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_imprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:43:54,407 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:43:54,409 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:43:54,422 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:43:54,422 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:43:54,423 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:43:54,423 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:43:54,425 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:43:54,426 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:43:54,427 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:43:54,427 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 00:43:54,428 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 00:43:54,429 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 00:43:54,430 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 00:43:54,431 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 00:43:54,433 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 00:43:54,435 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 00:43:54,437 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 00:43:54,438 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 00:43:54,439 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 00:43:54,441 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 00:43:54,445 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 00:43:54,446 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 00:43:54,446 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_imprecise.epf [2018-01-21 00:43:54,455 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:43:54,456 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:43:54,456 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:43:54,457 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:43:54,457 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:43:54,457 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-21 00:43:54,457 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:43:54,457 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:43:54,458 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:43:54,458 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:43:54,458 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:43:54,458 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:43:54,459 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:43:54,459 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:43:54,459 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:43:54,459 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:43:54,459 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:43:54,459 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:43:54,460 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:43:54,460 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:43:54,460 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:43:54,460 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:43:54,460 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:43:54,460 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:43:54,461 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:43:54,461 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:43:54,461 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:43:54,461 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:43:54,461 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:43:54,462 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:43:54,462 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:43:54,462 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:43:54,462 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:43:54,462 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:43:54,462 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:43:54,463 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:43:54,463 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:43:54,463 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:43:54,464 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:43:54,496 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:43:54,508 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:43:54,511 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:43:54,513 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:43:54,513 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:43:54,514 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 00:43:54,625 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:43:54,629 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:43:54,630 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:43:54,630 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:43:54,635 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:43:54,635 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,638 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1975a662 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54, skipping insertion in model container [2018-01-21 00:43:54,638 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,651 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:43:54,669 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:43:54,771 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:43:54,792 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:43:54,799 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54 WrapperNode [2018-01-21 00:43:54,799 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:43:54,800 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:43:54,800 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:43:54,800 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:43:54,811 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,818 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,819 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,825 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,826 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (1/1) ... [2018-01-21 00:43:54,827 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:43:54,827 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:43:54,828 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:43:54,828 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:43:54,828 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (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 00:43:54,873 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:43:54,873 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:43:54,873 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 00:43:54,874 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:43:54,874 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:43:54,874 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:43:54,874 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:43:54,874 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:43:54,874 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:43:54,874 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 00:43:54,875 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:43:54,875 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:43:54,875 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:43:55,043 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:43:55,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:43:55 BoogieIcfgContainer [2018-01-21 00:43:55,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:43:55,044 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:43:55,044 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:43:55,046 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:43:55,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:43:54" (1/3) ... [2018-01-21 00:43:55,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e6c734f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:43:55, skipping insertion in model container [2018-01-21 00:43:55,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:54" (2/3) ... [2018-01-21 00:43:55,048 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e6c734f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:43:55, skipping insertion in model container [2018-01-21 00:43:55,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:43:55" (3/3) ... [2018-01-21 00:43:55,049 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 00:43:55,057 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:43:55,064 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 00:43:55,106 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:43:55,106 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:43:55,107 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:43:55,107 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:43:55,107 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:43:55,107 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:43:55,107 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:43:55,107 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:43:55,108 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:43:55,123 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 00:43:55,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:43:55,130 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:55,131 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:43:55,131 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:43:55,137 INFO L82 PathProgramCache]: Analyzing trace with hash 102829, now seen corresponding path program 1 times [2018-01-21 00:43:55,140 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:55,182 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,182 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:55,182 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,182 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:55,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:43:55,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:43:55,240 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:43:55,247 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:43:55,252 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:43:55,252 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:43:55,252 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:43:55,252 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:43:55,252 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:43:55,253 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:43:55,253 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:43:55,253 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 00:43:55,253 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:43:55,254 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 00:43:55,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 00:43:55,255 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:55,255 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:55,255 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 00:43:55,255 INFO L82 PathProgramCache]: Analyzing trace with hash 33657389, now seen corresponding path program 1 times [2018-01-21 00:43:55,256 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:55,256 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,257 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:55,257 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,257 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:55,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:55,282 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:55,310 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 00:43:55,312 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:55,312 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:43:55,313 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:55,314 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:43:55,325 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:43:55,326 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:43:55,328 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 00:43:55,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:55,351 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 00:43:55,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:43:55,352 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 00:43:55,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:55,358 INFO L225 Difference]: With dead ends: 76 [2018-01-21 00:43:55,359 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 00:43:55,362 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 00:43:55,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 00:43:55,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 00:43:55,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 00:43:55,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 00:43:55,459 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 00:43:55,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:55,459 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 00:43:55,459 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:43:55,459 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 00:43:55,459 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 00:43:55,462 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:43:55,462 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:43:55,463 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:43:55,463 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:43:55,463 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:43:55,463 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:43:55,463 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:43:55,463 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:43:55,463 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:43:55,465 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 00:43:55,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 00:43:55,467 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:55,467 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 00:43:55,467 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:55,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1331820257, now seen corresponding path program 1 times [2018-01-21 00:43:55,468 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:55,469 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,469 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:55,470 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,470 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:55,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:55,480 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:55,494 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 00:43:55,495 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:55,519 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:43:55,519 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:55,520 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:43:55,520 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:43:55,520 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:43:55,520 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 00:43:55,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:55,525 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 00:43:55,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:43:55,525 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 00:43:55,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:55,527 INFO L225 Difference]: With dead ends: 76 [2018-01-21 00:43:55,527 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 00:43:55,528 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 00:43:55,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 00:43:55,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 00:43:55,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 00:43:55,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-01-21 00:43:55,538 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 17 [2018-01-21 00:43:55,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:55,539 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-01-21 00:43:55,539 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:43:55,539 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-01-21 00:43:55,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 00:43:55,540 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:55,540 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 00:43:55,540 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:55,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1785977394, now seen corresponding path program 1 times [2018-01-21 00:43:55,540 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:55,541 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,541 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:55,541 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,541 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:55,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:55,555 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:55,589 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 00:43:55,589 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:55,589 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 00:43:55,589 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:55,590 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 00:43:55,591 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 00:43:55,591 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:43:55,591 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 3 states. [2018-01-21 00:43:55,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:55,632 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2018-01-21 00:43:55,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 00:43:55,633 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 00:43:55,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:55,634 INFO L225 Difference]: With dead ends: 58 [2018-01-21 00:43:55,635 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 00:43:55,635 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 00:43:55,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 00:43:55,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2018-01-21 00:43:55,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 00:43:55,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 00:43:55,647 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 19 [2018-01-21 00:43:55,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:55,647 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 00:43:55,647 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 00:43:55,647 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 00:43:55,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 00:43:55,648 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:55,648 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:55,648 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:55,648 INFO L82 PathProgramCache]: Analyzing trace with hash -751966911, now seen corresponding path program 1 times [2018-01-21 00:43:55,648 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:55,649 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,650 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:55,650 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,650 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:55,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:55,670 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:55,807 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 00:43:55,808 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:55,808 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 00:43:55,808 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:55,808 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:43:55,808 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:43:55,809 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 00:43:55,809 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 6 states. [2018-01-21 00:43:55,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:55,945 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2018-01-21 00:43:55,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 00:43:55,946 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-01-21 00:43:55,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:55,948 INFO L225 Difference]: With dead ends: 79 [2018-01-21 00:43:55,948 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 00:43:55,949 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:43:55,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 00:43:55,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-01-21 00:43:55,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 00:43:55,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2018-01-21 00:43:55,955 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2018-01-21 00:43:55,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:55,955 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2018-01-21 00:43:55,955 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:43:55,956 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2018-01-21 00:43:55,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 00:43:55,958 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:55,958 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:55,958 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:55,958 INFO L82 PathProgramCache]: Analyzing trace with hash -335791331, now seen corresponding path program 1 times [2018-01-21 00:43:55,958 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:55,959 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,959 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:55,959 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:55,960 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:55,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:55,978 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:56,018 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 00:43:56,018 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:56,018 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:56,019 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 00:43:56,021 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [74], [76], [77], [78], [79], [80], [81] [2018-01-21 00:43:56,069 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:43:56,069 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:43:56,379 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:43:56,380 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 00:43:56,390 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:43:56,390 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:56,390 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 00:43:56,405 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:56,405 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:43:56,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:56,447 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:56,494 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 00:43:56,494 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:56,596 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 00:43:56,617 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:56,617 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 00:43:56,622 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:56,622 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:43:56,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:56,662 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:56,670 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 00:43:56,671 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:56,700 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 00:43:56,702 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:43:56,702 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 00:43:56,702 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:43:56,703 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:43:56,703 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:43:56,703 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:43:56,704 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 5 states. [2018-01-21 00:43:56,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:56,737 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-01-21 00:43:56,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 00:43:56,737 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 00:43:56,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:56,738 INFO L225 Difference]: With dead ends: 67 [2018-01-21 00:43:56,739 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 00:43:56,739 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:43:56,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 00:43:56,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-01-21 00:43:56,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 00:43:56,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-01-21 00:43:56,745 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-01-21 00:43:56,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:56,745 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-01-21 00:43:56,745 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:43:56,745 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-01-21 00:43:56,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 00:43:56,746 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:56,746 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 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, 1, 1, 1, 1, 1] [2018-01-21 00:43:56,747 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:56,747 INFO L82 PathProgramCache]: Analyzing trace with hash -291520001, now seen corresponding path program 2 times [2018-01-21 00:43:56,747 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:56,747 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:56,748 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:56,748 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:56,748 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:56,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:56,766 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:56,829 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 00:43:56,829 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:56,829 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:56,829 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:43:56,830 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:43:56,830 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:56,830 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 00:43:56,835 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:43:56,835 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:43:56,846 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:56,868 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:56,874 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:56,877 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 00:43:56,950 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:57,099 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 00:43:57,131 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 00:43:57,131 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 11 [2018-01-21 00:43:57,132 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:57,132 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 00:43:57,132 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 00:43:57,132 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 00:43:57,133 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2018-01-21 00:43:57,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:57,220 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 00:43:57,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:43:57,220 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 00:43:57,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:57,221 INFO L225 Difference]: With dead ends: 86 [2018-01-21 00:43:57,222 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 00:43:57,222 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-01-21 00:43:57,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 00:43:57,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2018-01-21 00:43:57,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 00:43:57,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-01-21 00:43:57,227 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 52 [2018-01-21 00:43:57,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:57,228 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-01-21 00:43:57,228 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 00:43:57,228 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-01-21 00:43:57,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 00:43:57,229 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:57,229 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 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, 1] [2018-01-21 00:43:57,229 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:57,230 INFO L82 PathProgramCache]: Analyzing trace with hash -41114337, now seen corresponding path program 3 times [2018-01-21 00:43:57,230 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:57,230 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,231 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:43:57,231 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,231 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,249 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:57,301 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 00:43:57,301 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,301 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:57,302 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:43:57,302 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:43:57,302 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,302 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:43:57,307 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:43:57,307 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:43:57,320 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:57,325 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:57,330 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:57,331 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:57,334 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:57,422 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 00:43:57,422 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:57,584 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 00:43:57,604 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,604 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 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 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:43:57,607 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:43:57,607 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:43:57,621 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:57,631 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:57,649 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:57,658 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:57,664 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:57,674 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 00:43:57,675 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:57,722 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 00:43:57,724 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:43:57,724 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 15 [2018-01-21 00:43:57,724 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:43:57,724 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 00:43:57,725 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 00:43:57,725 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-01-21 00:43:57,725 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 9 states. [2018-01-21 00:43:57,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:57,825 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2018-01-21 00:43:57,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 00:43:57,826 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 57 [2018-01-21 00:43:57,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:57,827 INFO L225 Difference]: With dead ends: 107 [2018-01-21 00:43:57,827 INFO L226 Difference]: Without dead ends: 95 [2018-01-21 00:43:57,827 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:43:57,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-01-21 00:43:57,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2018-01-21 00:43:57,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 00:43:57,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2018-01-21 00:43:57,835 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 57 [2018-01-21 00:43:57,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:57,835 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2018-01-21 00:43:57,835 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 00:43:57,835 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2018-01-21 00:43:57,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 00:43:57,837 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:57,837 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 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, 1] [2018-01-21 00:43:57,837 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:57,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1962089693, now seen corresponding path program 4 times [2018-01-21 00:43:57,838 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:57,838 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,839 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:43:57,839 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,839 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,863 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:57,967 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:43:57,967 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,967 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:57,967 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:43:57,968 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:43:57,968 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,968 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:43:57,975 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:43:57,976 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:43:58,004 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:58,008 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:58,111 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:43:58,111 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:58,301 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:43:58,323 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:58,323 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 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 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:43:58,326 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:43:58,326 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:43:58,364 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:58,370 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:58,388 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:43:58,388 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:58,500 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 00:43:58,502 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:43:58,502 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 16 [2018-01-21 00:43:58,502 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:43:58,502 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 00:43:58,503 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 00:43:58,503 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2018-01-21 00:43:58,503 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand 13 states. [2018-01-21 00:43:58,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:58,676 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2018-01-21 00:43:58,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 00:43:58,676 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-21 00:43:58,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:58,678 INFO L225 Difference]: With dead ends: 200 [2018-01-21 00:43:58,678 INFO L226 Difference]: Without dead ends: 149 [2018-01-21 00:43:58,679 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 320 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2018-01-21 00:43:58,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-01-21 00:43:58,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 106. [2018-01-21 00:43:58,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-01-21 00:43:58,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-01-21 00:43:58,695 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 85 [2018-01-21 00:43:58,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:58,695 INFO L432 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-01-21 00:43:58,695 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 00:43:58,696 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-01-21 00:43:58,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-01-21 00:43:58,698 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:58,698 INFO L322 BasicCegarLoop]: trace histogram [12, 8, 8, 8, 8, 5, 4, 4, 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, 1] [2018-01-21 00:43:58,698 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:58,699 INFO L82 PathProgramCache]: Analyzing trace with hash -1278120925, now seen corresponding path program 5 times [2018-01-21 00:43:58,699 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:58,700 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:58,700 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:43:58,700 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:58,700 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:58,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:58,728 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:58,860 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-01-21 00:43:58,860 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:58,860 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:58,860 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:43:58,860 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:43:58,860 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:58,861 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:43:58,874 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:43:58,874 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:43:58,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:58,896 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:58,914 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:58,919 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:58,924 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:59,057 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 00:43:59,058 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:59,332 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 00:43:59,352 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,353 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 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 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:43:59,356 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:43:59,356 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:43:59,369 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,379 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,405 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,414 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:59,426 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:59,440 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 00:43:59,440 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:59,627 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 00:43:59,629 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:43:59,629 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 00:43:59,629 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:43:59,629 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 00:43:59,629 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 00:43:59,630 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:43:59,630 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 14 states. [2018-01-21 00:43:59,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:59,854 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2018-01-21 00:43:59,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 00:43:59,854 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 113 [2018-01-21 00:43:59,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:59,855 INFO L225 Difference]: With dead ends: 180 [2018-01-21 00:43:59,856 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 00:43:59,857 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 434 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2018-01-21 00:43:59,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 00:43:59,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 105. [2018-01-21 00:43:59,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-01-21 00:43:59,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-01-21 00:43:59,866 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 113 [2018-01-21 00:43:59,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:59,866 INFO L432 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-01-21 00:43:59,866 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 00:43:59,866 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-01-21 00:43:59,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 00:43:59,868 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:59,868 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 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, 1] [2018-01-21 00:43:59,868 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:59,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1614733819, now seen corresponding path program 6 times [2018-01-21 00:43:59,868 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:59,869 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:59,869 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:43:59,869 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:59,869 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:59,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:59,894 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:00,016 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 00:44:00,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:00,016 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:00,016 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:00,017 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:00,017 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:00,017 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:00,022 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:00,022 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:00,034 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,038 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,041 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,043 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,047 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,056 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,061 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,067 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,073 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,074 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:00,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:00,160 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 00:44:00,160 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:00,338 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 00:44:00,359 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:00,359 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 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 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:00,362 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:00,362 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:00,377 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,386 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,400 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,423 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,456 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,496 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:00,624 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:01,152 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:02,184 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:02,227 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:02,234 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:02,259 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 00:44:02,259 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:02,352 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 00:44:02,354 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:02,354 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 8, 8] total 25 [2018-01-21 00:44:02,354 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:02,355 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 00:44:02,355 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 00:44:02,355 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2018-01-21 00:44:02,355 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 13 states. [2018-01-21 00:44:02,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:02,574 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 00:44:02,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 00:44:02,575 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 146 [2018-01-21 00:44:02,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:02,578 INFO L225 Difference]: With dead ends: 234 [2018-01-21 00:44:02,578 INFO L226 Difference]: Without dead ends: 222 [2018-01-21 00:44:02,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2018-01-21 00:44:02,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-01-21 00:44:02,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 146. [2018-01-21 00:44:02,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-21 00:44:02,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2018-01-21 00:44:02,593 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 146 [2018-01-21 00:44:02,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:02,594 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2018-01-21 00:44:02,594 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 00:44:02,594 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2018-01-21 00:44:02,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 00:44:02,597 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:02,598 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:02,598 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:02,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1755240795, now seen corresponding path program 7 times [2018-01-21 00:44:02,598 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:02,599 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:02,599 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:02,599 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:02,599 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:02,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:02,632 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:02,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 00:44:02,797 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:02,797 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:02,797 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:02,797 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:02,798 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:02,798 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:02,803 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:44:02,803 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:44:02,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:02,855 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 00:44:03,002 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:03,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 00:44:03,443 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:03,443 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 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 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:03,448 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:44:03,448 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:44:03,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:03,536 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:03,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 00:44:03,559 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:03,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 00:44:03,696 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:03,696 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13, 13, 13] total 25 [2018-01-21 00:44:03,696 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:03,697 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 00:44:03,697 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 00:44:03,697 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2018-01-21 00:44:03,697 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand 20 states. [2018-01-21 00:44:03,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:03,993 INFO L93 Difference]: Finished difference Result 370 states and 422 transitions. [2018-01-21 00:44:03,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 00:44:03,993 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 189 [2018-01-21 00:44:03,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:03,995 INFO L225 Difference]: With dead ends: 370 [2018-01-21 00:44:03,995 INFO L226 Difference]: Without dead ends: 296 [2018-01-21 00:44:03,996 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 726 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 00:44:03,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-01-21 00:44:04,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 184. [2018-01-21 00:44:04,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-21 00:44:04,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 204 transitions. [2018-01-21 00:44:04,010 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 204 transitions. Word has length 189 [2018-01-21 00:44:04,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:04,011 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 204 transitions. [2018-01-21 00:44:04,011 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 00:44:04,011 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 204 transitions. [2018-01-21 00:44:04,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-01-21 00:44:04,014 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:04,014 INFO L322 BasicCegarLoop]: trace histogram [31, 24, 24, 24, 24, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:04,015 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:04,015 INFO L82 PathProgramCache]: Analyzing trace with hash 519411977, now seen corresponding path program 8 times [2018-01-21 00:44:04,015 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:04,016 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:04,016 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:44:04,016 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:04,016 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:04,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:04,053 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:04,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1842 trivial. 0 not checked. [2018-01-21 00:44:04,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:04,245 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:04,246 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:04,246 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:04,246 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:04,246 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:04,251 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:44:04,251 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:04,268 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:04,296 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:04,300 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:04,304 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:04,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 00:44:04,393 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:04,582 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 00:44:04,602 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:04,602 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 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 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:04,605 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:44:04,605 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:04,624 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:04,669 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:04,704 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:04,712 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:04,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 00:44:04,744 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:04,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 00:44:04,961 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:04,961 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11, 11, 11] total 23 [2018-01-21 00:44:04,961 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:04,961 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 00:44:04,962 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 00:44:04,962 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2018-01-21 00:44:04,962 INFO L87 Difference]: Start difference. First operand 184 states and 204 transitions. Second operand 19 states. [2018-01-21 00:44:05,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:05,202 INFO L93 Difference]: Finished difference Result 330 states and 362 transitions. [2018-01-21 00:44:05,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 00:44:05,203 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 232 [2018-01-21 00:44:05,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:05,204 INFO L225 Difference]: With dead ends: 330 [2018-01-21 00:44:05,204 INFO L226 Difference]: Without dead ends: 248 [2018-01-21 00:44:05,205 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 903 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 00:44:05,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-01-21 00:44:05,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 183. [2018-01-21 00:44:05,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-01-21 00:44:05,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 202 transitions. [2018-01-21 00:44:05,216 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 202 transitions. Word has length 232 [2018-01-21 00:44:05,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:05,216 INFO L432 AbstractCegarLoop]: Abstraction has 183 states and 202 transitions. [2018-01-21 00:44:05,216 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 00:44:05,216 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 202 transitions. [2018-01-21 00:44:05,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 00:44:05,220 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:05,220 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:05,220 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:05,220 INFO L82 PathProgramCache]: Analyzing trace with hash -881233501, now seen corresponding path program 9 times [2018-01-21 00:44:05,220 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:05,221 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:05,221 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:05,221 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:05,222 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:05,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:05,256 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:05,545 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 00:44:05,546 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:05,563 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:05,564 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:05,564 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:05,564 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:05,564 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:05,571 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:44:05,571 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:44:05,598 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,603 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,611 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,616 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,627 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,637 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,643 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:05,644 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:05,651 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:05,795 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 00:44:05,795 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:06,095 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 00:44:06,115 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:06,115 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 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 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:06,120 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:44:06,120 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:44:06,147 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,155 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,169 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,190 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,226 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,296 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,605 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:06,630 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:06,640 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:06,699 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 00:44:06,700 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:06,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 00:44:06,960 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:06,960 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-01-21 00:44:06,960 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:06,961 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 00:44:06,961 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 00:44:06,961 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2018-01-21 00:44:06,961 INFO L87 Difference]: Start difference. First operand 183 states and 202 transitions. Second operand 18 states. [2018-01-21 00:44:07,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:07,288 INFO L93 Difference]: Finished difference Result 420 states and 476 transitions. [2018-01-21 00:44:07,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 00:44:07,288 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 275 [2018-01-21 00:44:07,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:07,292 INFO L225 Difference]: With dead ends: 420 [2018-01-21 00:44:07,292 INFO L226 Difference]: Without dead ends: 408 [2018-01-21 00:44:07,293 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1115 GetRequests, 1082 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=281, Invalid=775, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 00:44:07,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-01-21 00:44:07,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 234. [2018-01-21 00:44:07,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-01-21 00:44:07,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 264 transitions. [2018-01-21 00:44:07,310 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 264 transitions. Word has length 275 [2018-01-21 00:44:07,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:07,311 INFO L432 AbstractCegarLoop]: Abstraction has 234 states and 264 transitions. [2018-01-21 00:44:07,311 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 00:44:07,311 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 264 transitions. [2018-01-21 00:44:07,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 00:44:07,313 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:07,313 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:07,313 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:07,313 INFO L82 PathProgramCache]: Analyzing trace with hash 2119777693, now seen corresponding path program 10 times [2018-01-21 00:44:07,313 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:07,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:07,314 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:07,314 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:07,314 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:07,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:07,342 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:07,828 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 00:44:07,828 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:07,828 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:07,828 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:07,828 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:07,828 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:07,828 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:07,834 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:44:07,834 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:44:07,903 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:07,908 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:08,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 00:44:08,223 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:08,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 00:44:08,690 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:08,690 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 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 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:08,693 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:44:08,693 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:44:08,883 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:08,895 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 00:44:08,985 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:09,264 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 00:44:09,266 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:09,266 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 17, 17, 17] total 34 [2018-01-21 00:44:09,266 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:09,267 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-21 00:44:09,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-21 00:44:09,267 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=913, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 00:44:09,268 INFO L87 Difference]: Start difference. First operand 234 states and 264 transitions. Second operand 27 states. [2018-01-21 00:44:09,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:09,768 INFO L93 Difference]: Finished difference Result 592 states and 676 transitions. [2018-01-21 00:44:09,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 00:44:09,769 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 333 [2018-01-21 00:44:09,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:09,771 INFO L225 Difference]: With dead ends: 592 [2018-01-21 00:44:09,771 INFO L226 Difference]: Without dead ends: 495 [2018-01-21 00:44:09,772 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1358 GetRequests, 1292 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=445, Invalid=2005, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 00:44:09,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2018-01-21 00:44:09,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 282. [2018-01-21 00:44:09,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-01-21 00:44:09,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-01-21 00:44:09,797 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 333 [2018-01-21 00:44:09,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:09,797 INFO L432 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-01-21 00:44:09,797 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-21 00:44:09,797 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-01-21 00:44:09,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2018-01-21 00:44:09,799 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:09,799 INFO L322 BasicCegarLoop]: trace histogram [58, 48, 48, 48, 48, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:09,799 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:09,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1106394585, now seen corresponding path program 11 times [2018-01-21 00:44:09,799 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:09,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:09,800 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:09,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:09,800 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:09,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:09,841 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:10,211 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 6870 trivial. 0 not checked. [2018-01-21 00:44:10,211 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:10,211 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:10,211 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:10,211 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:10,212 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:10,212 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:10,217 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:44:10,217 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:10,243 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,246 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,252 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,259 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,266 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,276 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,284 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,286 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:10,291 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:10,501 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 00:44:10,501 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:10,909 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 00:44:10,931 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:10,931 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 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 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:10,935 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:44:10,935 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:10,960 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,969 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:10,987 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:11,023 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:11,070 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:11,597 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:11,767 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:11,803 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:11,815 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 00:44:11,911 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:12,204 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 00:44:12,207 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:12,207 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 36 [2018-01-21 00:44:12,207 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:12,208 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 00:44:12,208 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 00:44:12,209 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1062, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 00:44:12,209 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 28 states. [2018-01-21 00:44:13,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:13,048 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2018-01-21 00:44:13,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 00:44:13,048 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 391 [2018-01-21 00:44:13,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:13,052 INFO L225 Difference]: With dead ends: 640 [2018-01-21 00:44:13,053 INFO L226 Difference]: Without dead ends: 345 [2018-01-21 00:44:13,056 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1523 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=623, Invalid=3159, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 00:44:13,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-01-21 00:44:13,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 281. [2018-01-21 00:44:13,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-01-21 00:44:13,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 307 transitions. [2018-01-21 00:44:13,079 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 307 transitions. Word has length 391 [2018-01-21 00:44:13,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:13,080 INFO L432 AbstractCegarLoop]: Abstraction has 281 states and 307 transitions. [2018-01-21 00:44:13,080 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 00:44:13,080 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 307 transitions. [2018-01-21 00:44:13,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2018-01-21 00:44:13,083 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:13,084 INFO L322 BasicCegarLoop]: trace histogram [67, 56, 56, 56, 56, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:13,084 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:13,084 INFO L82 PathProgramCache]: Analyzing trace with hash -785380599, now seen corresponding path program 12 times [2018-01-21 00:44:13,084 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:13,085 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:13,085 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:13,085 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:13,086 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:13,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:13,130 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:13,675 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 9262 trivial. 0 not checked. [2018-01-21 00:44:13,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:13,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:13,675 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:13,675 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:13,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:13,676 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:13,683 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:13,683 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:13,716 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,722 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,727 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,733 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,740 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,750 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,761 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,777 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,790 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,807 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,848 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,900 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,920 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:13,973 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,012 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,065 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,067 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:14,073 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:14,271 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 00:44:14,271 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:14,760 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 00:44:14,795 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:14,795 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 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 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:14,802 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:14,802 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:14,834 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,849 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,871 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,905 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:14,976 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:20,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:22,122 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:27,634 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:39,683 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:51,753 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 00:45:03,808 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown