29:55,758 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:29:55,759 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:29:55,759 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:29:55,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:29:55,773 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:29:55,774 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:29:55,776 INFO L87 Difference]: Start difference. First operand 73 states. Second operand 2 states. [2018-01-21 06:29:55,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:29:55,798 INFO L93 Difference]: Finished difference Result 117 states and 154 transitions. [2018-01-21 06:29:55,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:29:55,800 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-21 06:29:55,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:29:55,811 INFO L225 Difference]: With dead ends: 117 [2018-01-21 06:29:55,811 INFO L226 Difference]: Without dead ends: 70 [2018-01-21 06:29:55,814 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 06:29:55,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-01-21 06:29:55,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-01-21 06:29:55,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-01-21 06:29:55,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 75 transitions. [2018-01-21 06:29:55,848 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 75 transitions. Word has length 20 [2018-01-21 06:29:55,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:29:55,849 INFO L432 AbstractCegarLoop]: Abstraction has 70 states and 75 transitions. [2018-01-21 06:29:55,849 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:29:55,849 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 75 transitions. [2018-01-21 06:29:55,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 06:29:55,850 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:55,851 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] [2018-01-21 06:29:55,851 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:29:55,851 INFO L82 PathProgramCache]: Analyzing trace with hash -675072438, now seen corresponding path program 1 times [2018-01-21 06:29:55,851 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:55,853 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:55,853 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:55,853 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:55,854 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:55,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:29:55,877 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:29:55,990 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 06:29:55,990 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:29:55,990 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:29:55,990 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:29:55,992 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:29:55,993 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:29:55,993 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:29:55,993 INFO L87 Difference]: Start difference. First operand 70 states and 75 transitions. Second operand 5 states. [2018-01-21 06:29:56,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:29:56,161 INFO L93 Difference]: Finished difference Result 118 states and 129 transitions. [2018-01-21 06:29:56,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:29:56,161 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 29 [2018-01-21 06:29:56,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:29:56,164 INFO L225 Difference]: With dead ends: 118 [2018-01-21 06:29:56,164 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 06:29:56,165 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:29:56,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 06:29:56,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 74. [2018-01-21 06:29:56,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-01-21 06:29:56,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 79 transitions. [2018-01-21 06:29:56,175 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 79 transitions. Word has length 29 [2018-01-21 06:29:56,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:29:56,175 INFO L432 AbstractCegarLoop]: Abstraction has 74 states and 79 transitions. [2018-01-21 06:29:56,175 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:29:56,176 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 79 transitions. [2018-01-21 06:29:56,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-21 06:29:56,177 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:56,177 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] [2018-01-21 06:29:56,178 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:29:56,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1367476593, now seen corresponding path program 1 times [2018-01-21 06:29:56,178 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:56,179 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,179 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:56,179 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,180 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:56,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:29:56,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:29:56,245 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:29:56,254 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:29:56,259 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:29:56,260 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:29:56,275 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:29:56,275 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:29:56,275 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:29:56,275 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:29:56,276 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:29:56,276 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:29:56,276 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:29:56,276 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 06:29:56,276 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:29:56,278 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states. [2018-01-21 06:29:56,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 06:29:56,279 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:56,279 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:29:56,279 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 06:29:56,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1698925306, now seen corresponding path program 1 times [2018-01-21 06:29:56,280 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:56,281 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,281 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:56,282 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,282 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:56,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:29:56,293 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:29:56,308 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 06:29:56,309 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:29:56,309 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:29:56,309 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:29:56,309 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:29:56,309 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:29:56,310 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:29:56,310 INFO L87 Difference]: Start difference. First operand 73 states. Second operand 2 states. [2018-01-21 06:29:56,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:29:56,317 INFO L93 Difference]: Finished difference Result 117 states and 154 transitions. [2018-01-21 06:29:56,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:29:56,317 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2018-01-21 06:29:56,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:29:56,318 INFO L225 Difference]: With dead ends: 117 [2018-01-21 06:29:56,318 INFO L226 Difference]: Without dead ends: 68 [2018-01-21 06:29:56,319 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 06:29:56,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-01-21 06:29:56,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-01-21 06:29:56,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-01-21 06:29:56,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 73 transitions. [2018-01-21 06:29:56,325 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 73 transitions. Word has length 18 [2018-01-21 06:29:56,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:29:56,325 INFO L432 AbstractCegarLoop]: Abstraction has 68 states and 73 transitions. [2018-01-21 06:29:56,326 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:29:56,326 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 73 transitions. [2018-01-21 06:29:56,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 06:29:56,327 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:56,327 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 06:29:56,327 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 06:29:56,327 INFO L82 PathProgramCache]: Analyzing trace with hash -456567889, now seen corresponding path program 1 times [2018-01-21 06:29:56,328 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:56,329 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,329 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:56,329 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,330 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:56,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:29:56,343 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:29:56,407 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 06:29:56,407 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:29:56,407 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:29:56,407 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:29:56,408 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:29:56,408 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:29:56,408 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:29:56,409 INFO L87 Difference]: Start difference. First operand 68 states and 73 transitions. Second operand 5 states. [2018-01-21 06:29:56,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:29:56,574 INFO L93 Difference]: Finished difference Result 114 states and 125 transitions. [2018-01-21 06:29:56,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:29:56,574 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2018-01-21 06:29:56,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:29:56,576 INFO L225 Difference]: With dead ends: 114 [2018-01-21 06:29:56,576 INFO L226 Difference]: Without dead ends: 97 [2018-01-21 06:29:56,576 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:29:56,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-01-21 06:29:56,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2018-01-21 06:29:56,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 06:29:56,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-21 06:29:56,584 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 27 [2018-01-21 06:29:56,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:29:56,584 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-21 06:29:56,584 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:29:56,585 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-21 06:29:56,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 06:29:56,586 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:29:56,586 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] [2018-01-21 06:29:56,586 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 06:29:56,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1118740172, now seen corresponding path program 1 times [2018-01-21 06:29:56,587 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:29:56,588 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,588 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:29:56,589 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:29:56,589 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:29:56,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:29:56,606 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:29:56,743 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 06:29:56,743 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:29:56,744 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:29:56,745 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 42 with the following transitions: [2018-01-21 06:29:56,746 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [8], [10], [13], [39], [43], [48], [52], [60], [61], [66], [70], [78], [82], [84], [85], [128], [130], [131], [137], [141], [143], [144], [155], [156], [157], [158], [159], [164], [166], [167], [168], [174], [175], [176] [2018-01-21 06:29:56,793 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:29:56,793 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