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_preciseopt.epf -i ../../../trunk/examples/svcomp/heap-manipulation/dancing_true-unreach-call_false-valid-memtrack.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:57:56,572 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:57:56,573 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:57:56,588 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:57:56,589 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:57:56,590 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:57:56,591 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:57:56,592 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:57:56,594 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:57:56,595 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:57:56,596 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:57:56,596 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:57:56,597 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:57:56,598 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:57:56,599 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:57:56,602 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:57:56,604 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:57:56,606 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:57:56,607 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:57:56,609 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:57:56,611 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:57:56,616 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:57:56,617 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:57:56,617 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_preciseopt.epf [2018-01-21 08:57:56,626 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:57:56,626 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:57:56,627 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:57:56,627 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:57:56,627 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:57:56,627 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:57:56,627 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:57:56,627 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:57:56,627 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:57:56,628 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:57:56,628 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:57:56,628 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:57:56,628 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:57:56,629 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:57:56,630 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:57:56,630 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:57:56,630 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:57:56,630 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:57:56,630 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:57:56,631 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:57:56,631 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:57:56,632 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:57:56,632 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:57:56,632 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:57:56,632 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:57:56,633 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:57:56,666 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:57:56,676 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:57:56,680 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:57:56,681 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:57:56,682 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:57:56,682 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/heap-manipulation/dancing_true-unreach-call_false-valid-memtrack.i [2018-01-21 08:57:56,847 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:57:56,852 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:57:56,853 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:57:56,853 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:57:56,859 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:57:56,860 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:57:56" (1/1) ... [2018-01-21 08:57:56,863 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bbe2813 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:56, skipping insertion in model container [2018-01-21 08:57:56,864 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:57:56" (1/1) ... [2018-01-21 08:57:56,878 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:57:56,918 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:57:57,042 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:57:57,064 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:57:57,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57 WrapperNode [2018-01-21 08:57:57,074 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:57:57,075 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:57:57,075 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:57:57,076 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:57:57,093 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,093 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,103 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,104 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,111 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,116 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,118 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (1/1) ... [2018-01-21 08:57:57,120 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:57:57,121 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:57:57,121 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:57:57,121 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:57:57,122 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (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 08:57:57,171 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:57:57,171 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:57:57,171 INFO L136 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-01-21 08:57:57,171 INFO L136 BoogieDeclarations]: Found implementation of procedure remove [2018-01-21 08:57:57,171 INFO L136 BoogieDeclarations]: Found implementation of procedure re_insert [2018-01-21 08:57:57,172 INFO L136 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2018-01-21 08:57:57,172 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:57:57,172 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 08:57:57,172 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 08:57:57,172 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:57:57,172 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:57:57,173 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:57:57,173 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2018-01-21 08:57:57,173 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2018-01-21 08:57:57,173 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-21 08:57:57,173 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-01-21 08:57:57,173 INFO L128 BoogieDeclarations]: Found specification of procedure remove [2018-01-21 08:57:57,174 INFO L128 BoogieDeclarations]: Found specification of procedure re_insert [2018-01-21 08:57:57,174 INFO L128 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2018-01-21 08:57:57,174 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:57:57,174 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:57:57,174 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:57:57,492 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:57:57,493 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:57:57 BoogieIcfgContainer [2018-01-21 08:57:57,493 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:57:57,494 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:57:57,494 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:57:57,496 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:57:57,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:57:56" (1/3) ... [2018-01-21 08:57:57,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7821a16c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:57:57, skipping insertion in model container [2018-01-21 08:57:57,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:57:57" (2/3) ... [2018-01-21 08:57:57,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7821a16c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:57:57, skipping insertion in model container [2018-01-21 08:57:57,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:57:57" (3/3) ... [2018-01-21 08:57:57,500 INFO L105 eAbstractionObserver]: Analyzing ICFG dancing_true-unreach-call_false-valid-memtrack.i [2018-01-21 08:57:57,507 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:57:57,515 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2018-01-21 08:57:57,552 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:57:57,552 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:57:57,552 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:57:57,552 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:57:57,552 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:57:57,553 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:57:57,553 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:57:57,553 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:57:57,554 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:57:57,571 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states. [2018-01-21 08:57:57,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:57:57,576 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:57,577 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:57:57,577 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:57:57,581 INFO L82 PathProgramCache]: Analyzing trace with hash 178905, now seen corresponding path program 1 times [2018-01-21 08:57:57,583 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:57,623 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:57,623 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:57,623 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:57,623 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:57,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:57:57,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:57:57,676 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:57:57,682 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:57,689 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:57:57,690 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:57:57,690 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:57:57,690 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:57:57,690 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:57:57,690 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:57:57,690 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:57:57,691 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == re_insertErr0EnsuresViolation======== [2018-01-21 08:57:57,691 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:57:57,694 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states. [2018-01-21 08:57:57,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 08:57:57,697 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:57,697 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 08:57:57,697 INFO L371 AbstractCegarLoop]: === Iteration 1 === [re_insertErr0EnsuresViolation]=== [2018-01-21 08:57:57,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1611447727, now seen corresponding path program 1 times [2018-01-21 08:57:57,698 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:57,699 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:57,699 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:57,699 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:57,699 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:57,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:57:57,730 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:57:57,788 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 08:57:57,790 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:57:57,790 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:57:57,790 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:57:57,795 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:57:57,886 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:57:57,887 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:57:57,890 INFO L87 Difference]: Start difference. First operand 86 states. Second operand 2 states. [2018-01-21 08:57:57,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:57:57,921 INFO L93 Difference]: Finished difference Result 149 states and 181 transitions. [2018-01-21 08:57:57,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:57:57,922 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 39 [2018-01-21 08:57:57,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:57:57,927 INFO L225 Difference]: With dead ends: 149 [2018-01-21 08:57:57,927 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:57:57,930 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 08:57:57,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:57:57,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:57:57,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:57:57,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:57:57,949 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 39 [2018-01-21 08:57:57,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:57:57,949 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:57:57,949 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:57:57,949 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:57:57,950 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:57:57,952 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:57:57,952 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:57:57,952 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:57:57,952 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:57:57,952 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:57:57,953 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:57:57,953 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:57:57,953 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:57:57,953 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:57:57,955 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states. [2018-01-21 08:57:57,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-01-21 08:57:57,957 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:57,957 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:57:57,957 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:57:57,957 INFO L82 PathProgramCache]: Analyzing trace with hash -715233718, now seen corresponding path program 1 times [2018-01-21 08:57:57,957 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:57,958 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:57,959 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:57,959 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:57,959 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:57,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:57:57,975 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:57:58,004 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 08:57:58,005 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:57:58,005 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:57:58,005 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:57:58,006 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:57:58,006 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:57:58,006 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:57:58,006 INFO L87 Difference]: Start difference. First operand 86 states. Second operand 2 states. [2018-01-21 08:57:58,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:57:58,018 INFO L93 Difference]: Finished difference Result 149 states and 181 transitions. [2018-01-21 08:57:58,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:57:58,019 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 56 [2018-01-21 08:57:58,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:57:58,023 INFO L225 Difference]: With dead ends: 149 [2018-01-21 08:57:58,023 INFO L226 Difference]: Without dead ends: 78 [2018-01-21 08:57:58,024 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 08:57:58,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-01-21 08:57:58,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-01-21 08:57:58,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 08:57:58,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 91 transitions. [2018-01-21 08:57:58,046 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 91 transitions. Word has length 56 [2018-01-21 08:57:58,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:57:58,046 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 91 transitions. [2018-01-21 08:57:58,046 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:57:58,047 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 91 transitions. [2018-01-21 08:57:58,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 08:57:58,050 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:58,051 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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] [2018-01-21 08:57:58,051 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:57:58,051 INFO L82 PathProgramCache]: Analyzing trace with hash 675519653, now seen corresponding path program 1 times [2018-01-21 08:57:58,051 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:58,053 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,054 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:58,054 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,054 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:58,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:57:58,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:57:58,151 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:57:58,162 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,164 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,166 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,167 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,168 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,170 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,170 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,171 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,172 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:57:58,187 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:57:58,187 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:57:58,187 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:57:58,187 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:57:58,187 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:57:58,187 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:57:58,188 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:57:58,188 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 08:57:58,188 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:57:58,190 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states. [2018-01-21 08:57:58,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-01-21 08:57:58,193 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:58,193 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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] [2018-01-21 08:57:58,193 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 08:57:58,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1572438346, now seen corresponding path program 1 times [2018-01-21 08:57:58,194 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:58,195 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,195 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:58,195 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,195 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:58,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:57:58,205 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:57:58,228 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 08:57:58,228 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:57:58,228 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:57:58,228 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:57:58,229 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:57:58,229 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:57:58,229 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:57:58,229 INFO L87 Difference]: Start difference. First operand 86 states. Second operand 2 states. [2018-01-21 08:57:58,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:57:58,239 INFO L93 Difference]: Finished difference Result 149 states and 181 transitions. [2018-01-21 08:57:58,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:57:58,240 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 54 [2018-01-21 08:57:58,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:57:58,241 INFO L225 Difference]: With dead ends: 149 [2018-01-21 08:57:58,242 INFO L226 Difference]: Without dead ends: 76 [2018-01-21 08:57:58,243 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 08:57:58,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-21 08:57:58,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-01-21 08:57:58,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-01-21 08:57:58,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2018-01-21 08:57:58,251 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 54 [2018-01-21 08:57:58,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:57:58,251 INFO L432 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2018-01-21 08:57:58,251 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:57:58,251 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2018-01-21 08:57:58,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-01-21 08:57:58,253 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:58,253 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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] [2018-01-21 08:57:58,253 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 08:57:58,254 INFO L82 PathProgramCache]: Analyzing trace with hash 362713701, now seen corresponding path program 1 times [2018-01-21 08:57:58,254 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:58,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,254 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:58,255 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,255 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:58,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:57:58,277 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:57:58,411 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 08:57:58,412 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:57:58,412 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:57:58,412 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:57:58,412 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 08:57:58,413 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 08:57:58,413 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 08:57:58,413 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand 4 states. [2018-01-21 08:57:58,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:57:58,745 INFO L93 Difference]: Finished difference Result 96 states and 117 transitions. [2018-01-21 08:57:58,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:57:58,746 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 55 [2018-01-21 08:57:58,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:57:58,748 INFO L225 Difference]: With dead ends: 96 [2018-01-21 08:57:58,748 INFO L226 Difference]: Without dead ends: 79 [2018-01-21 08:57:58,749 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:57:58,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-21 08:57:58,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-01-21 08:57:58,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 08:57:58,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 91 transitions. [2018-01-21 08:57:58,759 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 91 transitions. Word has length 55 [2018-01-21 08:57:58,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:57:58,759 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 91 transitions. [2018-01-21 08:57:58,759 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 08:57:58,759 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 91 transitions. [2018-01-21 08:57:58,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-01-21 08:57:58,762 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:58,762 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:57:58,762 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 08:57:58,762 INFO L82 PathProgramCache]: Analyzing trace with hash 2096216182, now seen corresponding path program 1 times [2018-01-21 08:57:58,763 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:58,764 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,764 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:58,764 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,764 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:58,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:57:58,777 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:57:58,811 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 08:57:58,812 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:57:58,812 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 08:57:58,812 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:57:58,812 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 08:57:58,813 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 08:57:58,813 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 08:57:58,813 INFO L87 Difference]: Start difference. First operand 78 states and 91 transitions. Second operand 4 states. [2018-01-21 08:57:58,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:57:58,847 INFO L93 Difference]: Finished difference Result 138 states and 161 transitions. [2018-01-21 08:57:58,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:57:58,848 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 58 [2018-01-21 08:57:58,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:57:58,850 INFO L225 Difference]: With dead ends: 138 [2018-01-21 08:57:58,850 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 08:57:58,851 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:57:58,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 08:57:58,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2018-01-21 08:57:58,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 08:57:58,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 90 transitions. [2018-01-21 08:57:58,860 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 90 transitions. Word has length 58 [2018-01-21 08:57:58,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:57:58,860 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 90 transitions. [2018-01-21 08:57:58,860 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 08:57:58,860 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 90 transitions. [2018-01-21 08:57:58,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-01-21 08:57:58,861 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:57:58,861 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 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] [2018-01-21 08:57:58,861 INFO L371 AbstractCegarLoop]: === Iteration 4 === [mainErr0EnsuresViolation]=== [2018-01-21 08:57:58,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1351865632, now seen corresponding path program 1 times [2018-01-21 08:57:58,861 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:57:58,862 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,862 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:57:58,862 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:57:58,863 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:57:58,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:57:58,874 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:57:58,974 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-01-21 08:57:58,974 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:57:58,974 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:57:58,975 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 65 with the following transitions: [2018-01-21 08:57:58,978 INFO L201 CegarAbsIntRunner]: [0], [1], [2], [3], [7], [11], [13], [14], [15], [20], [21], [22], [23], [26], [34], [36], [39], [46], [50], [51], [52], [54], [55], [58], [68], [70], [71], [80], [82], [91], [93], [95], [96], [98], [99], [107], [109], [117], [119], [125], [132], [134], [136], [137], [138], [139], [142], [143], [144], [145], [146], [147], [148], [149], [152], [153], [154] [2018-01-21 08:57:59,033 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:57:59,033 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