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/dll-rb-cnstr_1_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:24:04,359 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:24:04,360 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:24:04,376 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:24:04,376 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:24:04,377 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:24:04,378 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:24:04,380 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:24:04,382 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:24:04,383 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:24:04,384 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:24:04,384 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:24:04,385 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:24:04,387 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:24:04,388 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:24:04,390 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:24:04,393 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:24:04,395 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:24:04,397 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:24:04,398 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:24:04,401 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:24:04,401 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:24:04,401 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:24:04,402 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:24:04,403 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:24:04,405 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:24:04,405 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:24:04,406 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:24:04,406 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:24:04,406 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:24:04,407 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:24:04,407 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 06:24:04,415 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:24:04,416 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:24:04,417 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:24:04,417 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:24:04,417 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:24:04,417 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:24:04,417 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:24:04,417 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:24:04,418 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:24:04,418 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:24:04,418 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:24:04,418 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:24:04,418 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:24:04,418 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:24:04,418 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:24:04,419 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:24:04,419 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:24:04,420 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:24:04,420 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:24:04,420 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:24:04,420 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:24:04,420 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:24:04,421 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:24:04,422 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:24:04,422 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:24:04,456 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:24:04,467 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:24:04,470 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:24:04,471 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:24:04,472 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:24:04,472 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-rb-cnstr_1_true-unreach-call_true-valid-memsafety.i [2018-01-21 06:24:04,660 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:24:04,663 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:24:04,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:24:04,664 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:24:04,669 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:24:04,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,672 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39c1589c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04, skipping insertion in model container [2018-01-21 06:24:04,672 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,685 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:24:04,726 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:24:04,852 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:24:04,871 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:24:04,881 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04 WrapperNode [2018-01-21 06:24:04,881 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:24:04,881 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:24:04,882 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:24:04,882 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:24:04,893 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,893 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,903 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,903 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,909 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,913 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,915 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (1/1) ... [2018-01-21 06:24:04,918 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:24:04,919 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:24:04,919 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:24:04,919 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:24:04,920 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (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 06:24:04,969 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:24:04,969 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:24:04,969 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:24:04,970 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 06:24:04,971 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 06:24:04,971 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 06:24:04,971 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 06:24:04,971 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:24:04,971 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:24:04,971 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:24:05,360 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:24:05,361 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:24:05 BoogieIcfgContainer [2018-01-21 06:24:05,361 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:24:05,362 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:24:05,362 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:24:05,364 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:24:05,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:24:04" (1/3) ... [2018-01-21 06:24:05,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1787cc41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:24:05, skipping insertion in model container [2018-01-21 06:24:05,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:24:04" (2/3) ... [2018-01-21 06:24:05,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1787cc41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:24:05, skipping insertion in model container [2018-01-21 06:24:05,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:24:05" (3/3) ... [2018-01-21 06:24:05,368 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-rb-cnstr_1_true-unreach-call_true-valid-memsafety.i [2018-01-21 06:24:05,374 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:24:05,381 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 06:24:05,422 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:24:05,422 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:24:05,422 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:24:05,422 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:24:05,422 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:24:05,423 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:24:05,423 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:24:05,423 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:24:05,423 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:24:05,441 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states. [2018-01-21 06:24:05,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:24:05,447 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:05,448 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:24:05,448 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:24:05,452 INFO L82 PathProgramCache]: Analyzing trace with hash 261931, now seen corresponding path program 1 times [2018-01-21 06:24:05,454 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:05,504 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:05,504 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:05,504 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:05,504 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:05,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:24:05,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:24:05,558 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:24:05,565 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:24:05,572 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:24:05,573 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:24:05,573 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:24:05,573 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:24:05,573 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:24:05,573 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:24:05,573 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:24:05,574 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:24:05,574 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:24:05,577 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states. [2018-01-21 06:24:05,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 06:24:05,579 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:05,580 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] [2018-01-21 06:24:05,580 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:24:05,580 INFO L82 PathProgramCache]: Analyzing trace with hash 1481030300, now seen corresponding path program 1 times [2018-01-21 06:24:05,580 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:05,582 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:05,582 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:05,582 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:05,582 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:05,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:24:05,617 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:24:05,752 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 06:24:05,754 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:24:05,754 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:24:05,754 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:24:05,757 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:24:05,768 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:24:05,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:24:05,770 INFO L87 Difference]: Start difference. First operand 91 states. Second operand 2 states. [2018-01-21 06:24:05,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:24:05,797 INFO L93 Difference]: Finished difference Result 170 states and 228 transitions. [2018-01-21 06:24:05,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:24:05,799 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2018-01-21 06:24:05,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:24:05,810 INFO L225 Difference]: With dead ends: 170 [2018-01-21 06:24:05,810 INFO L226 Difference]: Without dead ends: 88 [2018-01-21 06:24:05,813 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 06:24:05,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-01-21 06:24:05,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-01-21 06:24:05,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-01-21 06:24:05,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 93 transitions. [2018-01-21 06:24:05,849 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 93 transitions. Word has length 21 [2018-01-21 06:24:05,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:24:05,850 INFO L432 AbstractCegarLoop]: Abstraction has 88 states and 93 transitions. [2018-01-21 06:24:05,850 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:24:05,850 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 93 transitions. [2018-01-21 06:24:05,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 06:24:05,852 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:05,852 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:24:05,852 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:24:05,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1311117136, now seen corresponding path program 1 times [2018-01-21 06:24:05,852 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:05,854 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:05,854 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:05,854 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:05,854 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:05,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:24:05,879 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:24:05,968 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 06:24:05,968 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:24:05,968 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:24:05,968 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:24:05,970 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:24:05,970 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:24:05,970 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:24:05,971 INFO L87 Difference]: Start difference. First operand 88 states and 93 transitions. Second operand 5 states. [2018-01-21 06:24:06,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:24:06,160 INFO L93 Difference]: Finished difference Result 139 states and 150 transitions. [2018-01-21 06:24:06,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:24:06,161 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 30 [2018-01-21 06:24:06,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:24:06,163 INFO L225 Difference]: With dead ends: 139 [2018-01-21 06:24:06,163 INFO L226 Difference]: Without dead ends: 120 [2018-01-21 06:24:06,165 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 06:24:06,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-01-21 06:24:06,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 92. [2018-01-21 06:24:06,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-01-21 06:24:06,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 97 transitions. [2018-01-21 06:24:06,175 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 97 transitions. Word has length 30 [2018-01-21 06:24:06,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:24:06,176 INFO L432 AbstractCegarLoop]: Abstraction has 92 states and 97 transitions. [2018-01-21 06:24:06,176 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:24:06,176 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 97 transitions. [2018-01-21 06:24:06,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 06:24:06,178 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:06,178 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] [2018-01-21 06:24:06,178 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:24:06,179 INFO L82 PathProgramCache]: Analyzing trace with hash 491544981, now seen corresponding path program 1 times [2018-01-21 06:24:06,179 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:06,181 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,181 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:06,181 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,181 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:06,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:24:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:24:06,242 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:24:06,253 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:24:06,259 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:24:06,260 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:24:06,274 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:24:06,275 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:24:06,275 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:24:06,275 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:24:06,275 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:24:06,275 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:24:06,275 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:24:06,275 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 06:24:06,275 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:24:06,278 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states. [2018-01-21 06:24:06,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:24:06,279 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:06,279 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:24:06,279 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 06:24:06,279 INFO L82 PathProgramCache]: Analyzing trace with hash 55172353, now seen corresponding path program 1 times [2018-01-21 06:24:06,279 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:06,281 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,281 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:06,281 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,281 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:06,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:24:06,292 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:24:06,307 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 06:24:06,307 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:24:06,307 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:24:06,307 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:24:06,308 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:24:06,308 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:24:06,308 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:24:06,308 INFO L87 Difference]: Start difference. First operand 91 states. Second operand 2 states. [2018-01-21 06:24:06,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:24:06,316 INFO L93 Difference]: Finished difference Result 170 states and 228 transitions. [2018-01-21 06:24:06,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:24:06,316 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2018-01-21 06:24:06,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:24:06,317 INFO L225 Difference]: With dead ends: 170 [2018-01-21 06:24:06,317 INFO L226 Difference]: Without dead ends: 86 [2018-01-21 06:24:06,318 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:24:06,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-01-21 06:24:06,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2018-01-21 06:24:06,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 06:24:06,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2018-01-21 06:24:06,323 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 19 [2018-01-21 06:24:06,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:24:06,323 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2018-01-21 06:24:06,323 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:24:06,323 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2018-01-21 06:24:06,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 06:24:06,324 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:06,324 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] [2018-01-21 06:24:06,324 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 06:24:06,324 INFO L82 PathProgramCache]: Analyzing trace with hash 2057227957, now seen corresponding path program 1 times [2018-01-21 06:24:06,324 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:06,326 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,326 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:06,326 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,326 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:06,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:24:06,339 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:24:06,400 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 06:24:06,401 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:24:06,401 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:24:06,401 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:24:06,401 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:24:06,402 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:24:06,402 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:24:06,402 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand 5 states. [2018-01-21 06:24:06,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:24:06,550 INFO L93 Difference]: Finished difference Result 135 states and 146 transitions. [2018-01-21 06:24:06,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:24:06,551 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2018-01-21 06:24:06,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:24:06,552 INFO L225 Difference]: With dead ends: 135 [2018-01-21 06:24:06,553 INFO L226 Difference]: Without dead ends: 118 [2018-01-21 06:24:06,553 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 06:24:06,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-01-21 06:24:06,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 90. [2018-01-21 06:24:06,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-01-21 06:24:06,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2018-01-21 06:24:06,561 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 28 [2018-01-21 06:24:06,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:24:06,561 INFO L432 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2018-01-21 06:24:06,561 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:24:06,562 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2018-01-21 06:24:06,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 06:24:06,563 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:24:06,563 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] [2018-01-21 06:24:06,564 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 06:24:06,564 INFO L82 PathProgramCache]: Analyzing trace with hash 894365242, now seen corresponding path program 1 times [2018-01-21 06:24:06,564 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:24:06,566 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,566 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:24:06,566 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:24:06,567 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:24:06,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:24:06,587 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:24:06,728 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 06:24:06,729 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:24:06,729 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:24:06,730 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 43 with the following transitions: [2018-01-21 06:24:06,732 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [4], [5], [9], [11], [14], [99], [103], [108], [112], [120], [121], [126], [130], [138], [142], [144], [145], [188], [190], [191], [197], [201], [203], [204], [215], [216], [217], [218], [219], [224], [226], [227], [228], [234], [235], [236] [2018-01-21 06:24:06,793 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:24:06,794 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