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_smtcomp.epf -i ../../../trunk/examples/svcomp/forester-heap/sll-token_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:58:34,373 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:58:34,375 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:58:34,390 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:58:34,390 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:58:34,391 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:58:34,392 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:58:34,394 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:58:34,396 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:58:34,396 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:58:34,397 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:58:34,398 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:58:34,398 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:58:34,400 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:58:34,401 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:58:34,403 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:58:34,405 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:58:34,407 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:58:34,408 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:58:34,409 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:58:34,412 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 10:58:34,416 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:58:34,417 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:58:34,417 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_smtcomp.epf [2018-01-21 10:58:34,427 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:58:34,427 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:58:34,428 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:58:34,428 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:58:34,428 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:58:34,428 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:58:34,429 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:58:34,429 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:58:34,429 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:58:34,430 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:58:34,430 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:58:34,430 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:58:34,430 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:58:34,430 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:58:34,431 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:58:34,431 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:58:34,431 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:58:34,431 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:58:34,431 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:58:34,432 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:58:34,432 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:58:34,432 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:58:34,432 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:58:34,432 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:58:34,433 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:58:34,433 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:58:34,433 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:58:34,433 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:58:34,433 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:58:34,434 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:58:34,434 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:58:34,434 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:58:34,434 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:58:34,434 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:58:34,435 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:58:34,435 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:58:34,435 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:58:34,436 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:58:34,436 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:58:34,470 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:58:34,483 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:58:34,487 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:58:34,488 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:58:34,489 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:58:34,490 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/sll-token_true-unreach-call_true-valid-memsafety.i [2018-01-21 10:58:34,665 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:58:34,668 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:58:34,669 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:58:34,669 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:58:34,674 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:58:34,674 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,677 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@585c73c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34, skipping insertion in model container [2018-01-21 10:58:34,677 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,695 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:58:34,737 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:58:34,856 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:58:34,876 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:58:34,885 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34 WrapperNode [2018-01-21 10:58:34,885 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:58:34,886 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:58:34,886 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:58:34,886 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:58:34,903 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,903 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,920 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,925 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,927 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (1/1) ... [2018-01-21 10:58:34,929 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:58:34,930 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:58:34,930 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:58:34,930 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:58:34,931 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (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 10:58:34,996 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:58:34,996 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:58:34,997 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:58:34,997 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:58:34,997 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:58:34,997 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 10:58:34,997 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 10:58:34,997 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:58:34,998 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:58:34,998 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:58:34,998 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 10:58:34,998 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 10:58:34,998 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 10:58:34,998 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 10:58:34,999 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:58:34,999 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:58:34,999 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:58:35,291 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:58:35,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:58:35 BoogieIcfgContainer [2018-01-21 10:58:35,292 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:58:35,293 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:58:35,293 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:58:35,296 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:58:35,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:58:34" (1/3) ... [2018-01-21 10:58:35,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19c06ed6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:58:35, skipping insertion in model container [2018-01-21 10:58:35,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:58:34" (2/3) ... [2018-01-21 10:58:35,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19c06ed6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:58:35, skipping insertion in model container [2018-01-21 10:58:35,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:58:35" (3/3) ... [2018-01-21 10:58:35,300 INFO L105 eAbstractionObserver]: Analyzing ICFG sll-token_true-unreach-call_true-valid-memsafety.i [2018-01-21 10:58:35,309 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:58:35,317 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 10:58:35,359 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:58:35,359 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:58:35,359 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:58:35,359 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:58:35,359 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:58:35,360 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:58:35,360 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:58:35,360 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:58:35,361 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:58:35,383 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states. [2018-01-21 10:58:35,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:58:35,390 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:35,391 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:58:35,391 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:58:35,395 INFO L82 PathProgramCache]: Analyzing trace with hash 217246, now seen corresponding path program 1 times [2018-01-21 10:58:35,397 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:35,437 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,438 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:35,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:35,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:58:35,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:58:35,502 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:58:35,507 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:58:35,513 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:58:35,513 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:58:35,513 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:58:35,513 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:58:35,513 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:58:35,514 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:58:35,514 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:58:35,514 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:58:35,514 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:58:35,516 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states. [2018-01-21 10:58:35,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 10:58:35,518 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:35,518 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 10:58:35,518 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:58:35,518 INFO L82 PathProgramCache]: Analyzing trace with hash -877601121, now seen corresponding path program 1 times [2018-01-21 10:58:35,518 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:35,520 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,520 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:35,520 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,520 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:35,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:58:35,553 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:58:35,602 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 10:58:35,604 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:58:35,604 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:58:35,604 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:58:35,607 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:58:35,689 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:58:35,690 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:58:35,692 INFO L87 Difference]: Start difference. First operand 72 states. Second operand 2 states. [2018-01-21 10:58:35,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:58:35,713 INFO L93 Difference]: Finished difference Result 133 states and 179 transitions. [2018-01-21 10:58:35,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:58:35,714 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 34 [2018-01-21 10:58:35,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:58:35,726 INFO L225 Difference]: With dead ends: 133 [2018-01-21 10:58:35,727 INFO L226 Difference]: Without dead ends: 69 [2018-01-21 10:58:35,730 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 10:58:35,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-01-21 10:58:35,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-01-21 10:58:35,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-01-21 10:58:35,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2018-01-21 10:58:35,766 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 34 [2018-01-21 10:58:35,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:58:35,767 INFO L432 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2018-01-21 10:58:35,767 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:58:35,767 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2018-01-21 10:58:35,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-21 10:58:35,769 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:35,769 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:58:35,769 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:58:35,769 INFO L82 PathProgramCache]: Analyzing trace with hash 555175312, now seen corresponding path program 1 times [2018-01-21 10:58:35,769 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:35,770 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,770 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:35,770 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,771 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:35,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:58:35,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:58:35,889 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:58:35,901 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:58:35,911 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:58:35,912 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:58:35,929 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:58:35,929 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:58:35,929 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:58:35,929 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:58:35,929 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:58:35,929 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:58:35,930 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:58:35,930 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 10:58:35,930 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:58:35,932 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states. [2018-01-21 10:58:35,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 10:58:35,934 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:35,934 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:58:35,934 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 10:58:35,935 INFO L82 PathProgramCache]: Analyzing trace with hash -2056776860, now seen corresponding path program 1 times [2018-01-21 10:58:35,935 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:35,936 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,936 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:35,936 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,936 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:35,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:58:35,950 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:58:35,970 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 10:58:35,970 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:58:35,970 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:58:35,971 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:58:35,971 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:58:35,971 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:58:35,971 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:58:35,972 INFO L87 Difference]: Start difference. First operand 72 states. Second operand 2 states. [2018-01-21 10:58:35,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:58:35,981 INFO L93 Difference]: Finished difference Result 133 states and 179 transitions. [2018-01-21 10:58:35,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:58:35,981 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 32 [2018-01-21 10:58:35,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:58:35,983 INFO L225 Difference]: With dead ends: 133 [2018-01-21 10:58:35,983 INFO L226 Difference]: Without dead ends: 67 [2018-01-21 10:58:35,984 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 10:58:35,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-01-21 10:58:35,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-01-21 10:58:35,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 10:58:35,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2018-01-21 10:58:35,991 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 32 [2018-01-21 10:58:35,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:58:35,992 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2018-01-21 10:58:35,992 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:58:35,992 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2018-01-21 10:58:35,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 10:58:35,994 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:35,994 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:58:35,994 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 10:58:35,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1764783467, now seen corresponding path program 1 times [2018-01-21 10:58:35,994 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:35,995 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,995 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:35,996 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:35,996 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:36,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:58:36,027 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:58:36,793 WARN L146 SmtUtils]: Spent 139ms on a formula simplification. DAG size of input: 31 DAG size of output 22 [2018-01-21 10:58:37,146 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 10:58:37,147 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:58:37,147 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2018-01-21 10:58:37,147 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:58:37,148 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 10:58:37,148 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 10:58:37,148 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2018-01-21 10:58:37,148 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand 14 states. [2018-01-21 10:58:37,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:58:37,784 INFO L93 Difference]: Finished difference Result 141 states and 147 transitions. [2018-01-21 10:58:37,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 10:58:37,784 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 49 [2018-01-21 10:58:37,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:58:37,786 INFO L225 Difference]: With dead ends: 141 [2018-01-21 10:58:37,787 INFO L226 Difference]: Without dead ends: 130 [2018-01-21 10:58:37,788 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:58:37,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-01-21 10:58:37,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 102. [2018-01-21 10:58:37,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-01-21 10:58:37,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2018-01-21 10:58:37,801 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 49 [2018-01-21 10:58:37,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:58:37,802 INFO L432 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2018-01-21 10:58:37,802 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 10:58:37,802 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2018-01-21 10:58:37,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-01-21 10:58:37,804 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:37,804 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, 1, 1, 1, 1, 1] [2018-01-21 10:58:37,805 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 10:58:37,805 INFO L82 PathProgramCache]: Analyzing trace with hash 493838129, now seen corresponding path program 1 times [2018-01-21 10:58:37,805 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:37,806 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:37,806 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:37,806 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:37,807 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:37,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:58:37,832 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:58:38,098 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:58:38,098 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:58:38,098 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2018-01-21 10:58:38,099 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:58:38,099 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 10:58:38,099 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 10:58:38,099 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2018-01-21 10:58:38,100 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand 13 states. [2018-01-21 10:58:38,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:58:38,437 INFO L93 Difference]: Finished difference Result 165 states and 172 transitions. [2018-01-21 10:58:38,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:58:38,438 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2018-01-21 10:58:38,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:58:38,439 INFO L225 Difference]: With dead ends: 165 [2018-01-21 10:58:38,439 INFO L226 Difference]: Without dead ends: 101 [2018-01-21 10:58:38,439 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=156, Invalid=350, Unknown=0, NotChecked=0, Total=506 [2018-01-21 10:58:38,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-01-21 10:58:38,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 70. [2018-01-21 10:58:38,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-01-21 10:58:38,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2018-01-21 10:58:38,444 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 55 [2018-01-21 10:58:38,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:58:38,444 INFO L432 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2018-01-21 10:58:38,444 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 10:58:38,444 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2018-01-21 10:58:38,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-01-21 10:58:38,446 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:58:38,446 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:58:38,446 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 10:58:38,446 INFO L82 PathProgramCache]: Analyzing trace with hash 22904710, now seen corresponding path program 1 times [2018-01-21 10:58:38,446 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:58:38,447 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:38,447 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:58:38,448 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:58:38,448 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:58:38,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:58:38,476 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:58:39,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:58:39,282 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:58:39,282 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:58:39,283 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 61 with the following transitions: [2018-01-21 10:58:39,284 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [8], [10], [13], [15], [16], [17], [18], [19], [20], [24], [29], [33], [42], [43], [44], [45], [46], [47], [51], [56], [60], [68], [70], [73], [102], [103], [108], [112], [118], [119], [123], [124], [129], [133], [139], [143], [145], [148], [159], [160], [165], [169], [175], [176], [177], [178], [179], [181], [182], [183], [189], [190], [191] [2018-01-21 10:58:39,337 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:58:39,337 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