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_mostprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:16:22,934 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:16:22,936 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:16:22,951 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:16:22,952 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:16:22,953 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:16:22,954 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:16:22,955 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:16:22,957 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:16:22,958 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:16:22,958 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:16:22,958 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:16:22,960 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:16:22,961 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:16:22,962 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:16:22,964 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:16:22,967 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:16:22,969 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:16:22,970 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:16:22,971 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:16:22,974 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 03:16:22,974 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 03:16:22,974 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 03:16:22,975 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 03:16:22,976 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 03:16:22,977 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 03:16:22,977 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 03:16:22,978 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 03:16:22,978 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 03:16:22,979 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 03:16:22,979 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 03:16:22,979 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_mostprecise.epf [2018-01-21 03:16:22,989 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:16:22,990 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:16:22,991 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:16:22,991 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:16:22,991 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:16:22,991 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:16:22,991 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:16:22,992 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:16:22,992 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:16:22,993 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:16:22,993 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:16:22,993 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:16:22,993 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:16:22,993 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:16:22,993 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:16:22,994 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:16:22,994 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:16:22,994 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:16:22,994 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:16:22,994 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:16:22,995 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:16:22,995 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:16:22,995 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:16:22,995 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:16:22,995 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:16:22,996 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:16:22,996 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:16:22,996 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:16:22,996 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:16:22,996 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:16:22,997 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:16:22,997 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:16:22,997 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:16:22,997 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:16:22,997 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:16:22,997 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:16:22,998 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:16:22,998 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:16:22,999 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:16:22,999 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:16:23,036 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:16:23,049 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:16:23,054 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:16:23,055 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:16:23,056 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:16:23,057 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 03:16:23,210 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:16:23,217 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:16:23,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:16:23,219 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:16:23,227 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:16:23,228 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,233 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29a64a89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23, skipping insertion in model container [2018-01-21 03:16:23,233 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,247 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:16:23,262 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:16:23,417 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:16:23,442 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:16:23,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23 WrapperNode [2018-01-21 03:16:23,451 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:16:23,452 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:16:23,452 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:16:23,452 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:16:23,471 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,484 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,484 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,488 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,492 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,494 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (1/1) ... [2018-01-21 03:16:23,496 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:16:23,497 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:16:23,497 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:16:23,497 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:16:23,498 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (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 03:16:23,564 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:16:23,565 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:16:23,565 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 03:16:23,565 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:16:23,565 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 03:16:23,565 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 03:16:23,565 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:16:23,565 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:16:23,566 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:16:23,566 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 03:16:23,566 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:16:23,566 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:16:23,566 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:16:23,835 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:16:23,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:16:23 BoogieIcfgContainer [2018-01-21 03:16:23,836 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:16:23,836 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:16:23,836 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:16:23,838 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:16:23,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:16:23" (1/3) ... [2018-01-21 03:16:23,839 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b55f757 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:16:23, skipping insertion in model container [2018-01-21 03:16:23,839 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:16:23" (2/3) ... [2018-01-21 03:16:23,840 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b55f757 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:16:23, skipping insertion in model container [2018-01-21 03:16:23,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:16:23" (3/3) ... [2018-01-21 03:16:23,841 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 03:16:23,849 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:16:23,855 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 03:16:23,893 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:16:23,893 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:16:23,893 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:16:23,893 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:16:23,893 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:16:23,893 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:16:23,894 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:16:23,894 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:16:23,895 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:16:23,916 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 03:16:23,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:16:23,923 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:23,924 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:16:23,924 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:16:23,928 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 03:16:23,930 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:23,976 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:23,976 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:23,976 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:23,976 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:24,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:16:24,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:16:24,040 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:16:24,046 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:16:24,052 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:16:24,052 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:16:24,052 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:16:24,052 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:16:24,052 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:16:24,052 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:16:24,052 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:16:24,053 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 03:16:24,053 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:16:24,054 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 03:16:24,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 03:16:24,055 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:24,055 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:24,055 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 03:16:24,056 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 03:16:24,056 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:24,057 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,057 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:24,057 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,057 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:24,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:24,084 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:24,116 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 03:16:24,118 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:16:24,119 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:16:24,119 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:16:24,121 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:16:24,140 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:16:24,140 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:16:24,144 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 03:16:24,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:24,179 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 03:16:24,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:16:24,181 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 03:16:24,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:24,190 INFO L225 Difference]: With dead ends: 78 [2018-01-21 03:16:24,191 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 03:16:24,195 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 03:16:24,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 03:16:24,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 03:16:24,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 03:16:24,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 03:16:24,311 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 03:16:24,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:24,311 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 03:16:24,311 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:16:24,311 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 03:16:24,311 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 03:16:24,314 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:16:24,314 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:16:24,314 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:16:24,314 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:16:24,314 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:16:24,314 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:16:24,314 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:16:24,314 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:16:24,314 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:16:24,316 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 03:16:24,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 03:16:24,317 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:24,317 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:24,317 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:24,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 03:16:24,318 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:24,318 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,319 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:24,319 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,319 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:24,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:24,326 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:24,337 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 03:16:24,337 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:16:24,337 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 03:16:24,337 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:16:24,338 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 03:16:24,338 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 03:16:24,338 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 03:16:24,338 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 03:16:24,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:24,343 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 03:16:24,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 03:16:24,343 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 03:16:24,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:24,345 INFO L225 Difference]: With dead ends: 78 [2018-01-21 03:16:24,345 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 03:16:24,346 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 03:16:24,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 03:16:24,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 03:16:24,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 03:16:24,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 03:16:24,356 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 03:16:24,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:24,357 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 03:16:24,357 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 03:16:24,357 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 03:16:24,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 03:16:24,358 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:24,358 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:24,358 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:24,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 03:16:24,359 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:24,359 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,360 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:24,360 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,360 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:24,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:24,372 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:24,425 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 03:16:24,426 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:16:24,426 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 03:16:24,426 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:16:24,428 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 03:16:24,428 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 03:16:24,428 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 03:16:24,429 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 03:16:24,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:24,538 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 03:16:24,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 03:16:24,538 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 03:16:24,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:24,542 INFO L225 Difference]: With dead ends: 73 [2018-01-21 03:16:24,542 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 03:16:24,544 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 03:16:24,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 03:16:24,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 03:16:24,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 03:16:24,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 03:16:24,558 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 03:16:24,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:24,558 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 03:16:24,559 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 03:16:24,559 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 03:16:24,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 03:16:24,560 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:24,560 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:24,560 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:24,561 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 03:16:24,561 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:24,562 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,562 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:24,562 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:24,562 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:24,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:24,583 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:24,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:16:24,658 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:24,658 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:24,659 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 03:16:24,663 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 03:16:24,728 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:16:24,729 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:16:26,867 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:16:26,869 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 03:16:26,898 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:16:26,898 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:26,898 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 03:16:26,907 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:26,907 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:16:26,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:26,947 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:26,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:16:26,998 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:27,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:16:27,188 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 03:16:27,188 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 8 [2018-01-21 03:16:27,188 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:16:27,189 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 03:16:27,189 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 03:16:27,189 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-01-21 03:16:27,189 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 03:16:27,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:27,345 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 03:16:27,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 03:16:27,345 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 03:16:27,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:27,347 INFO L225 Difference]: With dead ends: 86 [2018-01-21 03:16:27,347 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 03:16:27,348 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-01-21 03:16:27,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 03:16:27,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-01-21 03:16:27,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 03:16:27,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-01-21 03:16:27,361 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 34 [2018-01-21 03:16:27,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:27,361 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-01-21 03:16:27,361 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 03:16:27,361 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-01-21 03:16:27,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 03:16:27,363 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:27,363 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:27,363 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:27,364 INFO L82 PathProgramCache]: Analyzing trace with hash 2113336574, now seen corresponding path program 1 times [2018-01-21 03:16:27,364 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:27,365 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:27,365 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:27,365 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:27,366 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:27,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:27,384 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:27,432 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 03:16:27,432 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:27,433 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:27,433 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 03:16:27,433 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 03:16:27,435 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:16:27,435 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:16:28,918 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:16:28,950 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 03:16:28,965 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:16:28,965 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:28,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:28,974 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:28,975 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:16:28,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:29,001 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:29,014 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 03:16:29,014 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:29,063 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 03:16:29,099 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:29,099 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:29,109 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:29,109 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:16:29,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:29,152 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:29,158 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 03:16:29,158 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:29,190 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 03:16:29,192 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:29,193 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 03:16:29,193 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:29,193 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 03:16:29,194 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 03:16:29,194 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 03:16:29,194 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 5 states. [2018-01-21 03:16:29,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:29,302 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2018-01-21 03:16:29,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:16:29,303 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 03:16:29,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:29,304 INFO L225 Difference]: With dead ends: 94 [2018-01-21 03:16:29,304 INFO L226 Difference]: Without dead ends: 76 [2018-01-21 03:16:29,305 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 03:16:29,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-21 03:16:29,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-01-21 03:16:29,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 03:16:29,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2018-01-21 03:16:29,312 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 39 [2018-01-21 03:16:29,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:29,313 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2018-01-21 03:16:29,313 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 03:16:29,313 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2018-01-21 03:16:29,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 03:16:29,316 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:29,316 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:29,316 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:29,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1575876768, now seen corresponding path program 2 times [2018-01-21 03:16:29,317 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:29,317 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:29,318 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:29,318 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:29,318 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:29,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:29,339 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:29,394 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 03:16:29,395 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:29,395 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:29,395 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:29,395 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:29,395 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:29,395 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:29,404 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:16:29,405 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:29,423 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:29,436 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:29,438 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:29,442 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:29,530 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 03:16:29,530 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:29,753 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 03:16:29,788 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:29,788 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:29,792 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:16:29,792 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:29,807 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:29,825 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:29,837 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:29,842 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:29,886 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 03:16:29,887 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:30,018 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 03:16:30,020 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:30,020 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 03:16:30,020 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:30,021 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 03:16:30,021 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 03:16:30,021 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 03:16:30,022 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 10 states. [2018-01-21 03:16:30,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:30,289 INFO L93 Difference]: Finished difference Result 164 states and 184 transitions. [2018-01-21 03:16:30,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 03:16:30,290 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 57 [2018-01-21 03:16:30,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:30,292 INFO L225 Difference]: With dead ends: 164 [2018-01-21 03:16:30,292 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 03:16:30,293 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 03:16:30,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 03:16:30,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 86. [2018-01-21 03:16:30,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 03:16:30,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2018-01-21 03:16:30,305 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 57 [2018-01-21 03:16:30,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:30,305 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2018-01-21 03:16:30,305 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 03:16:30,305 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2018-01-21 03:16:30,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 03:16:30,307 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:30,307 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:30,307 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:30,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1577101506, now seen corresponding path program 3 times [2018-01-21 03:16:30,308 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:30,308 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:30,309 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:30,309 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:30,309 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:30,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:30,334 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:30,416 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 03:16:30,416 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:30,416 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:30,416 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:30,417 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:30,417 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:30,417 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:30,422 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:30,422 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:30,435 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,439 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,444 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,451 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,452 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:30,456 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:30,473 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 03:16:30,474 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:30,546 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 03:16:30,566 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:30,566 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:30,569 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:30,569 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:30,582 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,591 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,605 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,628 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:30,641 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:30,646 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:30,658 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 03:16:30,659 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:30,691 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 03:16:30,693 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:30,693 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 03:16:30,693 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:30,693 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 03:16:30,694 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 03:16:30,694 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:16:30,694 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand 7 states. [2018-01-21 03:16:30,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:30,778 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-01-21 03:16:30,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 03:16:30,778 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 85 [2018-01-21 03:16:30,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:30,780 INFO L225 Difference]: With dead ends: 154 [2018-01-21 03:16:30,780 INFO L226 Difference]: Without dead ends: 126 [2018-01-21 03:16:30,781 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:16:30,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-21 03:16:30,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-21 03:16:30,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-21 03:16:30,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-01-21 03:16:30,793 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 85 [2018-01-21 03:16:30,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:30,794 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-01-21 03:16:30,794 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 03:16:30,794 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-01-21 03:16:30,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-01-21 03:16:30,796 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:30,796 INFO L322 BasicCegarLoop]: trace histogram [11, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:30,796 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:30,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1323929276, now seen corresponding path program 4 times [2018-01-21 03:16:30,797 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:30,797 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:30,798 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:30,798 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:30,798 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:30,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:30,826 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:30,951 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2018-01-21 03:16:30,951 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:30,951 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:30,951 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:30,951 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:30,952 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:30,952 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:30,958 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:30,958 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:30,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:30,990 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:31,075 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 03:16:31,075 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:31,278 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-21 03:16:31,312 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:31,312 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:31,316 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:31,317 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:31,363 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:31,369 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:31,389 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 03:16:31,389 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:31,517 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-21 03:16:31,518 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:31,518 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 03:16:31,518 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:31,519 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 03:16:31,519 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 03:16:31,519 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:16:31,519 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 14 states. [2018-01-21 03:16:31,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:31,767 INFO L93 Difference]: Finished difference Result 262 states and 293 transitions. [2018-01-21 03:16:31,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 03:16:31,767 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 108 [2018-01-21 03:16:31,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:31,769 INFO L225 Difference]: With dead ends: 262 [2018-01-21 03:16:31,769 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 03:16:31,770 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 412 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2018-01-21 03:16:31,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 03:16:31,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 131. [2018-01-21 03:16:31,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 03:16:31,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 03:16:31,785 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 108 [2018-01-21 03:16:31,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:31,785 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 03:16:31,785 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 03:16:31,785 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 03:16:31,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 03:16:31,787 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:31,787 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:31,787 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:31,788 INFO L82 PathProgramCache]: Analyzing trace with hash -481631070, now seen corresponding path program 5 times [2018-01-21 03:16:31,788 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:31,788 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:31,788 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:31,788 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:31,789 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:31,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:31,823 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:31,993 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 03:16:31,993 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:31,993 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:31,993 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:31,994 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:31,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:31,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:32,002 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:32,002 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:32,021 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,023 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,028 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,032 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,039 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,048 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,058 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,060 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:32,065 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:32,238 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 382 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-01-21 03:16:32,238 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:32,493 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 188 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2018-01-21 03:16:32,514 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:32,514 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:32,518 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:32,518 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:32,531 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,535 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,542 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,552 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,569 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,613 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,702 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:32,720 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:32,727 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:32,777 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 385 proven. 118 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-01-21 03:16:32,777 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:32,962 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 191 proven. 218 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [MP cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (12)] Exception during sending of exit command (exit): Broken pipe [2018-01-21 03:16:32,969 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:32,970 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13, 13, 13] total 28 [2018-01-21 03:16:32,970 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:32,970 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 03:16:32,970 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 03:16:32,971 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2018-01-21 03:16:32,971 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 19 states. [2018-01-21 03:16:33,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:33,461 INFO L93 Difference]: Finished difference Result 312 states and 349 transitions. [2018-01-21 03:16:33,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 03:16:33,461 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 146 [2018-01-21 03:16:33,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:33,465 INFO L225 Difference]: With dead ends: 312 [2018-01-21 03:16:33,465 INFO L226 Difference]: Without dead ends: 234 [2018-01-21 03:16:33,467 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 554 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 03:16:33,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-01-21 03:16:33,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 169. [2018-01-21 03:16:33,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-01-21 03:16:33,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 188 transitions. [2018-01-21 03:16:33,487 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 188 transitions. Word has length 146 [2018-01-21 03:16:33,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:33,488 INFO L432 AbstractCegarLoop]: Abstraction has 169 states and 188 transitions. [2018-01-21 03:16:33,488 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 03:16:33,488 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 188 transitions. [2018-01-21 03:16:33,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 03:16:33,490 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:33,491 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:33,491 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:33,491 INFO L82 PathProgramCache]: Analyzing trace with hash -75359012, now seen corresponding path program 6 times [2018-01-21 03:16:33,491 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:33,492 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:33,492 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:33,492 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:33,493 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:33,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:33,529 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:33,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 03:16:33,771 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:33,771 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:33,771 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:33,771 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:33,771 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:33,771 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:33,777 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:16:33,777 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:16:33,791 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,794 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,798 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,800 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,806 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,810 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,816 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,822 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,829 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:33,830 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:33,834 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:33,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 03:16:33,861 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:33,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 03:16:33,971 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:33,983 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:33,986 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:16:33,986 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:16:34,004 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,013 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,027 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,040 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,060 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,090 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,132 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,205 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,445 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:16:34,477 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:34,486 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:34,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 03:16:34,516 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:34,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 03:16:34,570 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:34,571 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 03:16:34,571 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:34,571 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 03:16:34,571 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 03:16:34,572 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:16:34,572 INFO L87 Difference]: Start difference. First operand 169 states and 188 transitions. Second operand 10 states. [2018-01-21 03:16:34,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:34,675 INFO L93 Difference]: Finished difference Result 267 states and 298 transitions. [2018-01-21 03:16:34,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:16:34,675 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 189 [2018-01-21 03:16:34,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:34,678 INFO L225 Difference]: With dead ends: 267 [2018-01-21 03:16:34,678 INFO L226 Difference]: Without dead ends: 224 [2018-01-21 03:16:34,678 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 748 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:16:34,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2018-01-21 03:16:34,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 181. [2018-01-21 03:16:34,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-21 03:16:34,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2018-01-21 03:16:34,699 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 189 [2018-01-21 03:16:34,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:34,700 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2018-01-21 03:16:34,700 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 03:16:34,700 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2018-01-21 03:16:34,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-01-21 03:16:34,702 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:34,703 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:34,703 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:34,703 INFO L82 PathProgramCache]: Analyzing trace with hash -520842402, now seen corresponding path program 7 times [2018-01-21 03:16:34,703 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:34,703 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:34,704 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:34,704 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:34,704 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:34,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:34,738 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:35,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-21 03:16:35,027 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:35,027 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:35,027 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:35,027 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:35,027 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:35,027 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:35,044 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:35,044 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:16:35,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:35,108 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:35,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-21 03:16:35,322 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:35,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-21 03:16:35,778 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:35,778 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:35,786 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:35,786 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:16:35,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:35,918 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:35,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-21 03:16:35,989 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:36,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-21 03:16:36,292 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:36,292 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 03:16:36,292 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:36,293 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 03:16:36,293 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 03:16:36,293 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 03:16:36,294 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand 21 states. [2018-01-21 03:16:36,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:36,906 INFO L93 Difference]: Finished difference Result 470 states and 526 transitions. [2018-01-21 03:16:36,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 03:16:36,906 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 222 [2018-01-21 03:16:36,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:36,909 INFO L225 Difference]: With dead ends: 470 [2018-01-21 03:16:36,910 INFO L226 Difference]: Without dead ends: 367 [2018-01-21 03:16:36,911 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 858 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:16:36,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-01-21 03:16:36,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 224. [2018-01-21 03:16:36,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2018-01-21 03:16:36,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 251 transitions. [2018-01-21 03:16:36,931 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 251 transitions. Word has length 222 [2018-01-21 03:16:36,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:36,932 INFO L432 AbstractCegarLoop]: Abstraction has 224 states and 251 transitions. [2018-01-21 03:16:36,932 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 03:16:36,932 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 251 transitions. [2018-01-21 03:16:36,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 03:16:36,936 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:36,937 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:36,937 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:36,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1579608284, now seen corresponding path program 8 times [2018-01-21 03:16:36,937 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:36,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:36,938 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:16:36,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:36,938 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:36,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:36,986 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:37,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 03:16:37,219 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:37,219 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:37,220 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:37,220 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:37,220 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:37,220 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:37,225 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:16:37,225 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:37,247 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:37,288 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:37,298 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:37,306 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:37,729 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-21 03:16:37,730 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:38,367 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-21 03:16:38,402 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:38,402 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:38,414 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:16:38,414 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:38,444 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:38,508 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:38,555 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:38,566 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:38,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-21 03:16:38,609 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:38,879 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-21 03:16:38,881 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:38,881 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 03:16:38,881 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:38,882 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 03:16:38,882 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 03:16:38,882 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 03:16:38,883 INFO L87 Difference]: Start difference. First operand 224 states and 251 transitions. Second operand 24 states. [2018-01-21 03:16:39,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:39,870 INFO L93 Difference]: Finished difference Result 579 states and 648 transitions. [2018-01-21 03:16:39,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 03:16:39,870 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 275 [2018-01-21 03:16:39,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:39,872 INFO L225 Difference]: With dead ends: 579 [2018-01-21 03:16:39,873 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 03:16:39,873 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 1065 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 03:16:39,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 03:16:39,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 272. [2018-01-21 03:16:39,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-01-21 03:16:39,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 306 transitions. [2018-01-21 03:16:39,892 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 306 transitions. Word has length 275 [2018-01-21 03:16:39,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:39,892 INFO L432 AbstractCegarLoop]: Abstraction has 272 states and 306 transitions. [2018-01-21 03:16:39,892 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 03:16:39,892 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 306 transitions. [2018-01-21 03:16:39,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 03:16:39,898 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:39,898 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:39,898 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:39,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1321832962, now seen corresponding path program 9 times [2018-01-21 03:16:39,899 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:39,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:39,900 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:39,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:39,900 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:39,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:39,963 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:40,331 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 03:16:40,331 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:40,331 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:40,331 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:40,332 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:40,332 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:40,332 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:40,347 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:40,347 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:40,375 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,378 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,383 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,389 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,396 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,404 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,412 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,423 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:40,425 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:40,431 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:40,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 03:16:40,641 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:41,058 WARN L143 SmtUtils]: Spent 182ms on a formula simplification that was a NOOP. DAG size: 28 [2018-01-21 03:16:41,238 WARN L143 SmtUtils]: Spent 179ms on a formula simplification that was a NOOP. DAG size: 28 [2018-01-21 03:16:41,345 WARN L143 SmtUtils]: Spent 104ms on a formula simplification that was a NOOP. DAG size: 31 [2018-01-21 03:16:41,768 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 03:16:41,803 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:41,804 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:41,809 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:16:41,809 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:16:41,855 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:41,875 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:41,899 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:41,933 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:41,998 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:42,117 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:42,346 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:42,705 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:16:42,764 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:42,776 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:42,857 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 03:16:42,857 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:43,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 03:16:43,357 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:43,357 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 03:16:43,357 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:43,358 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 03:16:43,358 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 03:16:43,358 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 03:16:43,358 INFO L87 Difference]: Start difference. First operand 272 states and 306 transitions. Second operand 20 states. [2018-01-21 03:16:43,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:43,758 INFO L93 Difference]: Finished difference Result 669 states and 759 transitions. [2018-01-21 03:16:43,758 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 03:16:43,758 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 333 [2018-01-21 03:16:43,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:43,762 INFO L225 Difference]: With dead ends: 669 [2018-01-21 03:16:43,762 INFO L226 Difference]: Without dead ends: 611 [2018-01-21 03:16:43,764 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1349 GetRequests, 1312 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 03:16:43,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2018-01-21 03:16:43,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 333. [2018-01-21 03:16:43,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2018-01-21 03:16:43,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 380 transitions. [2018-01-21 03:16:43,791 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 380 transitions. Word has length 333 [2018-01-21 03:16:43,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:43,792 INFO L432 AbstractCegarLoop]: Abstraction has 333 states and 380 transitions. [2018-01-21 03:16:43,792 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 03:16:43,792 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 380 transitions. [2018-01-21 03:16:43,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-01-21 03:16:43,798 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:43,798 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:43,798 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:43,799 INFO L82 PathProgramCache]: Analyzing trace with hash -626287868, now seen corresponding path program 10 times [2018-01-21 03:16:43,799 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:43,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:43,800 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:43,800 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:43,800 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:43,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:43,853 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:44,353 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-21 03:16:44,353 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:44,353 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:44,353 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:44,353 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:44,353 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:44,353 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:44,359 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:44,359 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:44,439 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:44,444 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:44,713 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-21 03:16:44,713 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:45,171 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-21 03:16:45,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:45,192 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:45,197 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:16:45,197 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:16:45,356 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:45,370 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:45,503 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-21 03:16:45,503 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:46,072 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-21 03:16:46,075 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:46,075 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 03:16:46,076 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:46,077 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 03:16:46,077 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 03:16:46,077 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:16:46,078 INFO L87 Difference]: Start difference. First operand 333 states and 380 transitions. Second operand 30 states. [2018-01-21 03:16:46,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:46,928 INFO L93 Difference]: Finished difference Result 877 states and 999 transitions. [2018-01-21 03:16:46,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 03:16:46,928 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 396 [2018-01-21 03:16:46,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:46,934 INFO L225 Difference]: With dead ends: 877 [2018-01-21 03:16:46,934 INFO L226 Difference]: Without dead ends: 721 [2018-01-21 03:16:46,936 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1613 GetRequests, 1539 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 03:16:46,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2018-01-21 03:16:46,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 391. [2018-01-21 03:16:46,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2018-01-21 03:16:46,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 444 transitions. [2018-01-21 03:16:46,967 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 444 transitions. Word has length 396 [2018-01-21 03:16:46,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:46,967 INFO L432 AbstractCegarLoop]: Abstraction has 391 states and 444 transitions. [2018-01-21 03:16:46,967 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 03:16:46,968 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 444 transitions. [2018-01-21 03:16:46,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2018-01-21 03:16:46,971 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:46,971 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:46,971 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:46,972 INFO L82 PathProgramCache]: Analyzing trace with hash 91735614, now seen corresponding path program 11 times [2018-01-21 03:16:46,972 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:46,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:46,973 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:46,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:46,973 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:47,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:47,026 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:16:47,521 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-21 03:16:47,522 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:47,522 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:16:47,522 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:16:47,522 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:16:47,522 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:47,522 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:16:47,530 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:47,530 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:47,566 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,572 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,580 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,590 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,602 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,615 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,627 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,643 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:47,645 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:47,653 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:47,976 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-21 03:16:47,976 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:48,459 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-21 03:16:48,481 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:16:48,481 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:16:48,484 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:16:48,484 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:16:48,520 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:48,532 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:48,558 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:48,604 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:48,701 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:50,680 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:56,548 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:56,975 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:16:57,065 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:16:57,092 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:16:57,231 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-21 03:16:57,231 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:16:57,719 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-21 03:16:57,723 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:16:57,724 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 40 [2018-01-21 03:16:57,724 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:16:57,725 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 03:16:57,725 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 03:16:57,725 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1318, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 03:16:57,726 INFO L87 Difference]: Start difference. First operand 391 states and 444 transitions. Second operand 31 states. [2018-01-21 03:16:59,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:16:59,797 INFO L93 Difference]: Finished difference Result 966 states and 1091 transitions. [2018-01-21 03:16:59,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 03:16:59,800 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 459 [2018-01-21 03:16:59,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:16:59,806 INFO L225 Difference]: With dead ends: 966 [2018-01-21 03:16:59,806 INFO L226 Difference]: Without dead ends: 554 [2018-01-21 03:16:59,810 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1888 GetRequests, 1801 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 03:16:59,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2018-01-21 03:16:59,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 395. [2018-01-21 03:16:59,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2018-01-21 03:16:59,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 440 transitions. [2018-01-21 03:16:59,840 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 440 transitions. Word has length 459 [2018-01-21 03:16:59,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:16:59,841 INFO L432 AbstractCegarLoop]: Abstraction has 395 states and 440 transitions. [2018-01-21 03:16:59,841 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 03:16:59,841 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 440 transitions. [2018-01-21 03:16:59,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2018-01-21 03:16:59,845 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:16:59,846 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:16:59,846 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:16:59,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1309279644, now seen corresponding path program 12 times [2018-01-21 03:16:59,846 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:16:59,847 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:59,847 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:16:59,847 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:16:59,847 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:16:59,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:16:59,905 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:17:00,597 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-21 03:17:00,597 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:17:00,597 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:17:00,597 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:17:00,598 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:17:00,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:17:00,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:17:00,606 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:17:00,606 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:17:00,682 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,689 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,696 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,703 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,710 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,727 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,741 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,756 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,781 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,805 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,824 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,885 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,909 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,937 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:00,961 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:01,023 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:01,062 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:01,125 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:01,128 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:17:01,138 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:17:01,711 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-21 03:17:01,712 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:17:02,056 WARN L143 SmtUtils]: Spent 136ms on a formula simplification that was a NOOP. DAG size: 42 [2018-01-21 03:17:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-21 03:17:03,080 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:17:03,080 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:17:03,089 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:17:03,089 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:17:03,145 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:03,161 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:03,205 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:17:03,276 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 03:17:12,079 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown