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_mostprecise.epf -i ../../../trunk/examples/svcomp/memsafety-ext/tree_stack_true-valid-memsafety_false-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:05:28,570 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:05:28,572 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:05:28,587 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:05:28,587 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:05:28,588 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:05:28,590 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:05:28,591 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:05:28,593 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:05:28,594 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:05:28,594 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:05:28,594 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:05:28,595 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:05:28,596 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:05:28,597 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:05:28,599 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:05:28,602 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:05:28,604 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:05:28,605 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:05:28,607 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:05:28,609 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 03:05:28,616 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_mostprecise.epf [2018-01-21 03:05:28,626 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:05:28,626 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:05:28,627 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:05:28,627 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:05:28,628 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:05:28,628 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:05:28,628 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:05:28,628 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:05:28,628 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:05:28,629 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:05:28,629 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:05:28,629 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:05:28,630 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:05:28,630 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:05:28,630 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:05:28,630 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:05:28,630 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:05:28,631 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:05:28,631 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:05:28,631 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:05:28,631 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:05:28,631 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:05:28,632 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:05:28,632 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:05:28,632 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:05:28,632 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:05:28,633 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:05:28,633 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:05:28,633 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:05:28,633 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:05:28,633 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:05:28,633 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:05:28,634 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:05:28,634 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:05:28,634 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:05:28,634 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:05:28,634 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:05:28,635 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:05:28,636 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:05:28,636 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:05:28,671 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:05:28,687 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:05:28,691 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:05:28,692 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:05:28,692 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:05:28,693 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety-ext/tree_stack_true-valid-memsafety_false-termination.i [2018-01-21 03:05:28,942 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:05:28,946 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:05:28,947 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:05:28,948 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:05:28,955 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:05:28,997 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:05:28" (1/1) ... [2018-01-21 03:05:29,000 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 03:05:28, skipping insertion in model container [2018-01-21 03:05:29,001 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:05:28" (1/1) ... [2018-01-21 03:05:29,021 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:05:29,081 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:05:29,234 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:05:29,260 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:05:29,267 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29 WrapperNode [2018-01-21 03:05:29,268 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:05:29,268 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:05:29,269 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:05:29,269 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:05:29,280 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,280 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,290 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,290 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,297 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,302 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,303 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (1/1) ... [2018-01-21 03:05:29,306 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:05:29,306 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:05:29,306 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:05:29,306 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:05:29,307 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (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 03:05:29,374 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:05:29,374 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:05:29,375 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-21 03:05:29,375 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 03:05:29,376 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 03:05:29,376 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:05:29,376 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:05:29,376 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:05:29,763 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:05:29,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:05:29 BoogieIcfgContainer [2018-01-21 03:05:29,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:05:29,765 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:05:29,765 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:05:29,767 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:05:29,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:05:28" (1/3) ... [2018-01-21 03:05:29,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6faff05d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:05:29, skipping insertion in model container [2018-01-21 03:05:29,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:05:29" (2/3) ... [2018-01-21 03:05:29,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6faff05d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:05:29, skipping insertion in model container [2018-01-21 03:05:29,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:05:29" (3/3) ... [2018-01-21 03:05:29,770 INFO L105 eAbstractionObserver]: Analyzing ICFG tree_stack_true-valid-memsafety_false-termination.i [2018-01-21 03:05:29,778 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:05:29,786 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 03:05:29,847 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:05:29,847 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:05:29,847 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:05:29,848 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:05:29,848 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:05:29,848 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:05:29,848 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:05:29,848 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:05:29,849 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:05:29,871 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2018-01-21 03:05:29,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:05:29,877 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:29,878 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:05:29,878 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:05:29,882 INFO L82 PathProgramCache]: Analyzing trace with hash 178748, now seen corresponding path program 1 times [2018-01-21 03:05:29,884 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:29,927 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:29,928 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:29,928 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:29,928 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:29,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:05:29,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:05:29,990 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:05:29,997 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:05:30,004 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:05:30,004 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:05:30,004 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:05:30,004 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:05:30,004 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:05:30,004 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:05:30,005 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:05:30,005 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:05:30,005 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:05:30,007 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2018-01-21 03:05:30,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 03:05:30,009 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:30,010 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:05:30,010 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:05:30,010 INFO L82 PathProgramCache]: Analyzing trace with hash -1961960643, now seen corresponding path program 1 times [2018-01-21 03:05:30,010 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:30,011 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,011 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:30,011 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,011 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:30,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:05:30,039 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:05:30,075 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 03:05:30,077 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:05:30,078 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:05:30,078 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:05:30,082 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:05:30,098 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:05:30,099 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:05:30,102 INFO L87 Difference]: Start difference. First operand 85 states. Second operand 2 states. [2018-01-21 03:05:30,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:05:30,218 INFO L93 Difference]: Finished difference Result 160 states and 186 transitions. [2018-01-21 03:05:30,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:05:30,220 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-21 03:05:30,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:05:30,234 INFO L225 Difference]: With dead ends: 160 [2018-01-21 03:05:30,234 INFO L226 Difference]: Without dead ends: 82 [2018-01-21 03:05:30,238 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 03:05:30,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-01-21 03:05:30,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-01-21 03:05:30,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-01-21 03:05:30,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2018-01-21 03:05:30,279 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 20 [2018-01-21 03:05:30,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:05:30,279 INFO L432 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2018-01-21 03:05:30,280 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:05:30,280 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2018-01-21 03:05:30,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 03:05:30,281 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:30,281 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] [2018-01-21 03:05:30,281 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:05:30,282 INFO L82 PathProgramCache]: Analyzing trace with hash -2069207582, now seen corresponding path program 1 times [2018-01-21 03:05:30,282 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:30,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,283 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:30,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,283 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:30,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:05:30,310 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:05:30,386 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 03:05:30,387 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:05:30,387 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 03:05:30,387 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:05:30,389 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 03:05:30,390 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 03:05:30,390 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 03:05:30,390 INFO L87 Difference]: Start difference. First operand 82 states and 92 transitions. Second operand 4 states. [2018-01-21 03:05:30,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:05:30,456 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2018-01-21 03:05:30,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:05:30,456 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2018-01-21 03:05:30,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:05:30,458 INFO L225 Difference]: With dead ends: 91 [2018-01-21 03:05:30,458 INFO L226 Difference]: Without dead ends: 86 [2018-01-21 03:05:30,460 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 03:05:30,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-01-21 03:05:30,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2018-01-21 03:05:30,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-01-21 03:05:30,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 94 transitions. [2018-01-21 03:05:30,469 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 94 transitions. Word has length 23 [2018-01-21 03:05:30,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:05:30,469 INFO L432 AbstractCegarLoop]: Abstraction has 84 states and 94 transitions. [2018-01-21 03:05:30,470 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 03:05:30,470 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 94 transitions. [2018-01-21 03:05:30,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 03:05:30,471 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:30,471 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] [2018-01-21 03:05:30,472 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:05:30,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1378605137, now seen corresponding path program 1 times [2018-01-21 03:05:30,472 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:30,473 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,473 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:30,473 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,474 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:30,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:05:30,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:05:30,554 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:05:30,562 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:05:30,567 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:05:30,567 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:05:30,579 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:05:30,580 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:05:30,580 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:05:30,580 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:05:30,580 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:05:30,580 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:05:30,580 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:05:30,580 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 03:05:30,580 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:05:30,582 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2018-01-21 03:05:30,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 03:05:30,582 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:30,583 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:05:30,583 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr0EnsuresViolation]=== [2018-01-21 03:05:30,583 INFO L82 PathProgramCache]: Analyzing trace with hash -757348010, now seen corresponding path program 1 times [2018-01-21 03:05:30,583 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:30,584 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,584 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:30,584 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,584 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:30,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:05:30,598 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:05:30,611 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 03:05:30,611 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:05:30,611 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:05:30,611 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:05:30,612 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:05:30,612 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:05:30,612 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:05:30,612 INFO L87 Difference]: Start difference. First operand 85 states. Second operand 2 states. [2018-01-21 03:05:30,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:05:30,623 INFO L93 Difference]: Finished difference Result 160 states and 186 transitions. [2018-01-21 03:05:30,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:05:30,623 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2018-01-21 03:05:30,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:05:30,624 INFO L225 Difference]: With dead ends: 160 [2018-01-21 03:05:30,624 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 03:05:30,625 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 03:05:30,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 03:05:30,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2018-01-21 03:05:30,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-01-21 03:05:30,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 90 transitions. [2018-01-21 03:05:30,633 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 90 transitions. Word has length 18 [2018-01-21 03:05:30,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:05:30,633 INFO L432 AbstractCegarLoop]: Abstraction has 80 states and 90 transitions. [2018-01-21 03:05:30,633 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:05:30,633 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 90 transitions. [2018-01-21 03:05:30,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 03:05:30,634 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:30,634 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 03:05:30,634 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr0EnsuresViolation]=== [2018-01-21 03:05:30,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1655945531, now seen corresponding path program 1 times [2018-01-21 03:05:30,635 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:30,636 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,636 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:30,636 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,636 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:30,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:05:30,649 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:05:30,683 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 03:05:30,684 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:05:30,684 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 03:05:30,684 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:05:30,684 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 03:05:30,684 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 03:05:30,684 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 03:05:30,685 INFO L87 Difference]: Start difference. First operand 80 states and 90 transitions. Second operand 4 states. [2018-01-21 03:05:30,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:05:30,718 INFO L93 Difference]: Finished difference Result 87 states and 97 transitions. [2018-01-21 03:05:30,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:05:30,719 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2018-01-21 03:05:30,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:05:30,720 INFO L225 Difference]: With dead ends: 87 [2018-01-21 03:05:30,720 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 03:05:30,720 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 03:05:30,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 03:05:30,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2018-01-21 03:05:30,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-01-21 03:05:30,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 92 transitions. [2018-01-21 03:05:30,725 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 92 transitions. Word has length 21 [2018-01-21 03:05:30,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:05:30,726 INFO L432 AbstractCegarLoop]: Abstraction has 82 states and 92 transitions. [2018-01-21 03:05:30,726 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 03:05:30,726 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 92 transitions. [2018-01-21 03:05:30,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 03:05:30,727 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:05:30,727 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] [2018-01-21 03:05:30,727 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr0EnsuresViolation]=== [2018-01-21 03:05:30,727 INFO L82 PathProgramCache]: Analyzing trace with hash 990743112, now seen corresponding path program 1 times [2018-01-21 03:05:30,727 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:05:30,728 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,728 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:05:30,728 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:05:30,728 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:05:30,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:05:30,753 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:05:31,239 WARN L146 SmtUtils]: Spent 158ms on a formula simplification. DAG size of input: 26 DAG size of output 18 [2018-01-21 03:05:31,787 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 03:05:31,787 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:05:31,787 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:05:31,789 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 34 with the following transitions: [2018-01-21 03:05:31,791 INFO L201 CegarAbsIntRunner]: [0], [1], [7], [8], [9], [10], [14], [16], [19], [102], [103], [104], [105], [106], [110], [114], [116], [117], [118], [119], [120], [121], [122], [133], [135], [146], [148], [152], [154], [155], [156], [157] [2018-01-21 03:05:31,852 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:05:31,853 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