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.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:47:24,310 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:47:24,312 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:47:24,325 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:47:24,325 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:47:24,326 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:47:24,327 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:47:24,329 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:47:24,330 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:47:24,331 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:47:24,331 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:47:24,332 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:47:24,332 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:47:24,333 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:47:24,334 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:47:24,337 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:47:24,339 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:47:24,341 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:47:24,342 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:47:24,343 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:47:24,345 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-20 23:47:24,350 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:47:24,351 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:47:24,351 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.epf [2018-01-20 23:47:24,361 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:47:24,361 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:47:24,362 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:47:24,362 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:47:24,362 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:47:24,362 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:47:24,362 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:47:24,363 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:47:24,363 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:47:24,363 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:47:24,364 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:47:24,364 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:47:24,364 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:47:24,364 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:47:24,364 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:47:24,364 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:47:24,365 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:47:24,365 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:47:24,365 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:47:24,365 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:47:24,365 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:47:24,366 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:47:24,366 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:47:24,366 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:47:24,366 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:47:24,366 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:47:24,367 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:47:24,367 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:47:24,367 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:47:24,367 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:47:24,367 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:47:24,367 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:47:24,368 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:47:24,368 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:47:24,368 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:47:24,368 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:47:24,369 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:47:24,369 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:47:24,402 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:47:24,413 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:47:24,416 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:47:24,417 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:47:24,417 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:47:24,418 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-20 23:47:24,524 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:47:24,529 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:47:24,531 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:47:24,531 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:47:24,538 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:47:24,539 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,541 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23155f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24, skipping insertion in model container [2018-01-20 23:47:24,542 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,559 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:47:24,578 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:47:24,691 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:47:24,706 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:47:24,711 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24 WrapperNode [2018-01-20 23:47:24,711 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:47:24,712 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:47:24,712 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:47:24,712 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:47:24,725 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,732 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (1/1) ... [2018-01-20 23:47:24,740 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:47:24,741 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:47:24,741 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:47:24,741 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:47:24,742 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (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 [2018-01-20 23:47:24,785 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:47:24,785 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:47:24,785 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:47:24,785 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:47:24,786 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:47:24,786 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:47:24,786 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:47:24,786 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:47:24,786 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:47:24,786 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:47:24,787 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:47:24,787 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:47:24,787 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:47:24,944 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:47:24,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:47:24 BoogieIcfgContainer [2018-01-20 23:47:24,945 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:47:24,946 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:47:24,946 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:47:24,948 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:47:24,949 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:47:24" (1/3) ... [2018-01-20 23:47:24,950 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418b77a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:47:24, skipping insertion in model container [2018-01-20 23:47:24,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:47:24" (2/3) ... [2018-01-20 23:47:24,950 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418b77a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:47:24, skipping insertion in model container [2018-01-20 23:47:24,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:47:24" (3/3) ... [2018-01-20 23:47:24,952 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-20 23:47:24,959 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:47:24,965 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:47:25,008 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:47:25,008 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:47:25,009 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:47:25,009 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:47:25,009 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:47:25,009 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:47:25,009 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:47:25,009 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:47:25,010 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:47:25,025 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:47:25,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:47:25,030 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:25,031 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:47:25,031 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:47:25,037 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-20 23:47:25,040 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:25,086 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,086 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:25,086 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,087 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:25,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:47:25,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:47:25,143 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:47:25,149 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:47:25,155 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:47:25,155 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:47:25,155 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:47:25,155 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:47:25,155 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:47:25,155 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:47:25,155 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:47:25,156 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:47:25,156 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:47:25,157 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:47:25,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:47:25,158 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:25,158 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:25,158 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:47:25,159 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-20 23:47:25,159 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:25,159 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,160 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:25,160 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,160 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:25,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:25,183 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:25,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:25,219 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:47:25,220 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:47:25,220 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:47:25,222 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:47:25,233 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:47:25,234 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:47:25,236 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:47:25,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:25,269 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:47:25,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:47:25,271 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:47:25,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:25,278 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:47:25,278 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:47:25,282 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 [2018-01-20 23:47:25,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:47:25,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:47:25,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:47:25,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:47:25,382 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:47:25,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:25,383 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:47:25,383 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:47:25,383 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:47:25,383 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:47:25,386 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:47:25,386 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:47:25,386 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:47:25,386 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:47:25,386 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:47:25,387 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:47:25,387 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:47:25,387 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:47:25,387 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:47:25,388 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:47:25,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:47:25,389 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:25,389 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:25,389 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:25,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-20 23:47:25,390 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:25,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,391 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:25,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,391 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:25,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:25,399 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:25,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:25,410 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:47:25,411 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:47:25,411 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:47:25,411 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:47:25,411 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:47:25,411 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:47:25,411 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:47:25,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:25,416 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:47:25,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:47:25,416 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:47:25,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:25,418 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:47:25,418 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:47:25,419 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 [2018-01-20 23:47:25,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:47:25,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:47:25,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:47:25,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-20 23:47:25,428 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-20 23:47:25,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:25,429 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-20 23:47:25,429 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:47:25,429 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-20 23:47:25,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:47:25,430 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:25,430 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:25,430 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:25,430 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-20 23:47:25,430 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:25,431 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,432 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:25,432 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,432 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:25,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:25,442 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:25,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:25,479 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:47:25,480 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:47:25,480 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:47:25,481 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:47:25,481 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:47:25,481 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:47:25,482 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-20 23:47:25,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:25,540 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-20 23:47:25,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:47:25,541 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:47:25,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:25,545 INFO L225 Difference]: With dead ends: 66 [2018-01-20 23:47:25,545 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:47:25,546 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 [2018-01-20 23:47:25,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:47:25,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-20 23:47:25,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:47:25,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-20 23:47:25,558 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-20 23:47:25,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:25,558 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-20 23:47:25,559 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:47:25,559 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-20 23:47:25,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:47:25,560 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:25,560 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:25,560 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:25,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-20 23:47:25,561 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:25,561 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,562 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:25,562 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:25,562 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:25,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:25,580 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:25,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:25,628 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:25,666 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:25,667 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-20 23:47:25,670 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-20 23:47:25,717 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:47:25,717 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:47:27,310 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:47:27,312 INFO L268 AbstractInterpreter]: Visited 30 different actions 92 times. Merged at 14 different actions 41 times. Never widened. Found 4 fixpoints after 2 different actions. Largest state had 17 variables. [2018-01-20 23:47:27,325 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:47:27,326 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:27,326 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 [2018-01-20 23:47:27,338 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:27,338 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:47:27,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:27,369 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:27,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:27,435 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:27,655 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-20 23:47:27,655 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 9 [2018-01-20 23:47:27,655 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:47:27,656 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:47:27,656 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:47:27,657 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-01-20 23:47:27,657 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-20 23:47:27,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:27,752 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-20 23:47:27,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:47:27,752 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-20 23:47:27,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:27,754 INFO L225 Difference]: With dead ends: 80 [2018-01-20 23:47:27,754 INFO L226 Difference]: Without dead ends: 46 [2018-01-20 23:47:27,755 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-01-20 23:47:27,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-20 23:47:27,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-20 23:47:27,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-20 23:47:27,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-20 23:47:27,761 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-20 23:47:27,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:27,761 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-20 23:47:27,762 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:47:27,762 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-20 23:47:27,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-20 23:47:27,763 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:27,763 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:27,764 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:27,764 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-20 23:47:27,764 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:27,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:27,766 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:27,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:27,766 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:27,783 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:27,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:47:27,831 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:27,831 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:27,831 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-20 23:47:27,831 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-20 23:47:27,833 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:47:27,833 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:47:28,559 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:47:28,559 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-20 23:47:28,564 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:47:28,564 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:28,565 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:47:28,576 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:28,577 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:47:28,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:28,600 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:28,661 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:28,661 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:28,881 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:47:28,917 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:28,918 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 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 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:47:28,929 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:28,930 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:47:28,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:28,967 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:29,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:47:29,009 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:29,079 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:47:29,081 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:29,081 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6, 4, 4] total 13 [2018-01-20 23:47:29,081 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:29,082 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-20 23:47:29,082 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-20 23:47:29,082 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2018-01-20 23:47:29,083 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-20 23:47:29,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:29,301 INFO L93 Difference]: Finished difference Result 111 states and 126 transitions. [2018-01-20 23:47:29,302 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-20 23:47:29,302 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-20 23:47:29,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:29,303 INFO L225 Difference]: With dead ends: 111 [2018-01-20 23:47:29,304 INFO L226 Difference]: Without dead ends: 75 [2018-01-20 23:47:29,304 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2018-01-20 23:47:29,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-20 23:47:29,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 57. [2018-01-20 23:47:29,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-20 23:47:29,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-20 23:47:29,313 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 36 [2018-01-20 23:47:29,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:29,313 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-20 23:47:29,313 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-20 23:47:29,313 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-20 23:47:29,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-20 23:47:29,316 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:29,316 INFO L322 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:29,316 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:29,317 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 2 times [2018-01-20 23:47:29,317 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:29,318 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:29,318 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:29,318 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:29,318 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:29,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:29,342 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:29,412 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-20 23:47:29,412 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:29,412 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:29,413 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:29,413 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:29,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:29,413 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 [2018-01-20 23:47:29,421 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:47:29,421 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:29,434 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:29,449 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:29,451 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:29,454 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:29,532 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:47:29,532 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:29,695 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:47:29,716 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:29,716 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 [2018-01-20 23:47:29,719 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:47:29,720 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:29,734 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:29,750 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:29,761 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:29,765 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:29,778 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-20 23:47:29,778 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:29,820 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-20 23:47:29,822 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:29,822 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8, 5, 5] total 18 [2018-01-20 23:47:29,822 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:29,822 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-20 23:47:29,823 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-20 23:47:29,823 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-01-20 23:47:29,823 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 11 states. [2018-01-20 23:47:30,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:30,033 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2018-01-20 23:47:30,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-20 23:47:30,034 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 62 [2018-01-20 23:47:30,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:30,035 INFO L225 Difference]: With dead ends: 163 [2018-01-20 23:47:30,036 INFO L226 Difference]: Without dead ends: 121 [2018-01-20 23:47:30,036 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 231 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2018-01-20 23:47:30,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-20 23:47:30,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 87. [2018-01-20 23:47:30,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-20 23:47:30,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 95 transitions. [2018-01-20 23:47:30,046 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 95 transitions. Word has length 62 [2018-01-20 23:47:30,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:30,047 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 95 transitions. [2018-01-20 23:47:30,047 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-20 23:47:30,047 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 95 transitions. [2018-01-20 23:47:30,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-20 23:47:30,049 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:30,050 INFO L322 BasicCegarLoop]: trace histogram [11, 8, 8, 8, 8, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:30,050 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:30,050 INFO L82 PathProgramCache]: Analyzing trace with hash -780821890, now seen corresponding path program 3 times [2018-01-20 23:47:30,050 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:30,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:30,051 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:30,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:30,052 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:30,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:30,080 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:30,181 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-20 23:47:30,182 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:30,182 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:30,182 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:30,182 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:30,182 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:30,182 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 [2018-01-20 23:47:30,190 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:47:30,190 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:47:30,204 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,209 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,215 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,222 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,223 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:30,228 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:30,251 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-20 23:47:30,252 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:30,312 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-20 23:47:30,337 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:30,338 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 [2018-01-20 23:47:30,341 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:47:30,341 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:47:30,359 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,372 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,394 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,424 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:30,441 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:30,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:30,458 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-20 23:47:30,459 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:30,497 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-20 23:47:30,499 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:30,499 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-20 23:47:30,499 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:30,500 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-20 23:47:30,500 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-20 23:47:30,500 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:47:30,500 INFO L87 Difference]: Start difference. First operand 87 states and 95 transitions. Second operand 7 states. [2018-01-20 23:47:30,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:30,567 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2018-01-20 23:47:30,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:47:30,568 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 93 [2018-01-20 23:47:30,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:30,569 INFO L225 Difference]: With dead ends: 146 [2018-01-20 23:47:30,569 INFO L226 Difference]: Without dead ends: 121 [2018-01-20 23:47:30,570 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:47:30,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-20 23:47:30,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 96. [2018-01-20 23:47:30,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-20 23:47:30,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-20 23:47:30,579 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 93 [2018-01-20 23:47:30,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:30,580 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-20 23:47:30,580 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-20 23:47:30,580 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-20 23:47:30,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-20 23:47:30,581 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:30,582 INFO L322 BasicCegarLoop]: trace histogram [15, 11, 11, 11, 11, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:30,582 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:30,582 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 4 times [2018-01-20 23:47:30,582 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:30,582 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:30,583 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:30,583 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:30,583 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:30,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:30,611 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:30,698 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2018-01-20 23:47:30,732 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:30,732 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:30,732 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:30,733 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:30,733 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:30,733 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 [2018-01-20 23:47:30,739 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:47:30,739 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:47:30,768 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:30,772 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:30,861 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-20 23:47:30,861 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:31,041 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-20 23:47:31,062 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:31,062 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 [2018-01-20 23:47:31,065 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:47:31,066 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:47:31,109 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:31,114 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:31,143 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-20 23:47:31,144 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:31,320 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-20 23:47:31,321 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:31,322 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10, 10, 10] total 19 [2018-01-20 23:47:31,322 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:31,322 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-20 23:47:31,322 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-20 23:47:31,322 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:47:31,323 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 15 states. [2018-01-20 23:47:31,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:31,562 INFO L93 Difference]: Finished difference Result 256 states and 287 transitions. [2018-01-20 23:47:31,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-20 23:47:31,562 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 119 [2018-01-20 23:47:31,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:31,564 INFO L225 Difference]: With dead ends: 256 [2018-01-20 23:47:31,564 INFO L226 Difference]: Without dead ends: 194 [2018-01-20 23:47:31,565 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 454 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-01-20 23:47:31,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-01-20 23:47:31,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2018-01-20 23:47:31,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-20 23:47:31,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-20 23:47:31,576 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-20 23:47:31,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:31,576 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-20 23:47:31,576 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-20 23:47:31,576 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-20 23:47:31,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-20 23:47:31,578 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:31,578 INFO L322 BasicCegarLoop]: trace histogram [22, 17, 17, 17, 17, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:31,578 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:31,579 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 5 times [2018-01-20 23:47:31,579 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:31,579 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:31,579 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:31,579 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:31,579 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:31,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:31,609 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:31,766 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-20 23:47:31,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:31,767 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:31,767 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:31,767 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:31,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:31,767 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 [2018-01-20 23:47:31,773 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:47:31,773 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:31,788 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,789 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,791 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,794 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,797 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,802 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,809 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,814 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:31,816 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:31,820 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:32,024 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 580 proven. 204 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2018-01-20 23:47:32,025 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:32,375 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 245 proven. 355 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2018-01-20 23:47:32,396 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:32,396 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 [2018-01-20 23:47:32,399 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:47:32,399 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:32,413 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,417 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,425 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,435 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,450 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,475 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,507 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,543 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:32,560 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:32,566 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:32,642 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 607 proven. 208 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-01-20 23:47:32,642 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:32,890 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 277 proven. 376 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2018-01-20 23:47:32,892 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:32,892 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15, 15, 15] total 33 [2018-01-20 23:47:32,892 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:32,893 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:47:32,893 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:47:32,893 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2018-01-20 23:47:32,893 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 21 states. [2018-01-20 23:47:33,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:33,380 INFO L93 Difference]: Finished difference Result 307 states and 344 transitions. [2018-01-20 23:47:33,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-20 23:47:33,380 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2018-01-20 23:47:33,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:33,383 INFO L225 Difference]: With dead ends: 307 [2018-01-20 23:47:33,383 INFO L226 Difference]: Without dead ends: 233 [2018-01-20 23:47:33,385 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 605 SyntacticMatches, 15 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=416, Invalid=2034, Unknown=0, NotChecked=0, Total=2450 [2018-01-20 23:47:33,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-01-20 23:47:33,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 171. [2018-01-20 23:47:33,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-01-20 23:47:33,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 190 transitions. [2018-01-20 23:47:33,401 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 190 transitions. Word has length 160 [2018-01-20 23:47:33,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:33,402 INFO L432 AbstractCegarLoop]: Abstraction has 171 states and 190 transitions. [2018-01-20 23:47:33,402 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:47:33,402 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 190 transitions. [2018-01-20 23:47:33,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-01-20 23:47:33,405 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:33,405 INFO L322 BasicCegarLoop]: trace histogram [30, 24, 24, 24, 24, 7, 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] [2018-01-20 23:47:33,405 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:33,405 INFO L82 PathProgramCache]: Analyzing trace with hash 896426349, now seen corresponding path program 6 times [2018-01-20 23:47:33,405 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:33,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:33,406 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:33,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:33,406 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:33,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:33,440 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:33,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-20 23:47:33,604 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:33,604 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:33,604 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:33,604 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:33,605 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:33,605 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 [2018-01-20 23:47:33,610 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:47:33,610 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:47:33,624 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,627 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,630 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,631 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,634 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,636 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,640 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,642 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,646 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,650 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,654 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,659 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,660 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:33,664 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:33,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-20 23:47:33,688 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:33,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-20 23:47:33,810 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:33,810 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 [2018-01-20 23:47:33,813 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:47:33,813 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:47:33,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,842 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,861 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,874 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,892 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,914 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,940 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:33,982 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:34,037 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:34,180 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:34,352 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:34,583 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:34,606 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:34,613 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:34,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-20 23:47:34,634 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:34,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-20 23:47:34,689 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:34,690 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-20 23:47:34,690 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:34,690 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:47:34,690 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:47:34,690 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:47:34,690 INFO L87 Difference]: Start difference. First operand 171 states and 190 transitions. Second operand 10 states. [2018-01-20 23:47:34,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:34,767 INFO L93 Difference]: Finished difference Result 257 states and 288 transitions. [2018-01-20 23:47:34,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:47:34,767 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 206 [2018-01-20 23:47:34,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:34,770 INFO L225 Difference]: With dead ends: 257 [2018-01-20 23:47:34,770 INFO L226 Difference]: Without dead ends: 220 [2018-01-20 23:47:34,771 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 816 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:47:34,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-20 23:47:34,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 180. [2018-01-20 23:47:34,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-20 23:47:34,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-20 23:47:34,785 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 206 [2018-01-20 23:47:34,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:34,786 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-20 23:47:34,786 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:47:34,786 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-20 23:47:34,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-20 23:47:34,790 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:34,790 INFO L322 BasicCegarLoop]: trace histogram [36, 29, 29, 29, 29, 8, 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] [2018-01-20 23:47:34,790 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:34,790 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 7 times [2018-01-20 23:47:34,790 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:34,791 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:34,791 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:34,792 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:34,792 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:34,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:34,827 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:35,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-01-20 23:47:35,049 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:35,049 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:35,049 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:35,049 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:35,049 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:35,049 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 [2018-01-20 23:47:35,055 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:35,056 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:47:35,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:35,115 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:35,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-20 23:47:35,334 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:35,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-20 23:47:35,622 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:35,622 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 [2018-01-20 23:47:35,626 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:35,626 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:47:35,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:35,718 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-20 23:47:35,798 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:36,029 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-20 23:47:36,031 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:36,031 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-20 23:47:36,031 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:36,032 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-20 23:47:36,032 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-20 23:47:36,032 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-20 23:47:36,032 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-20 23:47:36,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:36,429 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-20 23:47:36,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-20 23:47:36,429 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-20 23:47:36,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:36,432 INFO L225 Difference]: With dead ends: 460 [2018-01-20 23:47:36,432 INFO L226 Difference]: Without dead ends: 365 [2018-01-20 23:47:36,433 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:47:36,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-20 23:47:36,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-20 23:47:36,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-20 23:47:36,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-20 23:47:36,446 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-20 23:47:36,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:36,446 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-20 23:47:36,446 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-20 23:47:36,446 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-20 23:47:36,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-20 23:47:36,448 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:36,448 INFO L322 BasicCegarLoop]: trace histogram [46, 38, 38, 38, 38, 9, 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] [2018-01-20 23:47:36,448 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:36,448 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 8 times [2018-01-20 23:47:36,449 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:36,449 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:36,449 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:47:36,450 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:36,450 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:36,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:36,487 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:36,750 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 4291 trivial. 0 not checked. [2018-01-20 23:47:36,750 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:36,750 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:36,750 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:36,751 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:36,751 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:36,751 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 [2018-01-20 23:47:36,756 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:47:36,756 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:36,780 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:36,811 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:36,817 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:36,822 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:37,023 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-20 23:47:37,023 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:37,466 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-20 23:47:37,487 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:37,487 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 [2018-01-20 23:47:37,490 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:47:37,490 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:37,521 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:37,574 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:37,613 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:37,622 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:37,696 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-20 23:47:37,696 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:37,902 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-20 23:47:37,903 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:37,903 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16, 16, 16] total 32 [2018-01-20 23:47:37,904 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:37,904 INFO L409 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-01-20 23:47:37,904 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-01-20 23:47:37,904 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:47:37,905 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 25 states. [2018-01-20 23:47:38,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:38,441 INFO L93 Difference]: Finished difference Result 570 states and 639 transitions. [2018-01-20 23:47:38,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-20 23:47:38,442 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 298 [2018-01-20 23:47:38,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:38,444 INFO L225 Difference]: With dead ends: 570 [2018-01-20 23:47:38,445 INFO L226 Difference]: Without dead ends: 463 [2018-01-20 23:47:38,446 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1216 GetRequests, 1155 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=405, Invalid=1757, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:47:38,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-20 23:47:38,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 275. [2018-01-20 23:47:38,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2018-01-20 23:47:38,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 309 transitions. [2018-01-20 23:47:38,465 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 309 transitions. Word has length 298 [2018-01-20 23:47:38,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:38,466 INFO L432 AbstractCegarLoop]: Abstraction has 275 states and 309 transitions. [2018-01-20 23:47:38,466 INFO L433 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-01-20 23:47:38,466 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 309 transitions. [2018-01-20 23:47:38,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-20 23:47:38,469 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:38,469 INFO L322 BasicCegarLoop]: trace histogram [57, 48, 48, 48, 48, 10, 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] [2018-01-20 23:47:38,469 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:38,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 9 times [2018-01-20 23:47:38,469 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:38,470 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:38,470 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:38,470 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:38,470 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:38,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:38,510 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:38,829 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 6720 trivial. 0 not checked. [2018-01-20 23:47:38,830 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:38,830 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:38,830 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:38,830 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:38,830 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:38,830 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:47:38,836 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:47:38,836 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:47:38,859 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,874 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,890 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,906 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,923 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,928 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,936 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,941 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,946 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:38,947 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:38,951 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:39,252 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-20 23:47:39,252 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:39,640 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-20 23:47:39,672 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:39,673 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 [2018-01-20 23:47:39,677 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:47:39,678 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:47:39,716 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:39,727 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:39,748 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:39,784 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:39,840 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:39,988 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:40,166 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:40,406 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:40,783 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:47:40,819 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:40,826 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:40,877 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-20 23:47:40,877 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:41,085 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-20 23:47:41,087 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:41,088 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13, 13, 13] total 32 [2018-01-20 23:47:41,088 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:41,088 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:47:41,088 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:47:41,089 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=728, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:47:41,089 INFO L87 Difference]: Start difference. First operand 275 states and 309 transitions. Second operand 21 states. [2018-01-20 23:47:41,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:41,451 INFO L93 Difference]: Finished difference Result 650 states and 740 transitions. [2018-01-20 23:47:41,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-20 23:47:41,452 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 359 [2018-01-20 23:47:41,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:41,456 INFO L225 Difference]: With dead ends: 650 [2018-01-20 23:47:41,456 INFO L226 Difference]: Without dead ends: 601 [2018-01-20 23:47:41,458 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1454 GetRequests, 1414 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=424, Invalid=1136, Unknown=0, NotChecked=0, Total=1560 [2018-01-20 23:47:41,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2018-01-20 23:47:41,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 338. [2018-01-20 23:47:41,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-20 23:47:41,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 385 transitions. [2018-01-20 23:47:41,484 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 385 transitions. Word has length 359 [2018-01-20 23:47:41,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:41,485 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 385 transitions. [2018-01-20 23:47:41,485 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:47:41,485 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 385 transitions. [2018-01-20 23:47:41,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-20 23:47:41,488 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:41,488 INFO L322 BasicCegarLoop]: trace histogram [69, 59, 59, 59, 59, 11, 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] [2018-01-20 23:47:41,488 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:41,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1164518591, now seen corresponding path program 10 times [2018-01-20 23:47:41,489 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:41,490 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:41,490 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:41,490 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:41,490 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:41,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:41,532 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:41,908 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 10005 trivial. 0 not checked. [2018-01-20 23:47:41,908 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:41,908 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:41,908 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:41,909 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:41,909 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:41,909 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 [2018-01-20 23:47:41,915 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:47:41,915 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:47:41,992 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:41,999 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:42,260 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-20 23:47:42,260 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:42,696 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-20 23:47:42,716 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:42,716 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 [2018-01-20 23:47:42,719 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:47:42,719 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:47:42,866 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:42,876 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:42,965 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-20 23:47:42,965 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:43,239 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-20 23:47:43,241 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:43,241 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 20, 20, 20] total 40 [2018-01-20 23:47:43,241 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:43,242 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-20 23:47:43,243 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-20 23:47:43,243 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1273, Unknown=0, NotChecked=0, Total=1560 [2018-01-20 23:47:43,243 INFO L87 Difference]: Start difference. First operand 338 states and 385 transitions. Second operand 31 states. [2018-01-20 23:47:45,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:45,026 INFO L93 Difference]: Finished difference Result 858 states and 980 transitions. [2018-01-20 23:47:45,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-20 23:47:45,026 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 425 [2018-01-20 23:47:45,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:45,030 INFO L225 Difference]: With dead ends: 858 [2018-01-20 23:47:45,030 INFO L226 Difference]: Without dead ends: 717 [2018-01-20 23:47:45,032 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1653 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=616, Invalid=2806, Unknown=0, NotChecked=0, Total=3422 [2018-01-20 23:47:45,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2018-01-20 23:47:45,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 398. [2018-01-20 23:47:45,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2018-01-20 23:47:45,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 451 transitions. [2018-01-20 23:47:45,056 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 451 transitions. Word has length 425 [2018-01-20 23:47:45,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:45,056 INFO L432 AbstractCegarLoop]: Abstraction has 398 states and 451 transitions. [2018-01-20 23:47:45,056 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-20 23:47:45,057 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 451 transitions. [2018-01-20 23:47:45,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2018-01-20 23:47:45,072 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:45,072 INFO L322 BasicCegarLoop]: trace histogram [81, 70, 70, 70, 70, 12, 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] [2018-01-20 23:47:45,072 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:45,073 INFO L82 PathProgramCache]: Analyzing trace with hash -153318926, now seen corresponding path program 11 times [2018-01-20 23:47:45,073 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:45,073 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:45,074 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:45,074 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:45,074 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:45,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:45,107 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:45,560 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 13945 trivial. 0 not checked. [2018-01-20 23:47:45,561 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:45,561 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:45,561 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:45,561 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:45,561 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:45,561 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 [2018-01-20 23:47:45,567 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:47:45,567 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:45,598 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,602 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,607 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,613 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,620 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,627 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,634 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,643 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,650 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:45,652 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:45,659 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:45,975 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-20 23:47:45,975 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:46,951 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-20 23:47:46,971 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:46,971 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 [2018-01-20 23:47:46,975 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:47:46,975 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:47:47,011 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,021 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,043 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,077 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,143 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,298 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,412 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,557 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,714 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:47:47,746 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:47,754 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-20 23:47:47,852 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:48,198 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-20 23:47:48,200 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:47:48,200 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 21, 21, 21] total 44 [2018-01-20 23:47:48,200 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:47:48,201 INFO L409 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-01-20 23:47:48,201 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-01-20 23:47:48,202 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1611, Unknown=0, NotChecked=0, Total=1892 [2018-01-20 23:47:48,202 INFO L87 Difference]: Start difference. First operand 398 states and 451 transitions. Second operand 33 states. [2018-01-20 23:47:49,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:47:49,496 INFO L93 Difference]: Finished difference Result 969 states and 1094 transitions. [2018-01-20 23:47:49,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-20 23:47:49,496 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 491 [2018-01-20 23:47:49,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:47:49,500 INFO L225 Difference]: With dead ends: 969 [2018-01-20 23:47:49,500 INFO L226 Difference]: Without dead ends: 555 [2018-01-20 23:47:49,503 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2019 GetRequests, 1925 SyntacticMatches, 20 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1648 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=919, Invalid=4781, Unknown=0, NotChecked=0, Total=5700 [2018-01-20 23:47:49,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2018-01-20 23:47:49,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 399. [2018-01-20 23:47:49,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-01-20 23:47:49,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 444 transitions. [2018-01-20 23:47:49,532 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 444 transitions. Word has length 491 [2018-01-20 23:47:49,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:47:49,532 INFO L432 AbstractCegarLoop]: Abstraction has 399 states and 444 transitions. [2018-01-20 23:47:49,532 INFO L433 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-01-20 23:47:49,533 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 444 transitions. [2018-01-20 23:47:49,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 553 [2018-01-20 23:47:49,537 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:47:49,537 INFO L322 BasicCegarLoop]: trace histogram [92, 80, 80, 80, 80, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:47:49,538 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:47:49,538 INFO L82 PathProgramCache]: Analyzing trace with hash 1811475687, now seen corresponding path program 12 times [2018-01-20 23:47:49,538 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:47:49,539 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:49,539 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:47:49,539 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:47:49,539 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:47:49,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:47:49,591 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:47:50,165 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 18116 trivial. 0 not checked. [2018-01-20 23:47:50,165 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:50,165 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:47:50,165 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:47:50,166 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:47:50,166 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:50,166 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:47:50,171 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:47:50,171 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:47:50,201 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,211 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,218 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,223 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,228 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,234 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,241 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,251 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,263 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,284 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,295 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,311 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,325 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,336 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,346 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,356 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,384 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,395 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,407 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:50,409 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:47:50,418 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:47:50,786 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-20 23:47:50,786 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:47:51,694 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-20 23:47:51,728 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:47:51,728 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 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 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:47:51,733 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:47:51,733 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:47:51,791 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:51,807 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:51,845 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:51,894 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:51,996 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:52,133 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:52,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:48:02,516 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-20 23:48:14,569 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown