java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_imprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:43:56,149 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:43:56,150 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:43:56,164 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:43:56,165 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:43:56,165 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:43:56,166 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:43:56,167 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:43:56,169 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:43:56,169 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:43:56,170 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 00:43:56,170 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 00:43:56,171 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 00:43:56,171 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 00:43:56,172 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 00:43:56,175 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 00:43:56,177 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 00:43:56,179 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 00:43:56,180 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 00:43:56,182 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 00:43:56,184 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 00:43:56,189 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 00:43:56,190 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 00:43:56,190 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_imprecise.epf [2018-01-21 00:43:56,200 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:43:56,200 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:43:56,201 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:43:56,201 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:43:56,202 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:43:56,202 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-21 00:43:56,202 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:43:56,202 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:43:56,203 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:43:56,203 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:43:56,203 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:43:56,203 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:43:56,204 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:43:56,204 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:43:56,204 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:43:56,204 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:43:56,204 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:43:56,205 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:43:56,205 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:43:56,205 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:43:56,205 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:43:56,205 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:43:56,206 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:43:56,206 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:43:56,206 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:43:56,206 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:43:56,206 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:43:56,207 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:43:56,207 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:43:56,207 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:43:56,207 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:43:56,207 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:43:56,207 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:43:56,208 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:43:56,208 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:43:56,208 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:43:56,208 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:43:56,209 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:43:56,209 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:43:56,245 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:43:56,259 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:43:56,264 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:43:56,266 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:43:56,266 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:43:56,267 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 00:43:56,388 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:43:56,394 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:43:56,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:43:56,395 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:43:56,403 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:43:56,404 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,407 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29a64a89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56, skipping insertion in model container [2018-01-21 00:43:56,407 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,426 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:43:56,446 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:43:56,561 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:43:56,577 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:43:56,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56 WrapperNode [2018-01-21 00:43:56,583 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:43:56,584 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:43:56,584 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:43:56,584 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:43:56,601 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,611 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,611 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,614 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,617 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,618 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... [2018-01-21 00:43:56,619 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:43:56,620 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:43:56,620 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:43:56,620 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:43:56,621 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:43:56,667 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:43:56,668 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:43:56,668 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 00:43:56,668 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 00:43:56,668 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:43:56,669 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:43:56,669 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:43:56,846 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:43:56,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:43:56 BoogieIcfgContainer [2018-01-21 00:43:56,847 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:43:56,848 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:43:56,848 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:43:56,850 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:43:56,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:43:56" (1/3) ... [2018-01-21 00:43:56,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b55f757 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:43:56, skipping insertion in model container [2018-01-21 00:43:56,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:43:56" (2/3) ... [2018-01-21 00:43:56,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b55f757 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:43:56, skipping insertion in model container [2018-01-21 00:43:56,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:43:56" (3/3) ... [2018-01-21 00:43:56,854 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 00:43:56,863 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:43:56,871 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 00:43:56,915 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:43:56,915 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:43:56,915 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:43:56,915 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:43:56,915 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:43:56,916 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:43:56,916 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:43:56,916 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:43:56,917 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:43:56,936 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 00:43:56,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:43:56,941 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:56,942 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:43:56,943 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:43:56,947 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 00:43:56,949 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:56,994 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:56,994 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:56,994 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:56,994 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:43:57,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:43:57,051 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:43:57,057 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:43:57,064 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:43:57,064 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:43:57,064 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:43:57,064 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:43:57,064 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:43:57,064 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:43:57,065 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:43:57,065 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 00:43:57,065 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:43:57,067 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 00:43:57,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 00:43:57,068 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:57,069 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:57,069 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 00:43:57,069 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 00:43:57,069 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:57,071 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,071 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:57,071 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,071 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,102 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:57,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:43:57,139 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:57,139 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:43:57,139 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:57,141 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:43:57,153 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:43:57,153 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:43:57,155 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 00:43:57,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:57,179 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 00:43:57,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:43:57,180 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 00:43:57,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:57,187 INFO L225 Difference]: With dead ends: 78 [2018-01-21 00:43:57,187 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 00:43:57,190 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:43:57,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 00:43:57,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 00:43:57,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 00:43:57,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 00:43:57,282 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 00:43:57,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:57,283 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 00:43:57,283 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:43:57,283 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 00:43:57,283 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 00:43:57,286 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:43:57,286 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:43:57,287 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:43:57,287 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:43:57,287 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:43:57,287 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:43:57,287 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:43:57,287 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:43:57,287 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:43:57,289 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 00:43:57,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 00:43:57,291 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:57,291 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:57,291 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:57,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 00:43:57,292 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:57,293 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,293 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:57,293 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,293 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,303 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:57,312 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:43:57,313 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:57,313 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:43:57,313 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:57,313 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:43:57,313 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:43:57,313 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:43:57,314 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 00:43:57,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:57,318 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 00:43:57,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:43:57,318 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 00:43:57,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:57,320 INFO L225 Difference]: With dead ends: 78 [2018-01-21 00:43:57,320 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 00:43:57,321 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:43:57,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 00:43:57,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 00:43:57,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 00:43:57,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 00:43:57,331 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 00:43:57,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:57,332 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 00:43:57,332 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:43:57,332 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 00:43:57,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 00:43:57,333 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:57,333 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:57,333 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:57,333 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 00:43:57,333 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:57,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,334 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:57,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,334 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,347 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:57,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:43:57,385 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:43:57,385 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 00:43:57,385 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:57,387 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 00:43:57,388 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 00:43:57,388 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:43:57,388 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 00:43:57,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:57,459 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 00:43:57,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 00:43:57,460 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 00:43:57,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:57,464 INFO L225 Difference]: With dead ends: 73 [2018-01-21 00:43:57,464 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 00:43:57,465 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:43:57,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 00:43:57,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 00:43:57,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 00:43:57,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 00:43:57,477 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 00:43:57,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:57,478 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 00:43:57,478 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 00:43:57,478 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 00:43:57,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 00:43:57,479 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:57,480 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:57,480 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:57,480 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 00:43:57,480 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:57,481 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,481 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:57,482 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:57,482 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:57,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,497 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:57,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:43:57,556 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,556 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:57,557 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 00:43:57,560 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 00:43:57,608 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:43:57,608 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:43:57,833 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:43:57,834 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 00:43:57,846 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:43:57,847 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:57,847 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:43:57,856 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:57,856 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:43:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:57,885 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:57,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:43:57,979 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:58,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 00:43:58,207 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 00:43:58,208 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 8 [2018-01-21 00:43:58,208 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:43:58,208 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:43:58,209 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:43:58,209 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-01-21 00:43:58,209 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 00:43:58,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:58,373 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 00:43:58,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 00:43:58,374 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 00:43:58,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:58,375 INFO L225 Difference]: With dead ends: 86 [2018-01-21 00:43:58,376 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 00:43:58,377 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-01-21 00:43:58,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 00:43:58,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-01-21 00:43:58,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 00:43:58,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-01-21 00:43:58,384 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 34 [2018-01-21 00:43:58,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:58,384 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-01-21 00:43:58,384 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:43:58,385 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-01-21 00:43:58,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 00:43:58,386 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:58,386 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:58,386 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:58,387 INFO L82 PathProgramCache]: Analyzing trace with hash 2113336574, now seen corresponding path program 1 times [2018-01-21 00:43:58,387 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:58,388 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:58,389 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:58,389 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:58,389 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:58,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:58,406 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:58,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:43:58,451 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:58,451 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:58,452 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 00:43:58,452 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 00:43:58,454 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:43:58,454 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:43:58,672 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:43:58,673 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 00:43:58,680 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:43:58,680 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:58,681 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 [2018-01-21 00:43:58,692 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:58,693 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:43:58,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:58,723 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:58,737 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:43:58,737 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:58,779 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:43:58,813 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:58,813 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 [2018-01-21 00:43:58,818 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:58,818 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:43:58,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:58,859 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:58,865 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:43:58,865 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:58,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:43:58,918 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:43:58,918 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 00:43:58,919 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:43:58,919 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:43:58,919 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:43:58,920 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:43:58,920 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 5 states. [2018-01-21 00:43:58,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:59,000 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2018-01-21 00:43:59,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 00:43:59,000 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 00:43:59,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:59,002 INFO L225 Difference]: With dead ends: 94 [2018-01-21 00:43:59,002 INFO L226 Difference]: Without dead ends: 76 [2018-01-21 00:43:59,003 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:43:59,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-21 00:43:59,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-01-21 00:43:59,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 00:43:59,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2018-01-21 00:43:59,012 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 39 [2018-01-21 00:43:59,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:59,012 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2018-01-21 00:43:59,013 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:43:59,013 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2018-01-21 00:43:59,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 00:43:59,015 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:59,016 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:59,016 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:59,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1575876768, now seen corresponding path program 2 times [2018-01-21 00:43:59,016 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:59,017 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:59,018 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:43:59,018 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:59,018 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:59,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:59,043 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:59,112 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 00:43:59,112 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,112 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:59,113 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:43:59,113 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:43:59,113 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,113 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:43:59,120 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:43:59,120 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:43:59,134 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,144 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,145 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:59,149 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:59,214 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 00:43:59,214 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:59,328 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 00:43:59,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,349 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:43:59,352 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:43:59,352 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:43:59,370 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,386 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:43:59,396 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:59,401 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:59,421 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 00:43:59,421 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:59,477 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 00:43:59,478 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:43:59,478 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 00:43:59,478 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:43:59,479 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 00:43:59,479 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 00:43:59,480 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 00:43:59,480 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 10 states. [2018-01-21 00:43:59,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:43:59,696 INFO L93 Difference]: Finished difference Result 164 states and 184 transitions. [2018-01-21 00:43:59,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 00:43:59,697 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 57 [2018-01-21 00:43:59,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:43:59,698 INFO L225 Difference]: With dead ends: 164 [2018-01-21 00:43:59,699 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 00:43:59,700 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 00:43:59,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 00:43:59,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 86. [2018-01-21 00:43:59,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 00:43:59,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2018-01-21 00:43:59,711 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 57 [2018-01-21 00:43:59,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:43:59,712 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2018-01-21 00:43:59,712 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 00:43:59,712 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2018-01-21 00:43:59,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 00:43:59,714 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:43:59,714 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:43:59,714 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:43:59,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1577101506, now seen corresponding path program 3 times [2018-01-21 00:43:59,714 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:43:59,715 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:59,715 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:43:59,715 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:43:59,715 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:43:59,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:43:59,743 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:43:59,822 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:43:59,822 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,822 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:43:59,823 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:43:59,823 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:43:59,823 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,823 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:43:59,828 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:43:59,828 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:43:59,841 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:59,845 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:59,850 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:59,856 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:43:59,858 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:43:59,861 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:43:59,892 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:43:59,892 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:43:59,973 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:43:59,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:43:59,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:43:59,997 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:43:59,998 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:44:00,010 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:00,020 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:00,033 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:00,056 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:00,074 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:00,079 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:00,088 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:44:00,088 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:00,123 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:44:00,125 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:00,125 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 00:44:00,125 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:00,126 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 00:44:00,126 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 00:44:00,126 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 00:44:00,126 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand 7 states. [2018-01-21 00:44:00,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:00,206 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-01-21 00:44:00,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:44:00,206 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 85 [2018-01-21 00:44:00,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:00,208 INFO L225 Difference]: With dead ends: 154 [2018-01-21 00:44:00,208 INFO L226 Difference]: Without dead ends: 126 [2018-01-21 00:44:00,209 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 00:44:00,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-21 00:44:00,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-21 00:44:00,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-21 00:44:00,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-01-21 00:44:00,222 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 85 [2018-01-21 00:44:00,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:00,223 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-01-21 00:44:00,223 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 00:44:00,223 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-01-21 00:44:00,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-01-21 00:44:00,226 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:00,226 INFO L322 BasicCegarLoop]: trace histogram [11, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:00,226 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:00,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1323929276, now seen corresponding path program 4 times [2018-01-21 00:44:00,226 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:00,227 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:00,227 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:00,227 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:00,227 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:00,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:00,256 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:00,412 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2018-01-21 00:44:00,412 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:00,412 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:00,413 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:00,413 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:00,413 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:00,413 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:00,426 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:44:00,427 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:44:00,467 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:00,470 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:00,540 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 00:44:00,540 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:00,685 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-21 00:44:00,719 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:00,719 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:00,726 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:44:00,726 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:44:00,777 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:00,782 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:00,797 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 00:44:00,797 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:00,966 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-21 00:44:00,968 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:00,968 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 00:44:00,968 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:00,969 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 00:44:00,969 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 00:44:00,969 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:44:00,969 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 14 states. [2018-01-21 00:44:01,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:01,197 INFO L93 Difference]: Finished difference Result 262 states and 293 transitions. [2018-01-21 00:44:01,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 00:44:01,197 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 108 [2018-01-21 00:44:01,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:01,199 INFO L225 Difference]: With dead ends: 262 [2018-01-21 00:44:01,199 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 00:44:01,200 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 412 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2018-01-21 00:44:01,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 00:44:01,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 131. [2018-01-21 00:44:01,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 00:44:01,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 00:44:01,211 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 108 [2018-01-21 00:44:01,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:01,212 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 00:44:01,212 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 00:44:01,212 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 00:44:01,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 00:44:01,214 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:01,214 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:01,214 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:01,214 INFO L82 PathProgramCache]: Analyzing trace with hash -481631070, now seen corresponding path program 5 times [2018-01-21 00:44:01,214 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:01,215 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:01,215 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:01,215 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:01,215 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:01,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:01,246 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:01,387 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 00:44:01,388 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:01,388 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:01,388 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:01,388 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:01,388 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:01,388 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:01,396 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:44:01,396 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:01,411 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,413 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,415 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,420 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,425 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,430 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,436 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,438 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:01,441 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:01,576 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 382 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-01-21 00:44:01,576 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:01,800 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 188 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2018-01-21 00:44:01,820 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:01,820 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:01,828 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:44:01,828 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:01,840 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,844 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,851 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,860 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,877 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:01,918 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:02,003 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:02,020 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:02,025 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:02,086 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 385 proven. 118 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-01-21 00:44:02,086 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:02,313 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 191 proven. 218 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-01-21 00:44:02,315 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:02,315 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13, 13, 13] total 28 [2018-01-21 00:44:02,315 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:02,316 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 00:44:02,316 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 00:44:02,316 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2018-01-21 00:44:02,317 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 19 states. [2018-01-21 00:44:02,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:02,790 INFO L93 Difference]: Finished difference Result 312 states and 349 transitions. [2018-01-21 00:44:02,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 00:44:02,791 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 146 [2018-01-21 00:44:02,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:02,793 INFO L225 Difference]: With dead ends: 312 [2018-01-21 00:44:02,793 INFO L226 Difference]: Without dead ends: 234 [2018-01-21 00:44:02,794 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 554 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 00:44:02,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-01-21 00:44:02,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 169. [2018-01-21 00:44:02,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-01-21 00:44:02,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 188 transitions. [2018-01-21 00:44:02,808 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 188 transitions. Word has length 146 [2018-01-21 00:44:02,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:02,809 INFO L432 AbstractCegarLoop]: Abstraction has 169 states and 188 transitions. [2018-01-21 00:44:02,809 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 00:44:02,809 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 188 transitions. [2018-01-21 00:44:02,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 00:44:02,811 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:02,811 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:02,811 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:02,811 INFO L82 PathProgramCache]: Analyzing trace with hash -75359012, now seen corresponding path program 6 times [2018-01-21 00:44:02,811 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:02,812 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:02,812 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:02,812 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:02,812 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:02,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:02,847 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:03,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 00:44:03,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:03,016 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:03,016 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:03,016 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:03,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:03,017 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:03,026 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:03,027 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:03,047 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,052 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,057 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,061 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,065 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,070 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,076 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,082 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,089 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,091 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:03,094 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:03,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 00:44:03,118 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:03,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 00:44:03,262 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:03,262 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:03,265 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:03,266 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:03,283 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,292 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,306 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,319 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,338 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,369 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,410 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,480 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,693 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:03,724 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:03,731 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:03,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 00:44:03,751 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:03,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 00:44:03,893 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:03,893 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 00:44:03,893 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:03,894 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 00:44:03,894 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 00:44:03,894 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:44:03,894 INFO L87 Difference]: Start difference. First operand 169 states and 188 transitions. Second operand 10 states. [2018-01-21 00:44:03,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:03,992 INFO L93 Difference]: Finished difference Result 267 states and 298 transitions. [2018-01-21 00:44:03,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 00:44:03,992 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 189 [2018-01-21 00:44:03,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:03,994 INFO L225 Difference]: With dead ends: 267 [2018-01-21 00:44:03,994 INFO L226 Difference]: Without dead ends: 224 [2018-01-21 00:44:03,995 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 748 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 00:44:03,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2018-01-21 00:44:04,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 181. [2018-01-21 00:44:04,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-21 00:44:04,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2018-01-21 00:44:04,008 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 189 [2018-01-21 00:44:04,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:04,009 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2018-01-21 00:44:04,009 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 00:44:04,009 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2018-01-21 00:44:04,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-01-21 00:44:04,012 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:04,013 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:04,013 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:04,013 INFO L82 PathProgramCache]: Analyzing trace with hash -520842402, now seen corresponding path program 7 times [2018-01-21 00:44:04,013 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:04,014 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:04,014 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:04,014 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:04,014 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:04,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:04,051 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:04,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-21 00:44:04,261 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:04,261 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:04,261 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:04,262 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:04,262 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:04,262 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:04,267 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:44:04,267 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:44:04,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:04,325 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:04,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-21 00:44:04,487 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:04,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-21 00:44:04,708 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:04,708 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:04,717 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:44:04,718 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:44:04,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:04,812 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:04,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-21 00:44:04,841 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:05,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-21 00:44:05,029 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:05,030 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 00:44:05,030 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:05,030 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 00:44:05,030 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 00:44:05,030 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 00:44:05,031 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand 21 states. [2018-01-21 00:44:05,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:05,427 INFO L93 Difference]: Finished difference Result 470 states and 526 transitions. [2018-01-21 00:44:05,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 00:44:05,427 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 222 [2018-01-21 00:44:05,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:05,429 INFO L225 Difference]: With dead ends: 470 [2018-01-21 00:44:05,430 INFO L226 Difference]: Without dead ends: 367 [2018-01-21 00:44:05,431 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 858 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 00:44:05,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-01-21 00:44:05,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 224. [2018-01-21 00:44:05,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2018-01-21 00:44:05,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 251 transitions. [2018-01-21 00:44:05,455 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 251 transitions. Word has length 222 [2018-01-21 00:44:05,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:05,456 INFO L432 AbstractCegarLoop]: Abstraction has 224 states and 251 transitions. [2018-01-21 00:44:05,456 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 00:44:05,456 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 251 transitions. [2018-01-21 00:44:05,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 00:44:05,459 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:05,459 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:05,459 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:05,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1579608284, now seen corresponding path program 8 times [2018-01-21 00:44:05,459 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:05,460 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:05,460 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:44:05,460 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:05,460 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:05,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:05,489 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:05,739 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 00:44:05,739 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:05,739 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:05,739 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:05,739 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:05,739 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:05,739 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:05,746 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:44:05,746 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:05,765 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:05,808 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:05,816 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:05,824 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:06,020 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-21 00:44:06,020 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:06,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-21 00:44:06,297 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:06,297 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:06,300 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:44:06,300 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:06,322 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:06,372 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:06,412 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:06,422 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:06,484 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-21 00:44:06,484 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:06,705 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-21 00:44:06,707 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:06,707 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 00:44:06,707 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:06,708 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 00:44:06,708 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 00:44:06,709 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 00:44:06,709 INFO L87 Difference]: Start difference. First operand 224 states and 251 transitions. Second operand 24 states. [2018-01-21 00:44:07,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:07,310 INFO L93 Difference]: Finished difference Result 579 states and 648 transitions. [2018-01-21 00:44:07,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 00:44:07,310 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 275 [2018-01-21 00:44:07,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:07,313 INFO L225 Difference]: With dead ends: 579 [2018-01-21 00:44:07,313 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 00:44:07,314 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 1065 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 00:44:07,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 00:44:07,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 272. [2018-01-21 00:44:07,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-01-21 00:44:07,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 306 transitions. [2018-01-21 00:44:07,330 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 306 transitions. Word has length 275 [2018-01-21 00:44:07,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:07,331 INFO L432 AbstractCegarLoop]: Abstraction has 272 states and 306 transitions. [2018-01-21 00:44:07,331 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 00:44:07,331 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 306 transitions. [2018-01-21 00:44:07,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 00:44:07,332 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:07,333 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:07,333 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:07,333 INFO L82 PathProgramCache]: Analyzing trace with hash -1321832962, now seen corresponding path program 9 times [2018-01-21 00:44:07,333 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:07,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:07,334 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:07,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:07,334 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:07,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:07,367 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:07,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 00:44:07,648 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:07,648 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:07,648 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:07,649 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:07,649 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:07,649 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:07,654 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:44:07,654 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:44:07,676 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,679 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,682 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,687 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,692 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,699 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,704 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,710 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:07,711 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:07,715 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:07,886 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 00:44:07,886 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:08,260 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 00:44:08,280 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:08,281 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:08,283 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:44:08,284 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:44:08,323 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,338 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,360 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,392 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,432 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,507 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,633 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,930 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:44:08,971 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:08,982 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:09,080 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 00:44:09,081 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:09,441 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 00:44:09,444 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:09,444 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 00:44:09,444 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:09,445 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 00:44:09,445 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 00:44:09,445 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 00:44:09,445 INFO L87 Difference]: Start difference. First operand 272 states and 306 transitions. Second operand 20 states. [2018-01-21 00:44:10,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:10,022 INFO L93 Difference]: Finished difference Result 669 states and 759 transitions. [2018-01-21 00:44:10,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 00:44:10,022 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 333 [2018-01-21 00:44:10,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:10,025 INFO L225 Difference]: With dead ends: 669 [2018-01-21 00:44:10,026 INFO L226 Difference]: Without dead ends: 611 [2018-01-21 00:44:10,027 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1349 GetRequests, 1312 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 00:44:10,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2018-01-21 00:44:10,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 333. [2018-01-21 00:44:10,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2018-01-21 00:44:10,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 380 transitions. [2018-01-21 00:44:10,047 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 380 transitions. Word has length 333 [2018-01-21 00:44:10,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:10,048 INFO L432 AbstractCegarLoop]: Abstraction has 333 states and 380 transitions. [2018-01-21 00:44:10,048 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 00:44:10,048 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 380 transitions. [2018-01-21 00:44:10,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-01-21 00:44:10,050 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:10,050 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:10,050 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:10,051 INFO L82 PathProgramCache]: Analyzing trace with hash -626287868, now seen corresponding path program 10 times [2018-01-21 00:44:10,051 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:10,051 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:10,051 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:10,052 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:10,052 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:10,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:10,087 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:10,507 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-21 00:44:10,508 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:10,508 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:10,508 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:10,508 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:10,508 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:10,508 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:10,513 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:44:10,513 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:44:10,610 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:10,619 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:10,878 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-21 00:44:10,879 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:11,260 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-21 00:44:11,280 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:11,280 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:11,283 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:44:11,283 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:44:11,414 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:11,424 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:11,491 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-21 00:44:11,491 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:11,745 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-21 00:44:11,747 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:11,747 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 00:44:11,747 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:11,748 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 00:44:11,749 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 00:44:11,749 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 00:44:11,749 INFO L87 Difference]: Start difference. First operand 333 states and 380 transitions. Second operand 30 states. [2018-01-21 00:44:12,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:12,782 INFO L93 Difference]: Finished difference Result 877 states and 999 transitions. [2018-01-21 00:44:12,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 00:44:12,782 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 396 [2018-01-21 00:44:12,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:12,786 INFO L225 Difference]: With dead ends: 877 [2018-01-21 00:44:12,786 INFO L226 Difference]: Without dead ends: 721 [2018-01-21 00:44:12,788 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1613 GetRequests, 1539 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 00:44:12,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2018-01-21 00:44:12,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 391. [2018-01-21 00:44:12,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2018-01-21 00:44:12,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 444 transitions. [2018-01-21 00:44:12,811 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 444 transitions. Word has length 396 [2018-01-21 00:44:12,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:12,811 INFO L432 AbstractCegarLoop]: Abstraction has 391 states and 444 transitions. [2018-01-21 00:44:12,811 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 00:44:12,811 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 444 transitions. [2018-01-21 00:44:12,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2018-01-21 00:44:12,814 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:12,814 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:44:12,814 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:12,814 INFO L82 PathProgramCache]: Analyzing trace with hash 91735614, now seen corresponding path program 11 times [2018-01-21 00:44:12,814 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:12,815 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:12,815 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:12,815 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:12,815 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:12,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:12,853 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:13,525 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-21 00:44:13,526 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:13,526 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:13,526 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:13,526 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:13,526 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:13,526 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:44:13,535 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:44:13,535 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:13,563 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,576 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,587 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,596 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,607 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,619 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,636 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,651 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:13,654 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:13,660 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:13,979 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-21 00:44:13,980 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:14,533 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-21 00:44:14,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:14,555 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:44:14,560 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:44:14,561 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:44:14,594 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:14,605 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:14,628 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:14,669 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:14,762 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:16,309 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:20,924 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:21,259 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:44:21,307 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:21,316 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:21,419 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-21 00:44:21,419 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:21,758 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-21 00:44:21,760 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:44:21,761 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 40 [2018-01-21 00:44:21,761 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:44:21,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 00:44:21,762 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 00:44:21,762 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1318, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 00:44:21,763 INFO L87 Difference]: Start difference. First operand 391 states and 444 transitions. Second operand 31 states. [2018-01-21 00:44:23,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:44:23,891 INFO L93 Difference]: Finished difference Result 966 states and 1091 transitions. [2018-01-21 00:44:23,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 00:44:23,892 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 459 [2018-01-21 00:44:23,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:44:23,894 INFO L225 Difference]: With dead ends: 966 [2018-01-21 00:44:23,894 INFO L226 Difference]: Without dead ends: 554 [2018-01-21 00:44:23,897 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1888 GetRequests, 1801 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 00:44:23,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2018-01-21 00:44:23,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 395. [2018-01-21 00:44:23,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2018-01-21 00:44:23,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 440 transitions. [2018-01-21 00:44:23,916 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 440 transitions. Word has length 459 [2018-01-21 00:44:23,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:44:23,917 INFO L432 AbstractCegarLoop]: Abstraction has 395 states and 440 transitions. [2018-01-21 00:44:23,917 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 00:44:23,917 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 440 transitions. [2018-01-21 00:44:23,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2018-01-21 00:44:23,920 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:44:23,921 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 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, 1] [2018-01-21 00:44:23,921 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:44:23,921 INFO L82 PathProgramCache]: Analyzing trace with hash 1309279644, now seen corresponding path program 12 times [2018-01-21 00:44:23,921 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:44:23,922 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:23,922 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:44:23,922 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:44:23,922 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:44:23,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:44:23,963 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:44:24,822 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-21 00:44:24,822 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:24,822 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:44:24,822 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:44:24,823 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:44:24,823 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:24,823 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 [2018-01-21 00:44:24,829 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:24,830 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:24,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,873 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,879 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,884 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,891 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,900 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,909 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,924 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,939 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,968 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,983 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:24,996 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,014 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,030 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,081 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,108 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,154 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,156 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:44:25,164 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:44:25,396 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-21 00:44:25,396 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:44:25,896 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-21 00:44:25,917 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:44:25,917 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 [2018-01-21 00:44:25,920 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:44:25,920 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:44:25,959 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,969 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:25,995 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:26,035 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:31,875 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:44:43,907 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 00:44:55,944 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown