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/memsafety/960521-1_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 00:34:22,191 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 00:34:22,193 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 00:34:22,207 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 00:34:22,208 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 00:34:22,209 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 00:34:22,210 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 00:34:22,211 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 00:34:22,213 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 00:34:22,214 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 00:34:22,215 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-01-21 00:34:22,234 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 00:34:22,242 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 00:34:22,242 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 00:34:22,243 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 00:34:22,243 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 00:34:22,243 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 00:34:22,243 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-21 00:34:22,243 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 00:34:22,244 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 00:34:22,244 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 00:34:22,244 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 00:34:22,244 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 00:34:22,244 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 00:34:22,244 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 00:34:22,245 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 00:34:22,246 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 00:34:22,246 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 00:34:22,246 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 00:34:22,246 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 00:34:22,246 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 00:34:22,247 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 00:34:22,247 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 00:34:22,248 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 00:34:22,248 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 00:34:22,248 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 00:34:22,248 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 00:34:22,279 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 00:34:22,288 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 00:34:22,292 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 00:34:22,293 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 00:34:22,293 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 00:34:22,294 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/memsafety/960521-1_true-valid-memsafety.i [2018-01-21 00:34:22,433 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 00:34:22,437 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 00:34:22,438 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 00:34:22,439 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 00:34:22,446 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 00:34:22,447 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,451 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3adf5c24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22, skipping insertion in model container [2018-01-21 00:34:22,451 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,469 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:34:22,505 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 00:34:22,608 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:34:22,622 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 00:34:22,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22 WrapperNode [2018-01-21 00:34:22,628 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 00:34:22,629 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 00:34:22,629 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 00:34:22,629 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 00:34:22,639 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,639 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,648 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,648 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,651 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,653 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,654 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (1/1) ... [2018-01-21 00:34:22,656 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 00:34:22,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 00:34:22,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 00:34:22,656 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 00:34:22,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (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 00:34:22,704 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 00:34:22,704 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 00:34:22,704 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 00:34:22,705 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 00:34:22,705 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 00:34:22,706 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 00:34:22,706 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 00:34:22,860 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 00:34:22,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:34:22 BoogieIcfgContainer [2018-01-21 00:34:22,861 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 00:34:22,862 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 00:34:22,862 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 00:34:22,864 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 00:34:22,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 12:34:22" (1/3) ... [2018-01-21 00:34:22,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232396f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:34:22, skipping insertion in model container [2018-01-21 00:34:22,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 12:34:22" (2/3) ... [2018-01-21 00:34:22,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@232396f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 12:34:22, skipping insertion in model container [2018-01-21 00:34:22,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 12:34:22" (3/3) ... [2018-01-21 00:34:22,867 INFO L105 eAbstractionObserver]: Analyzing ICFG 960521-1_true-valid-memsafety.i [2018-01-21 00:34:22,873 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 00:34:22,878 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 00:34:22,919 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:34:22,919 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:34:22,919 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:34:22,919 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:34:22,919 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:34:22,920 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:34:22,920 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:34:22,920 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 00:34:22,920 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:34:22,941 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-01-21 00:34:22,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 00:34:22,948 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:22,949 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 00:34:22,949 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 00:34:22,954 INFO L82 PathProgramCache]: Analyzing trace with hash 90336, now seen corresponding path program 1 times [2018-01-21 00:34:22,957 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,002 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,003 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,003 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,003 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:34:23,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 00:34:23,069 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 00:34:23,077 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 00:34:23,085 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:34:23,085 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:34:23,086 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:34:23,086 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:34:23,086 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:34:23,086 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:34:23,086 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:34:23,086 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 00:34:23,086 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:34:23,087 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-01-21 00:34:23,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 00:34:23,088 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:23,088 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:23,088 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 00:34:23,089 INFO L82 PathProgramCache]: Analyzing trace with hash 935443697, now seen corresponding path program 1 times [2018-01-21 00:34:23,089 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,090 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,090 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,090 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,090 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:23,122 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:23,167 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 00:34:23,168 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:34:23,169 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:34:23,169 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:34:23,171 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:34:23,184 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:34:23,185 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:34:23,188 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2018-01-21 00:34:23,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:23,214 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2018-01-21 00:34:23,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:34:23,278 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2018-01-21 00:34:23,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:23,288 INFO L225 Difference]: With dead ends: 60 [2018-01-21 00:34:23,288 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 00:34:23,291 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 00:34:23,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 00:34:23,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 00:34:23,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 00:34:23,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 00:34:23,311 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 18 [2018-01-21 00:34:23,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:23,312 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 00:34:23,312 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:34:23,312 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 00:34:23,312 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 00:34:23,314 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 00:34:23,314 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 00:34:23,314 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 00:34:23,314 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 00:34:23,315 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 00:34:23,315 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 00:34:23,315 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 00:34:23,315 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 00:34:23,315 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 00:34:23,316 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2018-01-21 00:34:23,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 00:34:23,317 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:23,317 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:23,317 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:23,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1172106943, now seen corresponding path program 1 times [2018-01-21 00:34:23,318 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,319 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,319 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,319 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,319 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:23,335 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:23,359 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 00:34:23,360 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:34:23,360 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 00:34:23,360 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:34:23,360 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 00:34:23,361 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 00:34:23,361 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 00:34:23,361 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 2 states. [2018-01-21 00:34:23,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:23,366 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2018-01-21 00:34:23,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 00:34:23,366 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 27 [2018-01-21 00:34:23,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:23,369 INFO L225 Difference]: With dead ends: 60 [2018-01-21 00:34:23,369 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 00:34:23,369 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 00:34:23,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 00:34:23,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 00:34:23,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 00:34:23,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-01-21 00:34:23,378 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 27 [2018-01-21 00:34:23,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:23,379 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-01-21 00:34:23,379 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 00:34:23,379 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-01-21 00:34:23,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 00:34:23,380 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:23,380 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:23,380 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:23,380 INFO L82 PathProgramCache]: Analyzing trace with hash -862637837, now seen corresponding path program 1 times [2018-01-21 00:34:23,380 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,381 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,381 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,381 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,381 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:23,400 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:23,484 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 00:34:23,484 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:34:23,484 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 00:34:23,485 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:34:23,486 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 00:34:23,487 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 00:34:23,487 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 00:34:23,487 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 3 states. [2018-01-21 00:34:23,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:23,544 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2018-01-21 00:34:23,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 00:34:23,544 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2018-01-21 00:34:23,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:23,546 INFO L225 Difference]: With dead ends: 58 [2018-01-21 00:34:23,546 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 00:34:23,547 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 00:34:23,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 00:34:23,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 38. [2018-01-21 00:34:23,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 00:34:23,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 00:34:23,552 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 29 [2018-01-21 00:34:23,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:23,553 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 00:34:23,553 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 00:34:23,553 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 00:34:23,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 00:34:23,554 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:23,555 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:23,555 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:23,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1162981958, now seen corresponding path program 1 times [2018-01-21 00:34:23,555 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,556 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,556 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,556 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,557 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:23,576 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:23,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:34:23,649 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:34:23,649 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 00:34:23,649 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:34:23,650 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:34:23,650 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:34:23,650 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-21 00:34:23,651 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 5 states. [2018-01-21 00:34:23,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:23,718 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2018-01-21 00:34:23,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:34:23,718 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 33 [2018-01-21 00:34:23,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:23,720 INFO L225 Difference]: With dead ends: 43 [2018-01-21 00:34:23,720 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 00:34:23,720 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-01-21 00:34:23,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 00:34:23,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 00:34:23,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 00:34:23,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-01-21 00:34:23,726 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2018-01-21 00:34:23,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:23,726 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-01-21 00:34:23,726 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:34:23,727 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-01-21 00:34:23,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 00:34:23,727 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:23,728 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:23,728 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:23,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1789723842, now seen corresponding path program 1 times [2018-01-21 00:34:23,728 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,729 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,729 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,730 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:23,746 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:23,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 00:34:23,796 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 00:34:23,797 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 00:34:23,797 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 00:34:23,797 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 00:34:23,797 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 00:34:23,797 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-01-21 00:34:23,798 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 5 states. [2018-01-21 00:34:23,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:23,882 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2018-01-21 00:34:23,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 00:34:23,904 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 33 [2018-01-21 00:34:23,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:23,905 INFO L225 Difference]: With dead ends: 60 [2018-01-21 00:34:23,905 INFO L226 Difference]: Without dead ends: 42 [2018-01-21 00:34:23,905 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-01-21 00:34:23,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-21 00:34:23,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2018-01-21 00:34:23,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 00:34:23,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2018-01-21 00:34:23,910 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 33 [2018-01-21 00:34:23,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:23,910 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2018-01-21 00:34:23,910 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 00:34:23,910 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2018-01-21 00:34:23,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 00:34:23,911 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:23,911 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] [2018-01-21 00:34:23,911 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:23,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1424676713, now seen corresponding path program 1 times [2018-01-21 00:34:23,912 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:23,912 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,912 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:23,913 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:23,913 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:23,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:23,930 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:23,975 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 00:34:23,975 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:23,975 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:23,976 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 38 with the following transitions: [2018-01-21 00:34:23,979 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [15], [19], [23], [26], [28], [29], [31], [35], [40], [41], [42], [43], [44], [45], [46], [47], [49], [56], [57], [58], [60], [61], [63], [64], [65], [66], [67], [68] [2018-01-21 00:34:24,025 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 00:34:24,026 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 00:34:24,305 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 00:34:24,307 INFO L268 AbstractInterpreter]: Visited 35 different actions 52 times. Merged at 15 different actions 15 times. Never widened. Found 4 fixpoints after 4 different actions. Largest state had 28 variables. [2018-01-21 00:34:24,318 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 00:34:24,318 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:24,318 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 00:34:24,330 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:24,331 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:34:24,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:24,373 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:24,420 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 00:34:24,421 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:24,557 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 00:34:24,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:24,589 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:24,592 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:24,593 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:34:24,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:24,636 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:24,671 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 00:34:24,671 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:24,725 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 00:34:24,726 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:24,726 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6, 4, 4] total 14 [2018-01-21 00:34:24,726 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:24,727 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 00:34:24,727 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 00:34:24,727 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2018-01-21 00:34:24,727 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 8 states. [2018-01-21 00:34:24,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:24,862 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2018-01-21 00:34:24,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 00:34:24,863 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 37 [2018-01-21 00:34:24,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:24,864 INFO L225 Difference]: With dead ends: 68 [2018-01-21 00:34:24,864 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 00:34:24,864 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2018-01-21 00:34:24,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 00:34:24,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 46. [2018-01-21 00:34:24,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 00:34:24,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-01-21 00:34:24,870 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 37 [2018-01-21 00:34:24,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:24,870 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-01-21 00:34:24,870 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 00:34:24,870 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-01-21 00:34:24,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 00:34:24,871 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:24,871 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:24,872 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:24,872 INFO L82 PathProgramCache]: Analyzing trace with hash 256637367, now seen corresponding path program 2 times [2018-01-21 00:34:24,872 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:24,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:24,873 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:24,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:24,873 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:24,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:24,894 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:25,015 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 00:34:25,015 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:25,015 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:25,016 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:25,016 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:25,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:25,016 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:25,029 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:34:25,030 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:25,051 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:25,058 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:25,059 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:25,062 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:25,136 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 00:34:25,136 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:25,301 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 00:34:25,322 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:25,322 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:25,332 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:34:25,332 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:25,364 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:25,408 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:25,420 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:25,425 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:25,447 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 00:34:25,447 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:25,490 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 00:34:25,491 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:25,491 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7, 5, 5] total 18 [2018-01-21 00:34:25,492 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:25,492 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 00:34:25,492 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 00:34:25,492 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=203, Unknown=0, NotChecked=0, Total=306 [2018-01-21 00:34:25,492 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 10 states. [2018-01-21 00:34:25,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:25,592 INFO L93 Difference]: Finished difference Result 80 states and 83 transitions. [2018-01-21 00:34:25,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 00:34:25,592 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 45 [2018-01-21 00:34:25,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:25,594 INFO L225 Difference]: With dead ends: 80 [2018-01-21 00:34:25,594 INFO L226 Difference]: Without dead ends: 58 [2018-01-21 00:34:25,594 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 167 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:34:25,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-01-21 00:34:25,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-01-21 00:34:25,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-21 00:34:25,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-01-21 00:34:25,601 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 45 [2018-01-21 00:34:25,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:25,602 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-01-21 00:34:25,602 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 00:34:25,602 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-01-21 00:34:25,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-21 00:34:25,603 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:25,604 INFO L322 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:25,604 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:25,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1564201431, now seen corresponding path program 3 times [2018-01-21 00:34:25,604 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:25,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:25,605 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:25,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:25,605 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:25,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:25,624 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:25,736 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 00:34:25,736 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:25,736 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:25,736 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:25,737 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:25,737 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:25,737 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:25,745 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:34:25,746 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:34:25,764 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:25,768 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:25,771 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:25,781 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:25,782 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:25,785 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:25,869 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-01-21 00:34:25,869 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:25,986 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 00:34:26,008 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:26,008 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:26,011 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:34:26,011 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:34:26,035 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:26,073 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:26,117 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:26,165 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:26,178 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:26,184 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:26,205 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 00:34:26,205 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:26,224 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 00:34:26,226 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:26,226 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 6, 6, 6] total 20 [2018-01-21 00:34:26,226 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:26,227 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 00:34:26,227 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 00:34:26,227 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-01-21 00:34:26,228 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 15 states. [2018-01-21 00:34:26,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:26,333 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2018-01-21 00:34:26,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 00:34:26,334 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2018-01-21 00:34:26,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:26,337 INFO L225 Difference]: With dead ends: 98 [2018-01-21 00:34:26,338 INFO L226 Difference]: Without dead ends: 72 [2018-01-21 00:34:26,339 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=146, Invalid=274, Unknown=0, NotChecked=0, Total=420 [2018-01-21 00:34:26,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-01-21 00:34:26,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2018-01-21 00:34:26,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-01-21 00:34:26,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-01-21 00:34:26,347 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 53 [2018-01-21 00:34:26,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:26,347 INFO L432 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-01-21 00:34:26,347 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 00:34:26,347 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-01-21 00:34:26,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-01-21 00:34:26,348 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:26,348 INFO L322 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 4, 4, 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 00:34:26,349 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:26,349 INFO L82 PathProgramCache]: Analyzing trace with hash -785035568, now seen corresponding path program 4 times [2018-01-21 00:34:26,349 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:26,349 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:26,349 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:26,350 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:26,350 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:26,368 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:26,485 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 00:34:26,486 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:26,486 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:26,486 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:26,486 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:26,486 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:26,486 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:26,497 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:34:26,497 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:34:26,543 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:26,547 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:26,622 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 00:34:26,622 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:26,907 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 00:34:26,929 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:26,929 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:26,934 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:34:26,935 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:34:27,033 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:27,039 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:27,051 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 00:34:27,051 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:27,161 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-01-21 00:34:27,163 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:27,163 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 10, 9, 10] total 23 [2018-01-21 00:34:27,163 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:27,163 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 00:34:27,164 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 00:34:27,164 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2018-01-21 00:34:27,164 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 16 states. [2018-01-21 00:34:27,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:27,279 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2018-01-21 00:34:27,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 00:34:27,279 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 65 [2018-01-21 00:34:27,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:27,280 INFO L225 Difference]: With dead ends: 112 [2018-01-21 00:34:27,280 INFO L226 Difference]: Without dead ends: 82 [2018-01-21 00:34:27,280 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 243 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=206, Invalid=346, Unknown=0, NotChecked=0, Total=552 [2018-01-21 00:34:27,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-01-21 00:34:27,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-01-21 00:34:27,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 00:34:27,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-01-21 00:34:27,288 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 65 [2018-01-21 00:34:27,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:27,289 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-01-21 00:34:27,289 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 00:34:27,289 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-01-21 00:34:27,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-01-21 00:34:27,290 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:27,291 INFO L322 BasicCegarLoop]: trace histogram [7, 7, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:27,291 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:27,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1765243849, now seen corresponding path program 5 times [2018-01-21 00:34:27,291 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:27,292 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:27,292 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:27,292 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:27,292 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:27,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:27,307 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:27,421 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 00:34:27,421 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:27,421 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:27,421 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:27,422 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:27,422 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:27,422 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:27,430 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:34:27,431 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:27,440 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,448 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,453 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,457 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,467 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,485 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,534 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,536 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:27,539 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:27,557 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 00:34:27,557 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:27,655 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 00:34:27,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:27,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:27,680 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:34:27,681 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:27,689 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,692 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,699 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,710 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,733 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,764 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,848 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:27,868 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:27,873 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:27,880 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 00:34:27,881 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:27,909 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2018-01-21 00:34:27,911 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:27,912 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9, 9, 9] total 19 [2018-01-21 00:34:27,912 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:27,912 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 00:34:27,913 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 00:34:27,913 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2018-01-21 00:34:27,913 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 12 states. [2018-01-21 00:34:28,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:28,061 INFO L93 Difference]: Finished difference Result 128 states and 131 transitions. [2018-01-21 00:34:28,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 00:34:28,062 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 77 [2018-01-21 00:34:28,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:28,063 INFO L225 Difference]: With dead ends: 128 [2018-01-21 00:34:28,063 INFO L226 Difference]: Without dead ends: 90 [2018-01-21 00:34:28,064 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=260, Invalid=390, Unknown=0, NotChecked=0, Total=650 [2018-01-21 00:34:28,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-01-21 00:34:28,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 86. [2018-01-21 00:34:28,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 00:34:28,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2018-01-21 00:34:28,073 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 77 [2018-01-21 00:34:28,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:28,073 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2018-01-21 00:34:28,073 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 00:34:28,073 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2018-01-21 00:34:28,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 00:34:28,074 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:28,075 INFO L322 BasicCegarLoop]: trace histogram [8, 8, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:28,075 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:28,075 INFO L82 PathProgramCache]: Analyzing trace with hash -29132713, now seen corresponding path program 6 times [2018-01-21 00:34:28,075 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:28,076 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:28,076 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:28,076 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:28,076 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:28,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:28,095 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:28,193 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:34:28,193 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:28,193 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:28,193 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:28,193 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:28,193 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:28,193 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:28,198 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:34:28,198 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:34:28,212 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,215 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,217 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,220 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,237 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,250 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,334 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,335 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:28,338 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:28,362 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:34:28,362 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:28,484 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:34:28,506 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:28,506 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:28,512 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:34:28,513 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:34:28,533 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,569 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,609 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,663 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,728 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,798 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:28,913 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:29,039 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:29,057 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:29,063 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:29,072 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:34:29,072 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:29,100 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 00:34:29,103 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:29,103 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10, 10, 10] total 21 [2018-01-21 00:34:29,103 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:29,103 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 00:34:29,104 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 00:34:29,104 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2018-01-21 00:34:29,104 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand 13 states. [2018-01-21 00:34:29,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:29,228 INFO L93 Difference]: Finished difference Result 140 states and 143 transitions. [2018-01-21 00:34:29,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 00:34:29,228 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-21 00:34:29,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:29,229 INFO L225 Difference]: With dead ends: 140 [2018-01-21 00:34:29,229 INFO L226 Difference]: Without dead ends: 98 [2018-01-21 00:34:29,230 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=328, Invalid=484, Unknown=0, NotChecked=0, Total=812 [2018-01-21 00:34:29,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-01-21 00:34:29,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 94. [2018-01-21 00:34:29,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-01-21 00:34:29,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-01-21 00:34:29,241 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 85 [2018-01-21 00:34:29,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:29,242 INFO L432 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-01-21 00:34:29,242 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 00:34:29,242 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-01-21 00:34:29,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-21 00:34:29,243 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:29,244 INFO L322 BasicCegarLoop]: trace histogram [9, 9, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:29,244 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:29,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1240796297, now seen corresponding path program 7 times [2018-01-21 00:34:29,244 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:29,245 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:29,245 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:29,245 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:29,245 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:29,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:29,265 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:29,422 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2018-01-21 00:34:29,422 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:29,422 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:29,423 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:29,423 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:29,423 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:29,423 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:29,430 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:29,430 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:34:29,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:29,457 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:29,549 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2018-01-21 00:34:29,549 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:29,793 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2018-01-21 00:34:29,813 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:29,813 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:29,816 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:29,816 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:34:29,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:29,864 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:29,881 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2018-01-21 00:34:29,881 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:30,024 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2018-01-21 00:34:30,026 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:30,026 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13, 12, 13] total 32 [2018-01-21 00:34:30,026 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:30,026 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 00:34:30,026 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 00:34:30,027 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-01-21 00:34:30,027 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 22 states. [2018-01-21 00:34:30,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:30,189 INFO L93 Difference]: Finished difference Result 152 states and 155 transitions. [2018-01-21 00:34:30,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 00:34:30,190 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 93 [2018-01-21 00:34:30,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:30,191 INFO L225 Difference]: With dead ends: 152 [2018-01-21 00:34:30,191 INFO L226 Difference]: Without dead ends: 106 [2018-01-21 00:34:30,191 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 349 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=398, Invalid=658, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 00:34:30,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-01-21 00:34:30,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2018-01-21 00:34:30,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-01-21 00:34:30,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-01-21 00:34:30,200 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 93 [2018-01-21 00:34:30,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:30,200 INFO L432 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-01-21 00:34:30,200 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 00:34:30,200 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-01-21 00:34:30,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-01-21 00:34:30,202 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:30,202 INFO L322 BasicCegarLoop]: trace histogram [10, 10, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:30,202 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:30,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1325632105, now seen corresponding path program 8 times [2018-01-21 00:34:30,202 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:30,203 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:30,203 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:30,204 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:30,204 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:30,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:30,221 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:30,386 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 00:34:30,386 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:30,386 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:30,386 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:30,387 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:30,387 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:30,387 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:30,392 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:34:30,392 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:30,406 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:30,414 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:30,417 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:30,421 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:30,515 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 00:34:30,516 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:30,793 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 00:34:30,814 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:30,814 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:30,817 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:34:30,818 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:30,839 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:30,884 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:30,902 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:30,907 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:30,920 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 00:34:30,921 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:31,046 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2018-01-21 00:34:31,047 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:31,048 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14, 13, 14] total 35 [2018-01-21 00:34:31,048 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:31,048 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 00:34:31,048 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 00:34:31,049 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=748, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 00:34:31,049 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 24 states. [2018-01-21 00:34:31,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:31,176 INFO L93 Difference]: Finished difference Result 164 states and 167 transitions. [2018-01-21 00:34:31,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 00:34:31,176 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 101 [2018-01-21 00:34:31,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:31,177 INFO L225 Difference]: With dead ends: 164 [2018-01-21 00:34:31,177 INFO L226 Difference]: Without dead ends: 114 [2018-01-21 00:34:31,178 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 379 SyntacticMatches, 4 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=476, Invalid=784, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 00:34:31,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-21 00:34:31,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2018-01-21 00:34:31,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-01-21 00:34:31,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2018-01-21 00:34:31,187 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 101 [2018-01-21 00:34:31,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:31,187 INFO L432 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2018-01-21 00:34:31,187 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 00:34:31,187 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2018-01-21 00:34:31,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-01-21 00:34:31,188 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:31,188 INFO L322 BasicCegarLoop]: trace histogram [11, 11, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:31,188 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:31,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1372225865, now seen corresponding path program 9 times [2018-01-21 00:34:31,188 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:31,189 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:31,189 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:31,189 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:31,189 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:31,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:31,202 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:31,320 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 00:34:31,320 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:31,320 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:31,321 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:31,321 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:31,321 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:31,321 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:31,326 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:34:31,326 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:34:31,339 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,342 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,344 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,347 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,351 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,361 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,368 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,400 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,455 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,545 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,546 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:31,548 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:31,563 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 00:34:31,563 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:31,719 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 00:34:31,740 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:31,740 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:31,743 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:34:31,743 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:34:31,765 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,800 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,842 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,890 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:31,963 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:32,059 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:32,177 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:32,322 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:32,498 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:32,731 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:33,047 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:33,071 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:33,077 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:33,087 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 00:34:33,087 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:33,134 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-01-21 00:34:33,136 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:33,137 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13, 13, 13] total 27 [2018-01-21 00:34:33,137 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:33,137 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 00:34:33,137 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 00:34:33,137 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=398, Unknown=0, NotChecked=0, Total=702 [2018-01-21 00:34:33,138 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand 16 states. [2018-01-21 00:34:33,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:33,354 INFO L93 Difference]: Finished difference Result 176 states and 179 transitions. [2018-01-21 00:34:33,355 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 00:34:33,355 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2018-01-21 00:34:33,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:33,355 INFO L225 Difference]: With dead ends: 176 [2018-01-21 00:34:33,356 INFO L226 Difference]: Without dead ends: 122 [2018-01-21 00:34:33,356 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=580, Invalid=826, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 00:34:33,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-01-21 00:34:33,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 118. [2018-01-21 00:34:33,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-01-21 00:34:33,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-01-21 00:34:33,362 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 109 [2018-01-21 00:34:33,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:33,362 INFO L432 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-01-21 00:34:33,363 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 00:34:33,363 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-01-21 00:34:33,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-01-21 00:34:33,363 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:33,363 INFO L322 BasicCegarLoop]: trace histogram [12, 12, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:33,363 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:33,363 INFO L82 PathProgramCache]: Analyzing trace with hash 420712151, now seen corresponding path program 10 times [2018-01-21 00:34:33,364 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:33,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:33,364 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:33,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:33,364 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:33,382 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:33,556 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 00:34:33,556 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:33,556 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:33,557 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:33,557 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:33,557 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:33,557 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:33,562 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:34:33,562 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:34:33,730 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:33,733 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:33,863 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 00:34:33,863 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:34,199 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 00:34:34,220 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:34,220 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:34,223 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:34:34,224 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:34:34,377 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:34,382 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:34,405 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 00:34:34,405 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:34,567 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2018-01-21 00:34:34,569 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:34,569 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16, 15, 16] total 41 [2018-01-21 00:34:34,569 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:34,570 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 00:34:34,570 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 00:34:34,570 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=613, Invalid=1027, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 00:34:34,570 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 28 states. [2018-01-21 00:34:34,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:34,719 INFO L93 Difference]: Finished difference Result 188 states and 191 transitions. [2018-01-21 00:34:34,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 00:34:34,719 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 117 [2018-01-21 00:34:34,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:34,720 INFO L225 Difference]: With dead ends: 188 [2018-01-21 00:34:34,720 INFO L226 Difference]: Without dead ends: 130 [2018-01-21 00:34:34,720 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 439 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=653, Invalid=1069, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 00:34:34,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-01-21 00:34:34,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2018-01-21 00:34:34,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-01-21 00:34:34,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2018-01-21 00:34:34,727 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 117 [2018-01-21 00:34:34,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:34,728 INFO L432 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2018-01-21 00:34:34,728 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 00:34:34,728 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2018-01-21 00:34:34,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-01-21 00:34:34,729 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:34,729 INFO L322 BasicCegarLoop]: trace histogram [13, 13, 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, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 00:34:34,729 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:34,730 INFO L82 PathProgramCache]: Analyzing trace with hash -382458377, now seen corresponding path program 11 times [2018-01-21 00:34:34,730 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:34,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:34,731 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:34,731 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:34,731 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:34,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:34,745 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:34,910 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 00:34:34,910 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:34,910 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:34,910 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:34,910 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:34,910 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:34,911 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:34,917 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:34:34,918 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:34,928 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:34,930 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:34,933 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:34,939 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:34,947 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:34,983 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:34,998 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:35,024 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:35,081 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:35,309 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:35,438 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:36,116 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,105 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,113 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:39,144 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:39,174 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 00:34:39,174 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 00:34:39,383 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:39,383 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:39,386 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:34:39,386 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:39,396 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,400 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,409 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,420 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,438 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,464 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,530 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,620 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,742 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:39,907 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:40,461 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:41,225 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:42,294 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:42,341 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:42,348 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:42,360 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 00:34:42,361 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:42,396 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 00:34:42,399 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:42,399 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15, 15, 15] total 31 [2018-01-21 00:34:42,399 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:42,399 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 00:34:42,400 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 00:34:42,400 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=520, Unknown=0, NotChecked=0, Total=930 [2018-01-21 00:34:42,400 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand 18 states. [2018-01-21 00:34:42,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:42,616 INFO L93 Difference]: Finished difference Result 200 states and 203 transitions. [2018-01-21 00:34:42,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 00:34:42,616 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 125 [2018-01-21 00:34:42,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:42,617 INFO L225 Difference]: With dead ends: 200 [2018-01-21 00:34:42,617 INFO L226 Difference]: Without dead ends: 138 [2018-01-21 00:34:42,618 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 499 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=788, Invalid=1104, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 00:34:42,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-01-21 00:34:42,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 134. [2018-01-21 00:34:42,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-01-21 00:34:42,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 135 transitions. [2018-01-21 00:34:42,623 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 135 transitions. Word has length 125 [2018-01-21 00:34:42,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:42,624 INFO L432 AbstractCegarLoop]: Abstraction has 134 states and 135 transitions. [2018-01-21 00:34:42,624 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 00:34:42,624 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 135 transitions. [2018-01-21 00:34:42,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-01-21 00:34:42,625 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:42,625 INFO L322 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 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 00:34:42,625 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:42,625 INFO L82 PathProgramCache]: Analyzing trace with hash -2106276841, now seen corresponding path program 12 times [2018-01-21 00:34:42,625 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:42,626 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:42,626 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:42,626 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:42,626 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:42,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:42,641 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:42,795 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 00:34:42,795 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:42,795 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:42,795 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:42,795 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:42,795 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:42,795 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:42,800 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:34:42,800 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:34:42,821 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,829 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,835 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,841 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,858 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,889 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,928 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:42,957 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:43,039 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:43,229 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:43,403 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:43,857 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:44,048 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:44,143 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:44,145 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:44,150 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:44,343 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 50 proven. 338 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 00:34:44,343 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:44,835 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 00:34:44,857 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:44,857 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:44,861 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 00:34:44,861 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 00:34:44,889 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:44,927 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:44,971 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:45,023 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:45,089 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:45,163 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:45,329 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:46,243 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:47,684 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:47,916 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:48,178 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:48,502 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:48,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:49,181 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 00:34:49,218 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:49,225 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:49,394 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 00:34:49,394 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:49,890 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2018-01-21 00:34:49,892 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:49,892 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 16, 17, 18] total 78 [2018-01-21 00:34:49,892 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:49,893 INFO L409 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-01-21 00:34:49,893 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-01-21 00:34:49,894 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2129, Invalid=3877, Unknown=0, NotChecked=0, Total=6006 [2018-01-21 00:34:49,895 INFO L87 Difference]: Start difference. First operand 134 states and 135 transitions. Second operand 35 states. [2018-01-21 00:34:50,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:50,082 INFO L93 Difference]: Finished difference Result 218 states and 223 transitions. [2018-01-21 00:34:50,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 00:34:50,082 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 133 [2018-01-21 00:34:50,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:50,083 INFO L225 Difference]: With dead ends: 218 [2018-01-21 00:34:50,083 INFO L226 Difference]: Without dead ends: 152 [2018-01-21 00:34:50,085 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 470 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3264 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2206, Invalid=3956, Unknown=0, NotChecked=0, Total=6162 [2018-01-21 00:34:50,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-21 00:34:50,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 146. [2018-01-21 00:34:50,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-21 00:34:50,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 147 transitions. [2018-01-21 00:34:50,092 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 147 transitions. Word has length 133 [2018-01-21 00:34:50,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:50,092 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 147 transitions. [2018-01-21 00:34:50,092 INFO L433 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-01-21 00:34:50,092 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 147 transitions. [2018-01-21 00:34:50,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-01-21 00:34:50,093 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:50,094 INFO L322 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 14, 14, 14, 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 00:34:50,094 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:50,094 INFO L82 PathProgramCache]: Analyzing trace with hash -482480880, now seen corresponding path program 13 times [2018-01-21 00:34:50,094 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:50,094 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:50,094 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:50,095 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:50,095 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:50,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:50,115 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:50,345 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 00:34:50,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:50,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:50,345 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:50,346 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:50,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:50,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:50,351 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:50,351 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:34:50,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:50,382 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:50,839 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 00:34:50,839 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:51,422 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 00:34:51,443 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:51,443 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:51,447 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:51,447 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 00:34:51,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:51,535 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:51,570 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 00:34:51,570 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:51,889 INFO L134 CoverageAnalysis]: Checked inductivity of 842 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-01-21 00:34:51,890 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:51,890 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 20, 19, 20] total 53 [2018-01-21 00:34:51,890 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:51,891 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 00:34:51,891 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 00:34:51,892 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1717, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 00:34:51,892 INFO L87 Difference]: Start difference. First operand 146 states and 147 transitions. Second operand 36 states. [2018-01-21 00:34:52,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:52,158 INFO L93 Difference]: Finished difference Result 232 states and 236 transitions. [2018-01-21 00:34:52,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 00:34:52,158 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 145 [2018-01-21 00:34:52,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:52,160 INFO L225 Difference]: With dead ends: 232 [2018-01-21 00:34:52,160 INFO L226 Difference]: Without dead ends: 162 [2018-01-21 00:34:52,161 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 543 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1172 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1091, Invalid=1771, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 00:34:52,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-01-21 00:34:52,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 158. [2018-01-21 00:34:52,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-01-21 00:34:52,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 159 transitions. [2018-01-21 00:34:52,170 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 159 transitions. Word has length 145 [2018-01-21 00:34:52,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:52,171 INFO L432 AbstractCegarLoop]: Abstraction has 158 states and 159 transitions. [2018-01-21 00:34:52,171 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 00:34:52,171 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 159 transitions. [2018-01-21 00:34:52,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-01-21 00:34:52,172 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:52,172 INFO L322 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 16, 16, 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 00:34:52,172 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:52,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1554134921, now seen corresponding path program 14 times [2018-01-21 00:34:52,173 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:52,173 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:52,173 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 00:34:52,174 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:52,174 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:52,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:52,194 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:52,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 00:34:52,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:52,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:52,598 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:52,598 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:52,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:52,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:52,603 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:34:52,603 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:52,620 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:52,631 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:52,633 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:52,636 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:52,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 00:34:52,841 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:53,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 00:34:53,385 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:53,385 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:53,388 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 00:34:53,388 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:34:53,409 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:53,460 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:34:53,484 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:53,491 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:53,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 00:34:53,527 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:53,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 00:34:53,783 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:34:53,783 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 21] total 56 [2018-01-21 00:34:53,783 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:34:53,784 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 00:34:53,784 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 00:34:53,785 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1163, Invalid=1917, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 00:34:53,785 INFO L87 Difference]: Start difference. First operand 158 states and 159 transitions. Second operand 38 states. [2018-01-21 00:34:54,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:34:54,027 INFO L93 Difference]: Finished difference Result 248 states and 251 transitions. [2018-01-21 00:34:54,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 00:34:54,028 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 157 [2018-01-21 00:34:54,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:34:54,028 INFO L225 Difference]: With dead ends: 248 [2018-01-21 00:34:54,028 INFO L226 Difference]: Without dead ends: 170 [2018-01-21 00:34:54,029 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 589 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1218, Invalid=1974, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 00:34:54,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-01-21 00:34:54,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 166. [2018-01-21 00:34:54,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-21 00:34:54,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-01-21 00:34:54,036 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 157 [2018-01-21 00:34:54,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:34:54,037 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-01-21 00:34:54,037 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 00:34:54,037 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-01-21 00:34:54,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-01-21 00:34:54,038 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:34:54,038 INFO L322 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 17, 17, 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 00:34:54,038 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:34:54,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1556447895, now seen corresponding path program 15 times [2018-01-21 00:34:54,038 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:34:54,039 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:54,039 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:34:54,039 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:34:54,039 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:34:54,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:34:54,062 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:34:54,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 00:34:54,366 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:54,366 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:34:54,366 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:34:54,366 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:34:54,366 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:54,366 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:34:54,377 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:34:54,378 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:34:54,396 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,400 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,402 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,406 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,414 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,441 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,451 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,469 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,497 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,511 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,537 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,639 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:54,780 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:55,250 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:55,478 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:55,782 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:55,909 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:56,515 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:56,517 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:34:56,522 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:34:56,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 00:34:56,736 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:34:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 644 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2018-01-21 00:34:57,452 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:34:57,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:34:57,455 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 00:34:57,455 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 00:34:57,478 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:57,512 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:57,556 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:57,606 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:57,685 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:57,793 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:57,938 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:58,090 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:58,261 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:58,510 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:58,858 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:59,274 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:34:59,717 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:35:00,276 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:35:00,954 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:35:01,658 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:35:02,386 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:35:03,317 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 00:35:03,362 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:35:03,369 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:35:03,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 00:35:03,391 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:35:03,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2018-01-21 00:35:03,744 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:35:03,744 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 24, 20, 20] total 80 [2018-01-21 00:35:03,744 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:35:03,745 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 00:35:03,745 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 00:35:03,746 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2304, Invalid=4016, Unknown=0, NotChecked=0, Total=6320 [2018-01-21 00:35:03,747 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 40 states. [2018-01-21 00:35:03,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:35:03,950 INFO L93 Difference]: Finished difference Result 260 states and 263 transitions. [2018-01-21 00:35:03,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 00:35:03,950 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 165 [2018-01-21 00:35:03,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:35:03,951 INFO L225 Difference]: With dead ends: 260 [2018-01-21 00:35:03,951 INFO L226 Difference]: Without dead ends: 178 [2018-01-21 00:35:03,953 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 600 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3081 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2383, Invalid=4097, Unknown=0, NotChecked=0, Total=6480 [2018-01-21 00:35:03,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-01-21 00:35:03,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2018-01-21 00:35:03,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-01-21 00:35:03,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2018-01-21 00:35:03,961 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 165 [2018-01-21 00:35:03,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:35:03,961 INFO L432 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2018-01-21 00:35:03,961 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 00:35:03,961 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2018-01-21 00:35:03,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 00:35:03,962 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:35:03,962 INFO L322 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 18, 18, 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 00:35:03,962 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:35:03,962 INFO L82 PathProgramCache]: Analyzing trace with hash -899628105, now seen corresponding path program 16 times [2018-01-21 00:35:03,962 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:35:03,963 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:35:03,963 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:35:03,963 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:35:03,963 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:35:03,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:35:03,983 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:35:04,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 00:35:04,335 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:35:04,335 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:35:04,335 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:35:04,335 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:35:04,335 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:35:04,336 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:35:04,340 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:35:04,341 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:35:05,425 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:35:05,429 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:35:05,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 00:35:05,637 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:35:06,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 00:35:06,296 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:35:06,297 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 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 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 00:35:06,299 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 00:35:06,300 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 00:35:06,609 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 00:35:06,616 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 00:35:06,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 00:35:06,646 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 00:35:06,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 648 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-01-21 00:35:06,938 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 00:35:06,938 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23, 22, 23] total 62 [2018-01-21 00:35:06,939 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 00:35:06,939 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-21 00:35:06,939 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-21 00:35:06,940 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1432, Invalid=2350, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 00:35:06,940 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand 42 states. [2018-01-21 00:35:07,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 00:35:07,131 INFO L93 Difference]: Finished difference Result 272 states and 275 transitions. [2018-01-21 00:35:07,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 00:35:07,131 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 173 [2018-01-21 00:35:07,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 00:35:07,132 INFO L225 Difference]: With dead ends: 272 [2018-01-21 00:35:07,133 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 00:35:07,134 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 649 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1649 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1493, Invalid=2413, Unknown=0, NotChecked=0, Total=3906 [2018-01-21 00:35:07,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 00:35:07,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 182. [2018-01-21 00:35:07,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-01-21 00:35:07,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2018-01-21 00:35:07,142 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 173 [2018-01-21 00:35:07,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 00:35:07,143 INFO L432 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2018-01-21 00:35:07,143 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-21 00:35:07,143 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2018-01-21 00:35:07,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-01-21 00:35:07,144 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 00:35:07,145 INFO L322 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 19, 19, 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 00:35:07,145 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 00:35:07,145 INFO L82 PathProgramCache]: Analyzing trace with hash 965544919, now seen corresponding path program 17 times [2018-01-21 00:35:07,145 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 00:35:07,146 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:35:07,146 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 00:35:07,146 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 00:35:07,146 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 00:35:07,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 00:35:07,168 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 00:35:07,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 722 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2018-01-21 00:35:07,548 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:35:07,548 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 00:35:07,548 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 00:35:07,548 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 00:35:07,548 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 00:35:07,548 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 00:35:07,553 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 00:35:07,554 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 00:35:07,567 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,570 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,573 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,577 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,587 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,612 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,625 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,693 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:07,871 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:08,031 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:08,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:08,826 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:10,536 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:12,805 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:14,286 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:24,126 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... [2018-01-21 00:35:27,452 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 00:35:27,734 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown