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/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:47:59,297 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:47:59,300 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:47:59,318 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:47:59,318 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:47:59,319 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:47:59,320 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:47:59,322 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:47:59,325 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:47:59,326 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:47:59,327 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:47:59,327 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:47:59,328 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:47:59,329 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:47:59,330 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:47:59,333 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:47:59,335 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:47:59,337 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:47:59,339 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:47:59,340 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:47:59,342 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:47:59,347 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:47:59,348 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:47:59,348 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 08:47:59,359 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:47:59,359 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:47:59,360 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:47:59,360 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:47:59,360 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:47:59,360 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:47:59,361 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:47:59,361 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:47:59,361 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:47:59,362 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:47:59,362 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:47:59,362 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:47:59,362 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:47:59,362 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:47:59,363 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:47:59,363 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:47:59,363 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:47:59,363 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:47:59,363 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:47:59,363 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:47:59,364 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:47:59,364 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:47:59,364 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:47:59,364 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:47:59,364 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:47:59,365 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:47:59,365 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:47:59,365 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:47:59,365 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:47:59,365 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:47:59,366 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:47:59,366 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:47:59,366 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:47:59,366 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:47:59,366 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:47:59,367 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:47:59,367 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:47:59,367 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:47:59,368 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:47:59,368 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:47:59,403 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:47:59,415 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:47:59,419 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:47:59,420 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:47:59,421 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:47:59,421 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 08:47:59,547 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:47:59,552 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:47:59,553 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:47:59,553 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:47:59,561 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:47:59,562 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,565 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60aa16d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59, skipping insertion in model container [2018-01-21 08:47:59,566 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,586 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:47:59,605 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:47:59,744 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:47:59,766 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:47:59,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59 WrapperNode [2018-01-21 08:47:59,772 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:47:59,773 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:47:59,773 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:47:59,773 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:47:59,784 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,785 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,792 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,793 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,796 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,800 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,801 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (1/1) ... [2018-01-21 08:47:59,802 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:47:59,803 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:47:59,803 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:47:59,803 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:47:59,804 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (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 08:47:59,853 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:47:59,853 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:47:59,853 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:47:59,853 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:47:59,853 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:47:59,853 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:47:59,853 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:47:59,853 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:47:59,853 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:47:59,854 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:47:59,854 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:47:59,854 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:47:59,854 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:48:00,032 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:48:00,032 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:48:00 BoogieIcfgContainer [2018-01-21 08:48:00,032 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:48:00,033 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:48:00,033 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:48:00,035 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:48:00,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:47:59" (1/3) ... [2018-01-21 08:48:00,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a6cf941 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:48:00, skipping insertion in model container [2018-01-21 08:48:00,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:47:59" (2/3) ... [2018-01-21 08:48:00,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a6cf941 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:48:00, skipping insertion in model container [2018-01-21 08:48:00,037 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:48:00" (3/3) ... [2018-01-21 08:48:00,038 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 08:48:00,045 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:48:00,052 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:48:00,104 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:00,105 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:00,105 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:00,105 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:00,105 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:00,105 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:00,105 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:00,105 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:48:00,106 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:00,128 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:48:00,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:48:00,134 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:00,136 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:48:00,136 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:48:00,142 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 08:48:00,144 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:00,204 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,204 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:00,204 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,204 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:00,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:48:00,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:48:00,271 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:48:00,278 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:48:00,285 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:00,285 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:00,285 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:00,285 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:00,285 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:00,285 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:00,285 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:00,285 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:48:00,285 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:00,287 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:48:00,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:48:00,289 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:00,289 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:00,289 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:48:00,289 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 08:48:00,290 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:00,291 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,291 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:00,292 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,292 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:00,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:00,321 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:00,353 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 08:48:00,354 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:00,355 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:48:00,355 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:00,357 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:48:00,367 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:48:00,368 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:00,371 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:48:00,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:00,401 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:48:00,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:48:00,403 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:48:00,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:00,412 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:48:00,412 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:48:00,416 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 08:48:00,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:48:00,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:48:00,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:48:00,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:48:00,506 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:48:00,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:00,507 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:48:00,507 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:48:00,507 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:48:00,507 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:48:00,509 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:00,510 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:00,510 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:00,510 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:00,510 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:00,510 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:00,510 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:00,510 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:48:00,510 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:00,512 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:48:00,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:48:00,513 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:00,513 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:00,513 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:00,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 08:48:00,513 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:00,514 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,514 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:00,514 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,515 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:00,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:00,522 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:00,536 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 08:48:00,536 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:00,537 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:48:00,537 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:00,537 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:48:00,537 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:48:00,538 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:00,538 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:48:00,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:00,542 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:48:00,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:48:00,542 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:48:00,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:00,544 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:48:00,544 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 08:48:00,545 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 08:48:00,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 08:48:00,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 08:48:00,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 08:48:00,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 08:48:00,556 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 08:48:00,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:00,557 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 08:48:00,557 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:48:00,557 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 08:48:00,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:48:00,558 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:00,558 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 08:48:00,558 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:00,558 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 08:48:00,558 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:00,559 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,559 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:00,559 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,559 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:00,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:00,571 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:00,609 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 08:48:00,609 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:00,610 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:48:00,610 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:00,612 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:48:00,612 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:48:00,612 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:48:00,612 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 08:48:00,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:00,681 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 08:48:00,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:48:00,681 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:48:00,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:00,685 INFO L225 Difference]: With dead ends: 66 [2018-01-21 08:48:00,686 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:48:00,687 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:48:00,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:48:00,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 08:48:00,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 08:48:00,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 08:48:00,698 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 08:48:00,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:00,698 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 08:48:00,699 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:48:00,699 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 08:48:00,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 08:48:00,700 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:00,700 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] [2018-01-21 08:48:00,700 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:00,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 08:48:00,701 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:00,702 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,702 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:00,702 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,702 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:00,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:00,721 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:00,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:00,879 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:00,879 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 08:48:00,879 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:00,880 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:48:00,880 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:48:00,880 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:48:00,880 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 08:48:00,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:00,959 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 08:48:00,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:48:00,959 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 08:48:00,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:00,961 INFO L225 Difference]: With dead ends: 80 [2018-01-21 08:48:00,961 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 08:48:00,962 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-01-21 08:48:00,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 08:48:00,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 08:48:00,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 08:48:00,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 08:48:00,968 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 08:48:00,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:00,968 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 08:48:00,968 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:48:00,969 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 08:48:00,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 08:48:00,969 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:00,970 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:00,970 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:00,970 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 08:48:00,970 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:00,971 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,971 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:00,971 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:00,971 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:00,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:00,986 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:01,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:01,081 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:01,082 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:01,083 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 08:48:01,085 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:48:01,137 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:48:01,137 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:48:04,348 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:48:04,350 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 08:48:04,362 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:48:04,362 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:04,362 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:04,378 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:04,378 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:04,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:04,408 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:04,541 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:04,541 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:04,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:04,756 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:04,756 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:04,763 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:04,763 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:04,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:04,800 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:04,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:48:04,833 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:04,888 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:48:04,891 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:04,891 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-21 08:48:04,891 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:04,892 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 08:48:04,892 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 08:48:04,892 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:48:04,892 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 08:48:05,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:05,038 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-21 08:48:05,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:48:05,039 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 08:48:05,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:05,040 INFO L225 Difference]: With dead ends: 87 [2018-01-21 08:48:05,040 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:48:05,041 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:48:05,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:48:05,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-21 08:48:05,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 08:48:05,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 08:48:05,047 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 08:48:05,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:05,048 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 08:48:05,048 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 08:48:05,048 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 08:48:05,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 08:48:05,049 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:05,049 INFO L322 BasicCegarLoop]: trace histogram [3, 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] [2018-01-21 08:48:05,049 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:05,050 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 08:48:05,050 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:05,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:05,051 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:05,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:05,051 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:05,067 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:05,190 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:05,190 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,190 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:05,190 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:05,191 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:05,191 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,191 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:05,196 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:05,197 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:05,209 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,215 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,217 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:05,219 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:05,289 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:05,289 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:05,389 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:05,409 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,409 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:05,412 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:05,412 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:05,423 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,435 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:05,445 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:05,449 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:05,482 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:48:05,483 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:05,529 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:48:05,531 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:05,531 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-21 08:48:05,532 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:05,532 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:48:05,532 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:48:05,534 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:48:05,534 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-21 08:48:05,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:05,665 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-21 08:48:05,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:48:05,665 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-21 08:48:05,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:05,667 INFO L225 Difference]: With dead ends: 97 [2018-01-21 08:48:05,667 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 08:48:05,668 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:48:05,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 08:48:05,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-21 08:48:05,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 08:48:05,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-21 08:48:05,674 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-21 08:48:05,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:05,674 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-21 08:48:05,675 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:48:05,675 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-21 08:48:05,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 08:48:05,676 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:05,676 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 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] [2018-01-21 08:48:05,676 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:05,677 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-21 08:48:05,677 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:05,678 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:05,678 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:05,678 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:05,678 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:05,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:05,693 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:05,964 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:05,964 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,964 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:05,964 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:05,965 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:05,965 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:05,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:05,973 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:05,973 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:05,981 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:05,991 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:05,996 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:05,998 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:06,024 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 08:48:06,024 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:06,071 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 08:48:06,103 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,103 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:06,107 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:06,107 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:06,121 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:06,130 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:06,139 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:06,142 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:06,147 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 08:48:06,148 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:06,167 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 08:48:06,168 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:06,168 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-21 08:48:06,168 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:06,169 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 08:48:06,169 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 08:48:06,169 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:48:06,169 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-21 08:48:06,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:06,286 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-21 08:48:06,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 08:48:06,286 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-21 08:48:06,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:06,288 INFO L225 Difference]: With dead ends: 131 [2018-01-21 08:48:06,288 INFO L226 Difference]: Without dead ends: 85 [2018-01-21 08:48:06,289 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:48:06,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-21 08:48:06,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-21 08:48:06,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 08:48:06,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-21 08:48:06,298 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-21 08:48:06,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:06,298 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-21 08:48:06,298 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 08:48:06,299 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-21 08:48:06,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 08:48:06,301 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:06,301 INFO L322 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 3, 2, 2, 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] [2018-01-21 08:48:06,302 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:06,302 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-21 08:48:06,302 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:06,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:06,303 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:06,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:06,303 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:06,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:06,325 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:06,546 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 08:48:06,546 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,546 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:06,546 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:06,547 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:06,547 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,547 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:06,559 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:06,559 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:06,584 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:06,587 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:06,673 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 08:48:06,673 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:06,864 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 08:48:06,884 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:06,885 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:06,889 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:06,890 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:06,947 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:06,953 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:06,967 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 08:48:06,968 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:07,021 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 08:48:07,023 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:07,023 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 08:48:07,023 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:07,024 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 08:48:07,024 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 08:48:07,024 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:48:07,025 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-21 08:48:07,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:07,180 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-21 08:48:07,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 08:48:07,180 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-21 08:48:07,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:07,181 INFO L225 Difference]: With dead ends: 134 [2018-01-21 08:48:07,181 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 08:48:07,182 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-21 08:48:07,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 08:48:07,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-21 08:48:07,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 08:48:07,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-21 08:48:07,189 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-21 08:48:07,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:07,190 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-21 08:48:07,190 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 08:48:07,190 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-21 08:48:07,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-21 08:48:07,192 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:07,193 INFO L322 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 3, 2, 2, 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] [2018-01-21 08:48:07,193 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:07,193 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-21 08:48:07,193 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:07,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:07,194 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:07,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:07,194 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:07,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:07,213 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:07,379 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 08:48:07,379 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:07,379 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:07,379 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:07,380 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:07,380 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:07,380 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:07,390 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:07,390 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:07,399 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,401 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,404 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,407 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,423 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,424 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:07,428 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:07,591 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 08:48:07,591 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:07,753 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 08:48:07,775 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:07,775 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:07,778 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:07,778 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:07,786 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,789 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,796 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,805 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,816 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,834 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:07,843 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:07,847 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:07,859 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 08:48:07,859 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:07,948 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 08:48:07,951 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:07,951 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 08:48:07,951 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:07,952 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 08:48:07,952 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 08:48:07,952 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-21 08:48:07,953 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-21 08:48:08,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:08,178 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-21 08:48:08,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 08:48:08,178 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-21 08:48:08,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:08,179 INFO L225 Difference]: With dead ends: 144 [2018-01-21 08:48:08,179 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 08:48:08,180 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=268, Invalid=602, Unknown=0, NotChecked=0, Total=870 [2018-01-21 08:48:08,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 08:48:08,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-21 08:48:08,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 08:48:08,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-21 08:48:08,185 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-21 08:48:08,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:08,186 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-21 08:48:08,186 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 08:48:08,186 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-21 08:48:08,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-21 08:48:08,187 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:08,187 INFO L322 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 3, 2, 2, 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] [2018-01-21 08:48:08,187 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:08,187 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-21 08:48:08,187 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:08,188 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:08,188 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:08,188 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:08,188 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:08,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:08,206 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:08,416 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 5 proven. 296 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-01-21 08:48:08,417 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:08,417 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:08,417 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:08,417 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:08,417 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:08,417 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:08,422 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:08,422 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:08,430 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,432 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,435 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,438 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,444 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,445 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:08,447 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:08,471 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 08:48:08,471 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:08,512 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 08:48:08,532 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:08,532 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:08,535 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:08,535 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:08,547 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,553 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,565 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,578 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,597 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:08,607 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:08,611 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:08,622 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 08:48:08,622 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:08,652 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 08:48:08,653 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:08,653 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-21 08:48:08,653 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:08,654 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 08:48:08,654 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 08:48:08,654 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-21 08:48:08,654 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-21 08:48:08,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:08,773 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-21 08:48:08,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 08:48:08,774 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-21 08:48:08,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:08,775 INFO L225 Difference]: With dead ends: 183 [2018-01-21 08:48:08,775 INFO L226 Difference]: Without dead ends: 114 [2018-01-21 08:48:08,775 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:48:08,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-21 08:48:08,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-21 08:48:08,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 08:48:08,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-21 08:48:08,782 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-21 08:48:08,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:08,782 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-21 08:48:08,782 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 08:48:08,782 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-21 08:48:08,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-21 08:48:08,784 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:08,784 INFO L322 BasicCegarLoop]: trace histogram [24, 21, 21, 21, 21, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:08,784 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:08,784 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-21 08:48:08,784 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:08,785 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:08,785 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:08,785 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:08,785 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:08,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:08,809 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:09,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 08:48:09,075 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:09,075 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:09,076 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:09,076 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:09,076 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:09,076 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:09,081 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:09,081 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:09,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:09,119 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:09,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 08:48:09,259 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:09,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 08:48:09,515 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:09,516 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:09,519 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:09,519 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:09,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:09,581 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:09,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 08:48:09,608 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:09,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 08:48:09,718 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:09,718 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 08:48:09,718 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:09,719 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 08:48:09,719 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 08:48:09,720 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-21 08:48:09,720 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-21 08:48:09,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:09,961 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-21 08:48:09,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 08:48:09,962 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-21 08:48:09,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:09,963 INFO L225 Difference]: With dead ends: 182 [2018-01-21 08:48:09,963 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 08:48:09,964 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 612 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=432, Invalid=974, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:48:09,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 08:48:09,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-21 08:48:09,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 08:48:09,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-21 08:48:09,972 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-21 08:48:09,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:09,973 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-21 08:48:09,973 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 08:48:09,973 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-21 08:48:09,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 08:48:09,975 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:09,976 INFO L322 BasicCegarLoop]: trace histogram [27, 24, 24, 24, 24, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:09,976 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:09,976 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-21 08:48:09,976 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:09,977 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:09,977 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:09,977 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:09,977 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:10,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:10,001 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:10,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 08:48:10,288 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:10,288 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:10,288 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:10,288 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:10,288 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:10,288 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:10,293 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:10,293 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:10,306 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:10,325 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:10,337 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:10,342 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:10,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 08:48:10,478 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 08:48:10,761 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:10,761 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:10,764 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:10,764 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:10,781 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:10,811 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:10,836 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:10,843 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:10,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 08:48:10,865 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:10,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 08:48:10,982 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:10,982 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 08:48:10,982 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:10,983 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 08:48:10,983 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 08:48:10,983 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-21 08:48:10,983 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-21 08:48:11,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:11,257 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-21 08:48:11,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 08:48:11,258 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-21 08:48:11,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:11,259 INFO L225 Difference]: With dead ends: 192 [2018-01-21 08:48:11,259 INFO L226 Difference]: Without dead ends: 104 [2018-01-21 08:48:11,259 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 08:48:11,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-21 08:48:11,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-21 08:48:11,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 08:48:11,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-21 08:48:11,267 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-21 08:48:11,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:11,267 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-21 08:48:11,268 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 08:48:11,268 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-21 08:48:11,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-21 08:48:11,271 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:11,271 INFO L322 BasicCegarLoop]: trace histogram [30, 27, 27, 27, 27, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:11,272 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:11,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-21 08:48:11,272 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:11,273 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:11,273 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:11,273 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:11,273 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:11,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:11,299 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:11,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 8 proven. 1090 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2018-01-21 08:48:11,656 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:11,656 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:11,656 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:11,656 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:11,656 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:11,657 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:11,662 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:11,662 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:11,679 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,695 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,710 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,716 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,718 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:11,724 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:11,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 08:48:11,823 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:11,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 08:48:11,917 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:11,918 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:11,929 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:11,929 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:11,950 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,959 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,973 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:11,995 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:12,007 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:12,012 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:12,029 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 08:48:12,029 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:12,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 08:48:12,086 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:12,086 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-21 08:48:12,086 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:12,087 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 08:48:12,087 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 08:48:12,087 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-21 08:48:12,087 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-21 08:48:12,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:12,244 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-21 08:48:12,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:48:12,245 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-21 08:48:12,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:12,246 INFO L225 Difference]: With dead ends: 236 [2018-01-21 08:48:12,246 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 08:48:12,247 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:48:12,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 08:48:12,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-21 08:48:12,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 08:48:12,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-21 08:48:12,254 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-21 08:48:12,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:12,254 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-21 08:48:12,254 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 08:48:12,255 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-21 08:48:12,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-21 08:48:12,257 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:12,257 INFO L322 BasicCegarLoop]: trace histogram [44, 40, 40, 40, 40, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:12,257 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:12,257 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-21 08:48:12,257 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:12,258 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:12,258 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:12,258 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:12,258 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:12,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:12,279 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:12,679 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 08:48:12,679 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:12,679 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:12,679 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:12,679 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:12,679 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:12,679 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:12,684 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:12,685 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:12,734 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:12,738 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:12,952 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 08:48:12,952 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:13,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 08:48:13,375 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:13,375 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:13,377 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:48:13,378 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:48:13,717 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:13,728 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:13,790 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 08:48:13,791 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:13,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 08:48:13,985 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:13,985 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 08:48:13,985 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:13,986 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 08:48:13,986 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 08:48:13,986 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:48:13,986 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-21 08:48:14,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:14,362 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-21 08:48:14,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:48:14,363 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-21 08:48:14,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:14,365 INFO L225 Difference]: With dead ends: 230 [2018-01-21 08:48:14,365 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 08:48:14,367 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1030 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=753, Invalid=1697, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 08:48:14,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 08:48:14,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-21 08:48:14,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-21 08:48:14,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-21 08:48:14,376 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-21 08:48:14,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:14,376 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-21 08:48:14,376 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 08:48:14,377 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-21 08:48:14,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-21 08:48:14,379 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:14,379 INFO L322 BasicCegarLoop]: trace histogram [48, 44, 44, 44, 44, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:14,379 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:14,379 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-21 08:48:14,379 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:14,380 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:14,380 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:14,381 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:14,381 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:14,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:14,412 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:14,888 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 08:48:14,888 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:14,888 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:14,889 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:14,889 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:14,889 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:14,889 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:14,895 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:14,895 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:14,910 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,912 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,914 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,916 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,920 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,923 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,927 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,932 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,937 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,943 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,950 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,960 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,972 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:14,973 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:14,979 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:15,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 08:48:15,263 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:15,669 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 08:48:15,690 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:15,690 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:15,693 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:48:15,694 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:15,715 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,719 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,727 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,740 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,761 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,791 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,840 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,890 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:15,970 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:16,103 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:16,280 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:16,528 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:16,839 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:16,890 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:16,900 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:16,971 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 08:48:16,971 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:17,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 08:48:17,154 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:17,155 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 08:48:17,155 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:17,155 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 08:48:17,156 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 08:48:17,156 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 08:48:17,156 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-21 08:48:17,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:17,566 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-21 08:48:17,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 08:48:17,566 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-21 08:48:17,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:17,567 INFO L225 Difference]: With dead ends: 240 [2018-01-21 08:48:17,567 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 08:48:17,568 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 08:48:17,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 08:48:17,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-21 08:48:17,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-21 08:48:17,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-21 08:48:17,574 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-21 08:48:17,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:17,575 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-21 08:48:17,575 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 08:48:17,575 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-21 08:48:17,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-21 08:48:17,577 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:17,577 INFO L322 BasicCegarLoop]: trace histogram [52, 48, 48, 48, 48, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:17,577 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:17,577 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-21 08:48:17,577 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:17,578 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:17,578 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:17,579 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:17,579 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:17,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:17,611 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:18,154 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 11 proven. 2673 refuted. 0 times theorem prover too weak. 3414 trivial. 0 not checked. [2018-01-21 08:48:18,154 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:18,154 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:18,154 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:18,155 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:18,155 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:18,155 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:18,162 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:18,162 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:18,185 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,187 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,192 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,194 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,198 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,207 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,218 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,224 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,255 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,257 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:18,260 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:18,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 08:48:18,330 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:18,433 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 08:48:18,465 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:18,465 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:18,468 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:48:18,468 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:48:18,501 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,510 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,528 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,546 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,566 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,594 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,633 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:18,718 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:19,002 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:48:19,028 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:19,034 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:19,080 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 08:48:19,080 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:19,181 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 08:48:19,183 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:19,183 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-21 08:48:19,183 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:19,184 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 08:48:19,184 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 08:48:19,184 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-21 08:48:19,184 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-21 08:48:19,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:19,349 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-21 08:48:19,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:48:19,349 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-21 08:48:19,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:19,350 INFO L225 Difference]: With dead ends: 289 [2018-01-21 08:48:19,350 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 08:48:19,351 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:48:19,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 08:48:19,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-21 08:48:19,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-21 08:48:19,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-21 08:48:19,358 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-21 08:48:19,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:19,358 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-21 08:48:19,358 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 08:48:19,358 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-21 08:48:19,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-21 08:48:19,360 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:19,360 INFO L322 BasicCegarLoop]: trace histogram [70, 65, 65, 65, 65, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:19,360 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:19,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-21 08:48:19,361 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:19,361 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:19,361 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:19,362 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:19,362 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:19,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:19,392 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:19,900 WARN L146 SmtUtils]: Spent 106ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 08:48:20,245 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 08:48:20,246 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:20,246 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:20,246 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:20,246 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:20,246 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:20,246 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:20,251 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:20,252 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:20,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:20,322 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:20,642 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 08:48:20,642 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:21,330 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 08:48:21,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:21,352 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:21,355 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:21,355 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:21,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:21,527 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:21,602 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 08:48:21,603 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:21,846 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 08:48:21,847 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:21,848 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 08:48:21,848 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:21,848 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 08:48:21,848 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 08:48:21,849 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 08:48:21,849 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-21 08:48:22,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:22,294 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-21 08:48:22,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:48:22,295 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-21 08:48:22,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:22,297 INFO L225 Difference]: With dead ends: 278 [2018-01-21 08:48:22,297 INFO L226 Difference]: Without dead ends: 147 [2018-01-21 08:48:22,299 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 08:48:22,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-21 08:48:22,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-21 08:48:22,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-21 08:48:22,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-21 08:48:22,308 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-21 08:48:22,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:22,309 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-21 08:48:22,309 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 08:48:22,309 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-21 08:48:22,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 08:48:22,312 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:22,312 INFO L322 BasicCegarLoop]: trace histogram [75, 70, 70, 70, 70, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:22,312 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:22,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-21 08:48:22,312 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:22,313 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:22,313 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:22,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:22,314 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:22,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:22,350 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:23,098 WARN L146 SmtUtils]: Spent 119ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 08:48:23,393 WARN L146 SmtUtils]: Spent 110ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 08:48:23,568 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 08:48:23,568 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:23,568 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:23,568 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:23,568 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:23,568 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:23,568 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:23,575 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:23,575 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:23,599 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:23,641 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:23,653 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:23,659 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:24,124 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 08:48:24,124 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:25,370 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 08:48:25,401 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:25,401 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:25,415 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:48:25,415 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:48:25,446 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:25,528 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:48:25,588 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:25,602 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:25,682 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 08:48:25,682 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:25,883 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 08:48:25,884 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:48:25,885 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 08:48:25,885 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:48:25,885 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 08:48:25,886 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 08:48:25,886 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 08:48:25,887 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-21 08:48:26,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:26,381 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-21 08:48:26,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 08:48:26,381 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-21 08:48:26,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:26,382 INFO L225 Difference]: With dead ends: 288 [2018-01-21 08:48:26,382 INFO L226 Difference]: Without dead ends: 152 [2018-01-21 08:48:26,384 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 08:48:26,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-21 08:48:26,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-21 08:48:26,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-21 08:48:26,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-21 08:48:26,389 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-21 08:48:26,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:26,389 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-21 08:48:26,389 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 08:48:26,389 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-21 08:48:26,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-21 08:48:26,391 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:26,391 INFO L322 BasicCegarLoop]: trace histogram [80, 75, 75, 75, 75, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:26,392 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:26,392 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-21 08:48:26,392 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:26,392 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:26,392 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:48:26,393 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:26,393 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:26,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:26,418 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:27,170 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 14 proven. 5315 refuted. 0 times theorem prover too weak. 9416 trivial. 0 not checked. [2018-01-21 08:48:27,170 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:27,170 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:27,170 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:48:27,170 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:48:27,170 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:27,170 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:27,175 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:27,175 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:27,196 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,198 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,201 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,205 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,210 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,214 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,218 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,222 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,228 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,235 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,242 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,249 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,257 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,265 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,274 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,288 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,297 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:27,299 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:48:27,304 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:27,745 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 08:48:27,745 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:28,539 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 08:48:28,559 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:28,572 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:48:28,575 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:48:28,575 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:48:28,609 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:28,617 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:28,631 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:28,651 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:28,689 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:28,760 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:28,878 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:29,056 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:29,335 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:30,058 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:30,705 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:31,651 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:48:43,688 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown