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/memsafety-ext/tree_parent_ptr_true-valid-memsafety_false-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 05:48:22,543 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 05:48:22,545 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 05:48:22,560 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 05:48:22,560 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 05:48:22,561 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 05:48:22,563 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 05:48:22,565 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 05:48:22,567 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 05:48:22,568 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 05:48:22,569 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 05:48:22,569 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 05:48:22,570 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 05:48:22,571 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 05:48:22,572 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 05:48:22,575 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 05:48:22,577 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 05:48:22,580 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 05:48:22,581 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 05:48:22,582 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 05:48:22,585 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 05:48:22,592 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 05:48:22,602 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 05:48:22,602 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 05:48:22,603 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 05:48:22,603 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 05:48:22,604 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 05:48:22,604 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 05:48:22,604 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 05:48:22,604 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 05:48:22,605 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 05:48:22,605 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 05:48:22,605 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 05:48:22,606 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 05:48:22,606 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 05:48:22,606 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 05:48:22,606 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 05:48:22,606 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 05:48:22,606 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 05:48:22,607 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 05:48:22,607 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 05:48:22,607 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 05:48:22,607 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 05:48:22,607 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 05:48:22,608 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 05:48:22,608 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 05:48:22,608 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 05:48:22,608 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 05:48:22,608 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 05:48:22,609 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 05:48:22,609 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 05:48:22,609 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 05:48:22,609 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 05:48:22,609 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 05:48:22,609 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 05:48:22,610 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 05:48:22,610 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 05:48:22,610 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 05:48:22,610 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 05:48:22,611 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 05:48:22,611 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 05:48:22,649 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 05:48:22,663 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 05:48:22,668 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 05:48:22,670 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 05:48:22,670 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 05:48:22,671 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety-ext/tree_parent_ptr_true-valid-memsafety_false-termination.i [2018-01-21 05:48:22,876 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 05:48:22,879 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 05:48:22,880 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 05:48:22,880 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 05:48:22,885 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 05:48:22,886 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 05:48:22" (1/1) ... [2018-01-21 05:48:22,888 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7feccdb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:22, skipping insertion in model container [2018-01-21 05:48:22,889 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 05:48:22" (1/1) ... [2018-01-21 05:48:22,905 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 05:48:22,943 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 05:48:23,060 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 05:48:23,081 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 05:48:23,091 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23 WrapperNode [2018-01-21 05:48:23,091 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 05:48:23,092 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 05:48:23,092 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 05:48:23,092 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 05:48:23,106 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,106 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,115 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,115 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,122 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,127 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,128 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (1/1) ... [2018-01-21 05:48:23,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 05:48:23,131 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 05:48:23,131 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 05:48:23,131 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 05:48:23,132 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (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 05:48:23,177 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 05:48:23,178 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 05:48:23,178 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 05:48:23,178 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 05:48:23,178 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 05:48:23,178 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 05:48:23,178 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 05:48:23,178 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 05:48:23,179 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 05:48:23,179 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 05:48:23,179 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 05:48:23,179 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 05:48:23,179 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 05:48:23,179 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 05:48:23,553 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 05:48:23,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 05:48:23 BoogieIcfgContainer [2018-01-21 05:48:23,589 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 05:48:23,590 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 05:48:23,590 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 05:48:23,592 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 05:48:23,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 05:48:22" (1/3) ... [2018-01-21 05:48:23,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4773c4c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 05:48:23, skipping insertion in model container [2018-01-21 05:48:23,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:48:23" (2/3) ... [2018-01-21 05:48:23,594 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4773c4c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 05:48:23, skipping insertion in model container [2018-01-21 05:48:23,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 05:48:23" (3/3) ... [2018-01-21 05:48:23,595 INFO L105 eAbstractionObserver]: Analyzing ICFG tree_parent_ptr_true-valid-memsafety_false-termination.i [2018-01-21 05:48:23,603 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 05:48:23,611 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 05:48:23,663 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:48:23,663 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:48:23,663 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:48:23,663 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:48:23,664 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:48:23,664 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:48:23,664 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:48:23,664 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 05:48:23,665 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:48:23,687 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states. [2018-01-21 05:48:23,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 05:48:23,694 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:23,695 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 05:48:23,695 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 05:48:23,701 INFO L82 PathProgramCache]: Analyzing trace with hash 185475, now seen corresponding path program 1 times [2018-01-21 05:48:23,703 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:23,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:23,755 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:23,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:23,755 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:23,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:48:23,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:48:23,810 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 05:48:23,817 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:48:23,827 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:48:23,827 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:48:23,827 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:48:23,827 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:48:23,827 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:48:23,828 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:48:23,828 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:48:23,828 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 05:48:23,828 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:48:23,832 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states. [2018-01-21 05:48:23,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 05:48:23,834 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:23,834 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:48:23,834 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:48:23,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1602735979, now seen corresponding path program 1 times [2018-01-21 05:48:23,835 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:23,836 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:23,836 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:23,836 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:23,836 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:23,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:48:23,870 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:48:23,915 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 05:48:23,917 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:48:23,918 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:48:23,918 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:48:23,921 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 05:48:24,015 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 05:48:24,016 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 05:48:24,019 INFO L87 Difference]: Start difference. First operand 92 states. Second operand 2 states. [2018-01-21 05:48:24,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:48:24,044 INFO L93 Difference]: Finished difference Result 173 states and 199 transitions. [2018-01-21 05:48:24,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 05:48:24,045 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2018-01-21 05:48:24,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:48:24,058 INFO L225 Difference]: With dead ends: 173 [2018-01-21 05:48:24,059 INFO L226 Difference]: Without dead ends: 89 [2018-01-21 05:48:24,062 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 05:48:24,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-01-21 05:48:24,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-01-21 05:48:24,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 05:48:24,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 99 transitions. [2018-01-21 05:48:24,102 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 99 transitions. Word has length 21 [2018-01-21 05:48:24,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:48:24,102 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 99 transitions. [2018-01-21 05:48:24,102 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 05:48:24,102 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 99 transitions. [2018-01-21 05:48:24,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 05:48:24,103 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:24,103 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 05:48:24,103 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:48:24,104 INFO L82 PathProgramCache]: Analyzing trace with hash 553744969, now seen corresponding path program 1 times [2018-01-21 05:48:24,104 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:24,105 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,105 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:24,105 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,105 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:24,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:48:24,129 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:48:24,199 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 05:48:24,200 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:48:24,200 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 05:48:24,200 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:48:24,202 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 05:48:24,202 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 05:48:24,203 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 05:48:24,203 INFO L87 Difference]: Start difference. First operand 89 states and 99 transitions. Second operand 4 states. [2018-01-21 05:48:24,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:48:24,263 INFO L93 Difference]: Finished difference Result 98 states and 108 transitions. [2018-01-21 05:48:24,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 05:48:24,263 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2018-01-21 05:48:24,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:48:24,265 INFO L225 Difference]: With dead ends: 98 [2018-01-21 05:48:24,265 INFO L226 Difference]: Without dead ends: 93 [2018-01-21 05:48:24,266 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 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 05:48:24,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-01-21 05:48:24,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2018-01-21 05:48:24,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 05:48:24,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 101 transitions. [2018-01-21 05:48:24,273 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 101 transitions. Word has length 24 [2018-01-21 05:48:24,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:48:24,273 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 101 transitions. [2018-01-21 05:48:24,273 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 05:48:24,274 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 101 transitions. [2018-01-21 05:48:24,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 05:48:24,275 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:24,275 INFO L322 BasicCegarLoop]: trace histogram [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] [2018-01-21 05:48:24,275 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:48:24,275 INFO L82 PathProgramCache]: Analyzing trace with hash -1841085354, now seen corresponding path program 1 times [2018-01-21 05:48:24,275 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:24,276 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,276 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:24,276 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,276 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:24,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:48:24,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:48:24,349 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 05:48:24,357 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:48:24,363 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:48:24,363 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:48:24,375 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:48:24,376 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:48:24,376 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:48:24,376 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:48:24,376 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:48:24,376 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:48:24,376 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:48:24,376 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 05:48:24,376 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:48:24,378 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states. [2018-01-21 05:48:24,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 05:48:24,379 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:24,379 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:48:24,379 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 05:48:24,379 INFO L82 PathProgramCache]: Analyzing trace with hash 2000564629, now seen corresponding path program 1 times [2018-01-21 05:48:24,379 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:24,380 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,380 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:24,380 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,380 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:24,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:48:24,391 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:48:24,406 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 05:48:24,406 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:48:24,406 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:48:24,406 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:48:24,406 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 05:48:24,406 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 05:48:24,407 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 05:48:24,407 INFO L87 Difference]: Start difference. First operand 92 states. Second operand 2 states. [2018-01-21 05:48:24,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:48:24,413 INFO L93 Difference]: Finished difference Result 173 states and 199 transitions. [2018-01-21 05:48:24,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 05:48:24,413 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 19 [2018-01-21 05:48:24,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:48:24,414 INFO L225 Difference]: With dead ends: 173 [2018-01-21 05:48:24,414 INFO L226 Difference]: Without dead ends: 87 [2018-01-21 05:48:24,415 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 05:48:24,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-01-21 05:48:24,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-01-21 05:48:24,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-21 05:48:24,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 97 transitions. [2018-01-21 05:48:24,421 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 97 transitions. Word has length 19 [2018-01-21 05:48:24,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:48:24,421 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 97 transitions. [2018-01-21 05:48:24,421 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 05:48:24,421 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 97 transitions. [2018-01-21 05:48:24,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 05:48:24,422 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:24,422 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 05:48:24,422 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 05:48:24,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1791600567, now seen corresponding path program 1 times [2018-01-21 05:48:24,422 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:24,423 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,423 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:24,423 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,423 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:24,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:48:24,437 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:48:24,473 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 05:48:24,473 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:48:24,473 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 05:48:24,473 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:48:24,474 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 05:48:24,474 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 05:48:24,474 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 05:48:24,475 INFO L87 Difference]: Start difference. First operand 87 states and 97 transitions. Second operand 4 states. [2018-01-21 05:48:24,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:48:24,501 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2018-01-21 05:48:24,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 05:48:24,502 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2018-01-21 05:48:24,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:48:24,503 INFO L225 Difference]: With dead ends: 94 [2018-01-21 05:48:24,503 INFO L226 Difference]: Without dead ends: 91 [2018-01-21 05:48:24,503 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 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 05:48:24,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-01-21 05:48:24,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2018-01-21 05:48:24,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 05:48:24,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 99 transitions. [2018-01-21 05:48:24,508 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 99 transitions. Word has length 22 [2018-01-21 05:48:24,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:48:24,509 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 99 transitions. [2018-01-21 05:48:24,509 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 05:48:24,509 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 99 transitions. [2018-01-21 05:48:24,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 05:48:24,510 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:48:24,510 INFO L322 BasicCegarLoop]: trace histogram [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] [2018-01-21 05:48:24,510 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 05:48:24,510 INFO L82 PathProgramCache]: Analyzing trace with hash -2138226282, now seen corresponding path program 1 times [2018-01-21 05:48:24,510 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:48:24,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,511 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:48:24,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:48:24,511 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:48:24,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:48:24,534 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:48:25,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 05:48:25,402 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:48:25,402 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:48:25,403 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 05:48:25,405 INFO L201 CegarAbsIntRunner]: [0], [1], [7], [8], [9], [10], [11], [15], [17], [20], [109], [110], [111], [112], [113], [117], [121], [123], [124], [125], [126], [127], [128], [129], [140], [142], [153], [155], [159], [161], [162], [163], [164] [2018-01-21 05:48:25,473 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 05:48:25,473 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