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-01_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:21:47,498 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:21:47,514 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:21:47,529 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:21:47,530 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:21:47,531 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:21:47,532 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:21:47,534 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:21:47,536 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:21:47,537 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:21:47,538 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:21:47,538 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:21:47,540 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:21:47,541 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:21:47,542 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:21:47,545 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:21:47,547 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:21:47,549 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:21:47,551 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:21:47,552 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:21:47,554 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:21:47,554 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:21:47,555 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:21:47,556 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:21:47,556 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:21:47,557 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:21:47,558 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:21:47,558 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:21:47,558 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:21:47,559 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:21:47,559 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:21:47,560 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 06:21:47,568 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:21:47,568 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:21:47,569 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:21:47,569 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:21:47,569 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:21:47,569 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:21:47,569 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:21:47,570 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:21:47,570 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:21:47,570 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:21:47,570 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:21:47,570 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:21:47,570 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:21:47,571 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:21:47,572 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:21:47,572 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:21:47,572 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:21:47,572 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:21:47,572 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:21:47,573 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:21:47,573 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:21:47,574 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:21:47,574 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:21:47,574 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:21:47,574 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:21:47,606 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:21:47,618 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:21:47,621 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:21:47,622 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:21:47,622 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:21:47,623 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-01_true-unreach-call_true-valid-memsafety.i [2018-01-21 06:21:47,808 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:21:47,814 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:21:47,815 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:21:47,815 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:21:47,821 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:21:47,821 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:21:47" (1/1) ... [2018-01-21 06:21:47,824 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b6225bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:47, skipping insertion in model container [2018-01-21 06:21:47,824 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:21:47" (1/1) ... [2018-01-21 06:21:47,843 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:21:47,885 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:21:48,007 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:21:48,031 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:21:48,040 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48 WrapperNode [2018-01-21 06:21:48,040 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:21:48,041 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:21:48,041 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:21:48,041 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:21:48,052 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,052 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,062 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,063 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,069 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,074 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,076 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (1/1) ... [2018-01-21 06:21:48,080 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:21:48,080 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:21:48,080 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:21:48,081 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:21:48,082 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (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 06:21:48,136 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:21:48,136 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:21:48,136 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:21:48,136 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 06:21:48,136 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:21:48,137 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:21:48,638 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:21:48,639 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:21:48 BoogieIcfgContainer [2018-01-21 06:21:48,640 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:21:48,641 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:21:48,641 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:21:48,643 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:21:48,643 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:21:47" (1/3) ... [2018-01-21 06:21:48,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4069a364 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:21:48, skipping insertion in model container [2018-01-21 06:21:48,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:21:48" (2/3) ... [2018-01-21 06:21:48,645 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4069a364 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:21:48, skipping insertion in model container [2018-01-21 06:21:48,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:21:48" (3/3) ... [2018-01-21 06:21:48,646 INFO L105 eAbstractionObserver]: Analyzing ICFG dll-01_true-unreach-call_true-valid-memsafety.i [2018-01-21 06:21:48,653 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:21:48,660 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 06:21:48,700 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:21:48,700 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:21:48,700 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:21:48,701 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:21:48,701 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:21:48,701 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:21:48,701 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:21:48,701 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:21:48,702 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:21:48,720 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states. [2018-01-21 06:21:48,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:21:48,726 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:48,727 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:21:48,727 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:21:48,731 INFO L82 PathProgramCache]: Analyzing trace with hash 396895, now seen corresponding path program 1 times [2018-01-21 06:21:48,733 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:48,775 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:48,776 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:48,776 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:48,776 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:48,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:21:48,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:21:48,830 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:21:48,836 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:21:48,845 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:21:48,845 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:21:48,845 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:21:48,845 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:21:48,845 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:21:48,846 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:21:48,846 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:21:48,846 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:21:48,846 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:21:48,850 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states. [2018-01-21 06:21:48,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 06:21:48,853 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:48,853 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] [2018-01-21 06:21:48,853 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:21:48,854 INFO L82 PathProgramCache]: Analyzing trace with hash -1539010196, now seen corresponding path program 1 times [2018-01-21 06:21:48,854 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:48,855 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:48,855 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:48,855 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:48,855 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:48,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:48,881 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:48,918 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 06:21:48,919 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:21:48,920 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:21:48,920 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:21:48,923 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:21:49,020 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:21:49,021 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:21:49,023 INFO L87 Difference]: Start difference. First operand 127 states. Second operand 2 states. [2018-01-21 06:21:49,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:21:49,057 INFO L93 Difference]: Finished difference Result 244 states and 348 transitions. [2018-01-21 06:21:49,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:21:49,058 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 24 [2018-01-21 06:21:49,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:21:49,070 INFO L225 Difference]: With dead ends: 244 [2018-01-21 06:21:49,070 INFO L226 Difference]: Without dead ends: 124 [2018-01-21 06:21:49,073 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 06:21:49,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-01-21 06:21:49,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-01-21 06:21:49,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-01-21 06:21:49,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2018-01-21 06:21:49,111 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 24 [2018-01-21 06:21:49,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:21:49,111 INFO L432 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2018-01-21 06:21:49,111 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:21:49,112 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2018-01-21 06:21:49,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 06:21:49,113 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:49,113 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] [2018-01-21 06:21:49,113 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:21:49,113 INFO L82 PathProgramCache]: Analyzing trace with hash 849242386, now seen corresponding path program 1 times [2018-01-21 06:21:49,113 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:49,114 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,114 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:49,115 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,115 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:49,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:49,137 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:49,278 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 06:21:49,278 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:21:49,279 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:21:49,279 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:21:49,280 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:21:49,280 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:21:49,281 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:21:49,281 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 5 states. [2018-01-21 06:21:49,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:21:49,584 INFO L93 Difference]: Finished difference Result 287 states and 310 transitions. [2018-01-21 06:21:49,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:21:49,585 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 37 [2018-01-21 06:21:49,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:21:49,589 INFO L225 Difference]: With dead ends: 287 [2018-01-21 06:21:49,590 INFO L226 Difference]: Without dead ends: 192 [2018-01-21 06:21:49,591 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:21:49,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-01-21 06:21:49,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 128. [2018-01-21 06:21:49,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-01-21 06:21:49,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2018-01-21 06:21:49,600 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 37 [2018-01-21 06:21:49,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:21:49,600 INFO L432 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2018-01-21 06:21:49,600 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:21:49,600 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2018-01-21 06:21:49,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 06:21:49,601 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:49,601 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] [2018-01-21 06:21:49,601 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:21:49,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1513386891, now seen corresponding path program 1 times [2018-01-21 06:21:49,602 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:49,602 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,602 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:49,603 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,603 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:49,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:49,620 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:49,686 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 06:21:49,686 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:21:49,686 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:21:49,686 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:21:49,687 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:21:49,687 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:21:49,687 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:21:49,687 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 5 states. [2018-01-21 06:21:49,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:21:49,834 INFO L93 Difference]: Finished difference Result 213 states and 229 transitions. [2018-01-21 06:21:49,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:21:49,835 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 06:21:49,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:21:49,837 INFO L225 Difference]: With dead ends: 213 [2018-01-21 06:21:49,838 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 06:21:49,838 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 06:21:49,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 06:21:49,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 132. [2018-01-21 06:21:49,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-01-21 06:21:49,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 141 transitions. [2018-01-21 06:21:49,851 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 141 transitions. Word has length 39 [2018-01-21 06:21:49,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:21:49,852 INFO L432 AbstractCegarLoop]: Abstraction has 132 states and 141 transitions. [2018-01-21 06:21:49,852 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:21:49,852 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 141 transitions. [2018-01-21 06:21:49,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-01-21 06:21:49,855 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:49,855 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] [2018-01-21 06:21:49,855 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:21:49,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1547435689, now seen corresponding path program 1 times [2018-01-21 06:21:49,855 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:49,856 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,856 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:49,857 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,857 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:49,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:21:49,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:21:49,923 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:21:49,935 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:21:49,946 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:21:49,946 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:21:49,966 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:21:49,967 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:21:49,967 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:21:49,967 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:21:49,967 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:21:49,967 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:21:49,967 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:21:49,967 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 06:21:49,967 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:21:49,970 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states. [2018-01-21 06:21:49,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 06:21:49,971 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:49,971 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] [2018-01-21 06:21:49,971 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 06:21:49,972 INFO L82 PathProgramCache]: Analyzing trace with hash 565995656, now seen corresponding path program 1 times [2018-01-21 06:21:49,972 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:49,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,973 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:49,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:49,973 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:49,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:49,980 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:49,990 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 06:21:49,991 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:21:49,991 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:21:49,991 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:21:49,991 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:21:49,992 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:21:49,992 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:21:49,992 INFO L87 Difference]: Start difference. First operand 127 states. Second operand 2 states. [2018-01-21 06:21:49,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:21:49,997 INFO L93 Difference]: Finished difference Result 244 states and 348 transitions. [2018-01-21 06:21:49,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:21:49,997 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2018-01-21 06:21:49,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:21:49,998 INFO L225 Difference]: With dead ends: 244 [2018-01-21 06:21:49,998 INFO L226 Difference]: Without dead ends: 122 [2018-01-21 06:21:49,999 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 06:21:49,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-01-21 06:21:50,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2018-01-21 06:21:50,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-01-21 06:21:50,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 131 transitions. [2018-01-21 06:21:50,008 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 131 transitions. Word has length 22 [2018-01-21 06:21:50,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:21:50,009 INFO L432 AbstractCegarLoop]: Abstraction has 122 states and 131 transitions. [2018-01-21 06:21:50,009 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:21:50,009 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 131 transitions. [2018-01-21 06:21:50,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 06:21:50,010 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:50,010 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] [2018-01-21 06:21:50,010 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 06:21:50,010 INFO L82 PathProgramCache]: Analyzing trace with hash -673975890, now seen corresponding path program 1 times [2018-01-21 06:21:50,011 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:50,012 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:50,012 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:50,012 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:50,012 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:50,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:50,024 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:50,079 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 06:21:50,080 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:21:50,080 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:21:50,080 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:21:50,080 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:21:50,080 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:21:50,080 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:21:50,081 INFO L87 Difference]: Start difference. First operand 122 states and 131 transitions. Second operand 5 states. [2018-01-21 06:21:50,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:21:50,222 INFO L93 Difference]: Finished difference Result 283 states and 305 transitions. [2018-01-21 06:21:50,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:21:50,222 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-01-21 06:21:50,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:21:50,224 INFO L225 Difference]: With dead ends: 283 [2018-01-21 06:21:50,224 INFO L226 Difference]: Without dead ends: 190 [2018-01-21 06:21:50,225 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 06:21:50,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-01-21 06:21:50,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 126. [2018-01-21 06:21:50,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-01-21 06:21:50,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2018-01-21 06:21:50,235 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 35 [2018-01-21 06:21:50,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:21:50,236 INFO L432 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2018-01-21 06:21:50,236 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:21:50,236 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2018-01-21 06:21:50,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 06:21:50,238 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:50,238 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] [2018-01-21 06:21:50,238 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 06:21:50,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1839763921, now seen corresponding path program 1 times [2018-01-21 06:21:50,239 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:50,240 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:50,240 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:50,240 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:50,240 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:50,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:50,263 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:50,314 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 06:21:50,314 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:21:50,314 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:21:50,315 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:21:50,316 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:21:50,316 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:21:50,316 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:21:50,316 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 5 states. [2018-01-21 06:21:50,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:21:50,419 INFO L93 Difference]: Finished difference Result 209 states and 225 transitions. [2018-01-21 06:21:50,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:21:50,420 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 37 [2018-01-21 06:21:50,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:21:50,421 INFO L225 Difference]: With dead ends: 209 [2018-01-21 06:21:50,422 INFO L226 Difference]: Without dead ends: 184 [2018-01-21 06:21:50,422 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 06:21:50,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-01-21 06:21:50,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 130. [2018-01-21 06:21:50,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-01-21 06:21:50,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 139 transitions. [2018-01-21 06:21:50,431 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 139 transitions. Word has length 37 [2018-01-21 06:21:50,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:21:50,431 INFO L432 AbstractCegarLoop]: Abstraction has 130 states and 139 transitions. [2018-01-21 06:21:50,431 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:21:50,432 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 139 transitions. [2018-01-21 06:21:50,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 06:21:50,433 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:21:50,433 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] [2018-01-21 06:21:50,434 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 06:21:50,434 INFO L82 PathProgramCache]: Analyzing trace with hash 171442437, now seen corresponding path program 1 times [2018-01-21 06:21:50,434 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:21:50,435 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:50,435 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:21:50,435 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:21:50,435 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:21:50,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:21:50,455 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:21:50,605 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 06:21:50,605 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:21:50,605 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:21:50,606 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 58 with the following transitions: [2018-01-21 06:21:50,607 INFO L201 CegarAbsIntRunner]: [0], [1], [7], [8], [9], [10], [14], [19], [23], [29], [32], [33], [47], [48], [49], [54], [55], [56], [62], [66], [72], [76], [78], [81], [173], [177], [182], [186], [194], [198], [200], [201], [202], [206], [210], [279], [284], [288], [294], [295], [301], [305], [307], [308], [309], [370], [372], [373], [374], [375], [379], [381], [382], [383], [384] [2018-01-21 06:21:50,662 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:21:50,662 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