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_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:42:54,058 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:42:54,060 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:42:54,075 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:42:54,076 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:42:54,077 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:42:54,078 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:42:54,080 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:42:54,082 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:42:54,083 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:42:54,084 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:42:54,084 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:42:54,085 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:42:54,086 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:42:54,087 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:42:54,090 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:42:54,092 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:42:54,094 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:42:54,096 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:42:54,097 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:42:54,100 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 08:42:54,100 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 08:42:54,100 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 08:42:54,101 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 08:42:54,102 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 08:42:54,104 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 08:42:54,104 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 08:42:54,105 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 08:42:54,105 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 08:42:54,105 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:42:54,106 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:42:54,106 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_preciseopt.epf [2018-01-21 08:42:54,115 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:42:54,115 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:42:54,116 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:42:54,116 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:42:54,116 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:42:54,117 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:42:54,117 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:42:54,117 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:42:54,117 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:42:54,117 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:42:54,118 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:42:54,119 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:42:54,119 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:42:54,119 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:42:54,119 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:42:54,119 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:42:54,119 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:42:54,120 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:42:54,120 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:42:54,120 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:42:54,120 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:42:54,120 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:42:54,121 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:42:54,121 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:42:54,122 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:42:54,122 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:42:54,122 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:42:54,157 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:42:54,168 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:42:54,172 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:42:54,173 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:42:54,174 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:42:54,174 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c [2018-01-21 08:42:54,283 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:42:54,288 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:42:54,288 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:42:54,289 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:42:54,294 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:42:54,295 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,298 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23155f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54, skipping insertion in model container [2018-01-21 08:42:54,298 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,313 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:42:54,327 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:42:54,448 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:42:54,466 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:42:54,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54 WrapperNode [2018-01-21 08:42:54,473 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:42:54,474 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:42:54,474 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:42:54,474 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:42:54,491 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,491 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,501 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,501 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,504 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,507 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... [2018-01-21 08:42:54,509 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:42:54,509 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:42:54,509 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:42:54,509 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:42:54,510 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:42:54,552 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:42:54,553 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:42:54,553 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:42:54,553 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:42:54,553 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:42:54,553 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:42:54,553 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:42:54,554 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:42:54,554 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:42:54,554 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:42:54,554 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:42:54,554 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:42:54,554 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:42:54,700 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:42:54,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:42:54 BoogieIcfgContainer [2018-01-21 08:42:54,700 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:42:54,701 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:42:54,701 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:42:54,702 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:42:54,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:42:54" (1/3) ... [2018-01-21 08:42:54,703 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418b77a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:42:54, skipping insertion in model container [2018-01-21 08:42:54,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:42:54" (2/3) ... [2018-01-21 08:42:54,704 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418b77a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:42:54, skipping insertion in model container [2018-01-21 08:42:54,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:42:54" (3/3) ... [2018-01-21 08:42:54,705 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-read.c [2018-01-21 08:42:54,714 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:42:54,722 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:42:54,767 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:42:54,768 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:42:54,768 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:42:54,768 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:42:54,768 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:42:54,768 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:42:54,768 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:42:54,768 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:42:54,769 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:42:54,783 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:42:54,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:42:54,789 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:54,790 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:42:54,790 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:42:54,796 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 08:42:54,798 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:54,839 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:54,839 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:54,839 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:54,839 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:54,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:42:54,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:42:54,890 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:42:54,896 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:42:54,901 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:42:54,901 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:42:54,901 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:42:54,901 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:42:54,902 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:42:54,902 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:42:54,902 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:42:54,902 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:42:54,902 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:42:54,903 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:42:54,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:42:54,904 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:54,904 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:54,904 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:42:54,905 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 08:42:54,905 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:54,906 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:54,906 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:54,906 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:54,906 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:54,928 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:54,955 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 08:42:54,956 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:42:54,957 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:42:54,957 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:42:54,958 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:42:54,968 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:42:54,969 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:42:54,971 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:42:55,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:55,000 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:42:55,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:42:55,002 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:42:55,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:55,010 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:42:55,010 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:42:55,014 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 08:42:55,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:42:55,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:42:55,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:42:55,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:42:55,104 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:42:55,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:55,105 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:42:55,105 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:42:55,105 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:42:55,105 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:42:55,108 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:42:55,108 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:42:55,109 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:42:55,109 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:42:55,109 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:42:55,109 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:42:55,109 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:42:55,109 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:42:55,109 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:42:55,111 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:42:55,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:42:55,113 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:55,113 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 08:42:55,113 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:55,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 08:42:55,113 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:55,114 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,115 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:55,115 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,115 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:55,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:55,122 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:55,132 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 08:42:55,132 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:42:55,132 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:42:55,132 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:42:55,133 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:42:55,133 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:42:55,133 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:42:55,133 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:42:55,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:55,137 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:42:55,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:42:55,137 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:42:55,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:55,139 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:42:55,139 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 08:42:55,140 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 08:42:55,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 08:42:55,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 08:42:55,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 08:42:55,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 08:42:55,149 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 08:42:55,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:55,149 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 08:42:55,149 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:42:55,149 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 08:42:55,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:42:55,150 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:55,150 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 08:42:55,150 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:55,150 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 08:42:55,150 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:55,151 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,151 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:55,151 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,151 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:55,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:55,161 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:55,195 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 08:42:55,195 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:42:55,195 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:42:55,196 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:42:55,197 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:42:55,197 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:42:55,197 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:42:55,197 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 08:42:55,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:55,246 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 08:42:55,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:42:55,246 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:42:55,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:55,250 INFO L225 Difference]: With dead ends: 66 [2018-01-21 08:42:55,250 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:42:55,251 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 08:42:55,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:42:55,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 08:42:55,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 08:42:55,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 08:42:55,265 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 08:42:55,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:55,266 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 08:42:55,266 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:42:55,266 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 08:42:55,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 08:42:55,267 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:55,267 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:55,268 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:55,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 08:42:55,268 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:55,269 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,269 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:55,269 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,269 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:55,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:55,291 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:55,418 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 08:42:55,418 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:42:55,419 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 08:42:55,419 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:42:55,419 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:42:55,419 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:42:55,420 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 08:42:55,420 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 6 states. [2018-01-21 08:42:55,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:55,565 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2018-01-21 08:42:55,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:42:55,566 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2018-01-21 08:42:55,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:55,567 INFO L225 Difference]: With dead ends: 90 [2018-01-21 08:42:55,567 INFO L226 Difference]: Without dead ends: 59 [2018-01-21 08:42:55,567 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:42:55,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-01-21 08:42:55,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 47. [2018-01-21 08:42:55,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 08:42:55,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2018-01-21 08:42:55,573 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 31 [2018-01-21 08:42:55,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:55,574 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2018-01-21 08:42:55,574 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:42:55,574 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2018-01-21 08:42:55,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 08:42:55,576 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:55,576 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:55,576 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:55,576 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 08:42:55,576 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:55,577 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,577 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:55,577 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:55,578 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:55,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:55,595 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:55,705 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:42:55,705 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:55,706 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:55,707 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 08:42:55,708 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:42:55,765 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:42:55,765 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:42:57,985 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:42:57,986 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 08:42:58,002 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:42:58,002 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:58,002 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 08:42:58,018 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:58,018 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:42:58,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:58,054 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:58,297 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:42:58,297 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:58,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:42:58,909 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:58,909 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:58,913 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:58,913 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:42:58,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:58,941 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:59,058 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 08:42:59,058 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:59,147 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 08:42:59,149 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:59,149 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 16 [2018-01-21 08:42:59,149 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:59,150 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:42:59,150 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:42:59,151 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2018-01-21 08:42:59,151 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand 10 states. [2018-01-21 08:42:59,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:59,542 INFO L93 Difference]: Finished difference Result 103 states and 115 transitions. [2018-01-21 08:42:59,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 08:42:59,543 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 36 [2018-01-21 08:42:59,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:59,544 INFO L225 Difference]: With dead ends: 103 [2018-01-21 08:42:59,544 INFO L226 Difference]: Without dead ends: 61 [2018-01-21 08:42:59,544 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:42:59,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-01-21 08:42:59,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 48. [2018-01-21 08:42:59,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 08:42:59,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 08:42:59,549 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 08:42:59,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:59,550 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 08:42:59,550 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:42:59,550 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 08:42:59,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 08:42:59,551 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:59,551 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:59,551 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:59,552 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 08:42:59,552 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:59,553 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:59,553 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:59,553 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:59,553 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:59,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:59,568 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:59,601 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:42:59,601 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:59,601 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:59,602 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:59,602 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:59,602 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:59,602 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:59,609 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:42:59,609 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:59,619 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:59,625 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:59,626 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:59,629 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:59,643 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:42:59,643 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:42:59,697 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:59,697 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:59,700 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:42:59,700 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:59,709 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:59,719 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:59,726 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:59,729 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:59,734 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:42:59,734 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:59,750 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 08:42:59,752 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:59,752 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 08:42:59,752 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:59,752 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:42:59,752 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:42:59,752 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:42:59,753 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 5 states. [2018-01-21 08:42:59,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:59,808 INFO L93 Difference]: Finished difference Result 89 states and 99 transitions. [2018-01-21 08:42:59,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:42:59,808 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 41 [2018-01-21 08:42:59,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:59,810 INFO L225 Difference]: With dead ends: 89 [2018-01-21 08:42:59,810 INFO L226 Difference]: Without dead ends: 72 [2018-01-21 08:42:59,810 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 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 08:42:59,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-01-21 08:42:59,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 57. [2018-01-21 08:42:59,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 08:42:59,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 08:42:59,818 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 41 [2018-01-21 08:42:59,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:59,819 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 08:42:59,819 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:42:59,819 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 08:42:59,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-21 08:42:59,821 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:59,821 INFO L322 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:59,821 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:59,821 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 3 times [2018-01-21 08:42:59,821 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:59,822 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:59,823 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:59,823 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:59,823 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:59,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:59,844 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:59,891 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:42:59,892 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:59,892 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:59,892 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:59,892 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:59,892 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:59,892 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:59,897 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:42:59,897 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:42:59,905 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:59,908 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:59,912 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:59,912 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:59,915 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:59,929 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:42:59,929 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:59,981 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:43:00,013 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:00,013 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:00,018 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:00,019 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:00,034 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:00,042 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:00,055 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:00,062 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:00,066 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:00,074 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:43:00,074 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:00,118 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:43:00,119 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:00,119 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 08:43:00,120 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:00,120 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:43:00,120 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:43:00,120 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:43:00,121 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 6 states. [2018-01-21 08:43:00,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:00,206 INFO L93 Difference]: Finished difference Result 107 states and 120 transitions. [2018-01-21 08:43:00,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:43:00,206 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2018-01-21 08:43:00,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:00,208 INFO L225 Difference]: With dead ends: 107 [2018-01-21 08:43:00,208 INFO L226 Difference]: Without dead ends: 86 [2018-01-21 08:43:00,209 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:43:00,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-01-21 08:43:00,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 66. [2018-01-21 08:43:00,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-01-21 08:43:00,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 73 transitions. [2018-01-21 08:43:00,218 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 73 transitions. Word has length 62 [2018-01-21 08:43:00,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:00,218 INFO L432 AbstractCegarLoop]: Abstraction has 66 states and 73 transitions. [2018-01-21 08:43:00,218 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:43:00,218 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 73 transitions. [2018-01-21 08:43:00,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-01-21 08:43:00,220 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:00,220 INFO L322 BasicCegarLoop]: trace histogram [9, 6, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:00,220 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:00,221 INFO L82 PathProgramCache]: Analyzing trace with hash 1345357476, now seen corresponding path program 4 times [2018-01-21 08:43:00,221 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:00,221 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:00,222 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:00,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:00,222 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:00,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:00,243 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:00,325 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 08:43:00,325 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:00,325 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:00,325 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:00,326 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:00,326 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:00,326 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:00,333 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:00,334 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:00,361 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:00,365 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:00,467 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 118 proven. 9 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-01-21 08:43:00,467 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:00,639 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 50 proven. 42 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2018-01-21 08:43:00,663 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:00,663 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:00,666 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:00,666 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:00,701 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:00,706 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:00,721 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 118 proven. 9 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-01-21 08:43:00,722 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:00,932 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 50 proven. 42 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2018-01-21 08:43:00,934 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:00,934 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 8, 8] total 15 [2018-01-21 08:43:00,934 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:00,935 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 08:43:00,935 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 08:43:00,935 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:43:00,936 INFO L87 Difference]: Start difference. First operand 66 states and 73 transitions. Second operand 12 states. [2018-01-21 08:43:01,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:01,163 INFO L93 Difference]: Finished difference Result 185 states and 209 transitions. [2018-01-21 08:43:01,163 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:43:01,163 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 83 [2018-01-21 08:43:01,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:01,165 INFO L225 Difference]: With dead ends: 185 [2018-01-21 08:43:01,165 INFO L226 Difference]: Without dead ends: 135 [2018-01-21 08:43:01,165 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 315 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2018-01-21 08:43:01,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-01-21 08:43:01,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 96. [2018-01-21 08:43:01,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 08:43:01,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-21 08:43:01,178 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 83 [2018-01-21 08:43:01,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:01,179 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-21 08:43:01,179 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 08:43:01,179 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-21 08:43:01,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-21 08:43:01,182 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:01,182 INFO L322 BasicCegarLoop]: trace histogram [15, 11, 11, 11, 11, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:01,182 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:01,182 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 5 times [2018-01-21 08:43:01,182 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:01,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:01,183 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:01,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:01,184 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:01,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:01,211 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:01,323 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2018-01-21 08:43:01,324 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:01,324 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:01,324 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:01,324 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:01,324 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:01,324 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:01,333 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:01,333 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:01,348 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,350 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,355 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,360 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,364 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,365 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:01,369 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:01,510 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 270 proven. 118 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2018-01-21 08:43:01,510 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:01,753 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 105 proven. 218 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2018-01-21 08:43:01,799 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:01,799 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:01,802 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:01,802 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:01,813 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,818 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,829 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,846 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,867 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:01,878 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:01,883 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:01,926 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 302 proven. 95 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-01-21 08:43:01,926 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:02,133 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 142 proven. 207 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-01-21 08:43:02,134 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:02,135 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 13, 13, 13, 13] total 29 [2018-01-21 08:43:02,135 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:02,136 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:43:02,136 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:43:02,136 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2018-01-21 08:43:02,136 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 18 states. [2018-01-21 08:43:02,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:02,537 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 08:43:02,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 08:43:02,538 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 119 [2018-01-21 08:43:02,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:02,540 INFO L225 Difference]: With dead ends: 234 [2018-01-21 08:43:02,540 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 08:43:02,541 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 445 SyntacticMatches, 13 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1490, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 08:43:02,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 08:43:02,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 131. [2018-01-21 08:43:02,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 08:43:02,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 08:43:02,558 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-21 08:43:02,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:02,558 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 08:43:02,559 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:43:02,559 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 08:43:02,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-21 08:43:02,561 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:02,562 INFO L322 BasicCegarLoop]: trace histogram [22, 17, 17, 17, 17, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:02,562 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:02,562 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 6 times [2018-01-21 08:43:02,562 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:02,563 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:02,563 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:02,563 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:02,563 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:02,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:02,593 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:02,704 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 08:43:02,704 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:02,704 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:02,704 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:02,705 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:02,705 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:02,705 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:02,710 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:02,710 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:02,721 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,729 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,731 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,735 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,738 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,742 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,746 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,751 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,753 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:02,762 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:02,785 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 08:43:02,785 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:02,869 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 08:43:02,889 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:02,889 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:02,892 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:02,892 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:02,907 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,915 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,931 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:02,978 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:03,008 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:03,045 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:03,136 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:03,307 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:03,328 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:03,333 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:03,349 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 08:43:03,349 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:03,386 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 08:43:03,388 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:03,389 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-01-21 08:43:03,389 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:03,389 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 08:43:03,389 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 08:43:03,390 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:43:03,390 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 9 states. [2018-01-21 08:43:03,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:03,462 INFO L93 Difference]: Finished difference Result 208 states and 233 transitions. [2018-01-21 08:43:03,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 08:43:03,462 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 160 [2018-01-21 08:43:03,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:03,463 INFO L225 Difference]: With dead ends: 208 [2018-01-21 08:43:03,463 INFO L226 Difference]: Without dead ends: 175 [2018-01-21 08:43:03,464 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 633 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:43:03,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-01-21 08:43:03,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 140. [2018-01-21 08:43:03,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-01-21 08:43:03,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 156 transitions. [2018-01-21 08:43:03,475 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 156 transitions. Word has length 160 [2018-01-21 08:43:03,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:03,475 INFO L432 AbstractCegarLoop]: Abstraction has 140 states and 156 transitions. [2018-01-21 08:43:03,475 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 08:43:03,475 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 156 transitions. [2018-01-21 08:43:03,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-01-21 08:43:03,477 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:03,477 INFO L322 BasicCegarLoop]: trace histogram [27, 21, 21, 21, 21, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:03,477 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:03,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1727385407, now seen corresponding path program 7 times [2018-01-21 08:43:03,478 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:03,479 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:03,479 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:03,479 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:03,479 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:03,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:03,510 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:03,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1392 trivial. 0 not checked. [2018-01-21 08:43:03,670 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:03,670 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:03,670 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:03,670 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:03,670 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:03,670 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:03,675 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:03,675 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:03,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:03,727 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:03,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 995 proven. 38 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2018-01-21 08:43:03,874 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:04,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 311 proven. 240 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2018-01-21 08:43:04,093 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:04,093 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:04,096 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:04,096 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:04,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:04,175 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:04,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 995 proven. 38 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2018-01-21 08:43:04,197 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:04,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 311 proven. 240 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2018-01-21 08:43:04,333 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:04,333 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12, 12, 12] total 24 [2018-01-21 08:43:04,333 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:04,334 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 08:43:04,334 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 08:43:04,334 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2018-01-21 08:43:04,334 INFO L87 Difference]: Start difference. First operand 140 states and 156 transitions. Second operand 19 states. [2018-01-21 08:43:04,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:04,627 INFO L93 Difference]: Finished difference Result 363 states and 408 transitions. [2018-01-21 08:43:04,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:43:04,628 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 191 [2018-01-21 08:43:04,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:04,631 INFO L225 Difference]: With dead ends: 363 [2018-01-21 08:43:04,631 INFO L226 Difference]: Without dead ends: 280 [2018-01-21 08:43:04,632 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 782 GetRequests, 737 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=238, Invalid=952, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 08:43:04,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2018-01-21 08:43:04,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 180. [2018-01-21 08:43:04,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 08:43:04,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-21 08:43:04,648 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 191 [2018-01-21 08:43:04,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:04,648 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-21 08:43:04,648 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 08:43:04,648 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-21 08:43:04,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-21 08:43:04,651 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:04,651 INFO L322 BasicCegarLoop]: trace histogram [36, 29, 29, 29, 29, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:04,651 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:04,651 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 8 times [2018-01-21 08:43:04,651 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:04,652 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:04,652 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:04,652 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:04,652 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:04,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:04,680 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:04,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-01-21 08:43:04,890 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:04,890 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:04,891 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:04,891 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:04,891 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:04,891 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:04,896 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:43:04,896 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:04,912 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:04,938 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:04,943 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:04,947 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:05,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 08:43:05,111 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:05,395 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 08:43:05,415 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:05,415 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:05,418 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:43:05,418 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:05,438 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:05,480 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:05,513 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:05,520 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:05,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 08:43:05,563 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:05,768 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 08:43:05,770 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:05,770 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-21 08:43:05,770 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:05,770 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 08:43:05,771 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 08:43:05,771 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-21 08:43:05,771 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-21 08:43:06,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:06,157 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-21 08:43:06,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 08:43:06,157 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-21 08:43:06,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:06,159 INFO L225 Difference]: With dead ends: 460 [2018-01-21 08:43:06,159 INFO L226 Difference]: Without dead ends: 365 [2018-01-21 08:43:06,160 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 08:43:06,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-21 08:43:06,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-21 08:43:06,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-21 08:43:06,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-21 08:43:06,176 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-21 08:43:06,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:06,176 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-21 08:43:06,176 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 08:43:06,176 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-21 08:43:06,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-21 08:43:06,178 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:06,178 INFO L322 BasicCegarLoop]: trace histogram [46, 38, 38, 38, 38, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:06,178 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:06,178 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 9 times [2018-01-21 08:43:06,178 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:06,179 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:06,179 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:06,179 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:06,179 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:06,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:06,209 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:06,477 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 4291 trivial. 0 not checked. [2018-01-21 08:43:06,478 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:06,478 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:06,478 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:06,478 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:06,478 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:06,478 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:06,485 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:06,485 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:06,506 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,510 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,513 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,517 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,523 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,529 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,537 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,543 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:06,547 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:06,552 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:06,762 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 08:43:06,762 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:07,173 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 08:43:07,194 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:07,194 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:07,199 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:07,200 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:07,228 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,239 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,258 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,285 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,326 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,393 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,508 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,719 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:07,741 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:07,748 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:07,790 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 08:43:07,790 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:07,985 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 1173 proven. 87 refuted. 0 times theorem prover too weak. 3187 trivial. 0 not checked. [2018-01-21 08:43:07,986 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:07,987 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12, 12, 12] total 29 [2018-01-21 08:43:07,987 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:07,987 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 08:43:07,987 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 08:43:07,987 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=596, Unknown=0, NotChecked=0, Total=812 [2018-01-21 08:43:07,988 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 19 states. [2018-01-21 08:43:08,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:08,316 INFO L93 Difference]: Finished difference Result 535 states and 610 transitions. [2018-01-21 08:43:08,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 08:43:08,317 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 298 [2018-01-21 08:43:08,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:08,320 INFO L225 Difference]: With dead ends: 535 [2018-01-21 08:43:08,320 INFO L226 Difference]: Without dead ends: 490 [2018-01-21 08:43:08,321 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1208 GetRequests, 1172 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=342, Invalid=918, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 08:43:08,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2018-01-21 08:43:08,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 283. [2018-01-21 08:43:08,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2018-01-21 08:43:08,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 322 transitions. [2018-01-21 08:43:08,346 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 322 transitions. Word has length 298 [2018-01-21 08:43:08,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:08,347 INFO L432 AbstractCegarLoop]: Abstraction has 283 states and 322 transitions. [2018-01-21 08:43:08,347 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 08:43:08,347 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 322 transitions. [2018-01-21 08:43:08,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-21 08:43:08,350 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:08,350 INFO L322 BasicCegarLoop]: trace histogram [57, 48, 48, 48, 48, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:08,350 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:08,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 10 times [2018-01-21 08:43:08,351 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:08,351 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:08,352 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:08,352 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:08,352 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:08,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:08,395 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:08,779 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 6720 trivial. 0 not checked. [2018-01-21 08:43:08,779 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:08,780 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:08,780 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:08,780 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:08,780 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:08,780 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:08,785 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:08,785 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:08,860 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:08,866 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:09,103 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 4094 proven. 119 refuted. 0 times theorem prover too weak. 2705 trivial. 0 not checked. [2018-01-21 08:43:09,103 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:09,586 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1298 proven. 675 refuted. 0 times theorem prover too weak. 4945 trivial. 0 not checked. [2018-01-21 08:43:09,606 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:09,606 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:09,616 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:09,616 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:09,729 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:09,738 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:09,801 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 4094 proven. 119 refuted. 0 times theorem prover too weak. 2705 trivial. 0 not checked. [2018-01-21 08:43:09,801 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:10,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1298 proven. 675 refuted. 0 times theorem prover too weak. 4945 trivial. 0 not checked. [2018-01-21 08:43:10,023 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:10,024 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 18, 18, 18, 18] total 36 [2018-01-21 08:43:10,024 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:10,024 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 08:43:10,024 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 08:43:10,025 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1024, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 08:43:10,025 INFO L87 Difference]: Start difference. First operand 283 states and 322 transitions. Second operand 28 states. [2018-01-21 08:43:10,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:10,644 INFO L93 Difference]: Finished difference Result 722 states and 827 transitions. [2018-01-21 08:43:10,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 08:43:10,644 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 359 [2018-01-21 08:43:10,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:10,646 INFO L225 Difference]: With dead ends: 722 [2018-01-21 08:43:10,646 INFO L226 Difference]: Without dead ends: 593 [2018-01-21 08:43:10,648 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1463 GetRequests, 1394 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=505, Invalid=2251, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 08:43:10,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2018-01-21 08:43:10,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 338. [2018-01-21 08:43:10,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-21 08:43:10,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 382 transitions. [2018-01-21 08:43:10,673 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 382 transitions. Word has length 359 [2018-01-21 08:43:10,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:10,674 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 382 transitions. [2018-01-21 08:43:10,674 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 08:43:10,674 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 382 transitions. [2018-01-21 08:43:10,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2018-01-21 08:43:10,678 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:10,678 INFO L322 BasicCegarLoop]: trace histogram [68, 58, 58, 58, 58, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:10,678 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:10,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1447339731, now seen corresponding path program 11 times [2018-01-21 08:43:10,678 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:10,679 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:10,679 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:10,679 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:10,680 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:10,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:10,726 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:11,076 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 9695 trivial. 0 not checked. [2018-01-21 08:43:11,076 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:11,076 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:11,077 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:11,077 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:11,077 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:11,077 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:11,084 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:11,085 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:11,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,132 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,148 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,165 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,204 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,210 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,216 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:11,217 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:11,225 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:11,531 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5758 proven. 500 refuted. 0 times theorem prover too weak. 3682 trivial. 0 not checked. [2018-01-21 08:43:11,531 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:12,005 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 874 proven. 2168 refuted. 0 times theorem prover too weak. 6898 trivial. 0 not checked. [2018-01-21 08:43:12,031 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:12,036 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:12,039 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:12,039 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:12,074 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,087 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,153 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,197 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,252 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,319 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,476 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:12,500 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:12,510 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:12,587 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5758 proven. 500 refuted. 0 times theorem prover too weak. 3682 trivial. 0 not checked. [2018-01-21 08:43:12,587 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:12,861 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 874 proven. 2168 refuted. 0 times theorem prover too weak. 6898 trivial. 0 not checked. [2018-01-21 08:43:12,862 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:12,863 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 40 [2018-01-21 08:43:12,863 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:12,864 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 08:43:12,864 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 08:43:12,864 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1326, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 08:43:12,864 INFO L87 Difference]: Start difference. First operand 338 states and 382 transitions. Second operand 30 states. [2018-01-21 08:43:14,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:14,242 INFO L93 Difference]: Finished difference Result 804 states and 906 transitions. [2018-01-21 08:43:14,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 08:43:14,242 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 420 [2018-01-21 08:43:14,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:14,245 INFO L225 Difference]: With dead ends: 804 [2018-01-21 08:43:14,246 INFO L226 Difference]: Without dead ends: 458 [2018-01-21 08:43:14,249 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1645 SyntacticMatches, 18 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 08:43:14,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2018-01-21 08:43:14,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 339. [2018-01-21 08:43:14,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-01-21 08:43:14,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 376 transitions. [2018-01-21 08:43:14,277 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 376 transitions. Word has length 420 [2018-01-21 08:43:14,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:14,278 INFO L432 AbstractCegarLoop]: Abstraction has 339 states and 376 transitions. [2018-01-21 08:43:14,278 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 08:43:14,278 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 376 transitions. [2018-01-21 08:43:14,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2018-01-21 08:43:14,282 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:14,282 INFO L322 BasicCegarLoop]: trace histogram [78, 67, 67, 67, 67, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:14,282 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:14,282 INFO L82 PathProgramCache]: Analyzing trace with hash 593814198, now seen corresponding path program 12 times [2018-01-21 08:43:14,282 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:14,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:14,283 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:14,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:14,284 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:14,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:14,333 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:14,903 INFO L134 CoverageAnalysis]: Checked inductivity of 13156 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 12859 trivial. 0 not checked. [2018-01-21 08:43:14,904 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:14,904 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:14,904 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:14,904 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:14,904 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:14,904 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:14,911 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:14,912 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:14,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,960 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,967 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,973 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,981 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,988 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:14,996 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,006 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,018 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,031 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,043 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,056 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,068 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,081 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,092 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,104 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,113 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,124 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,126 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:15,132 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:15,351 INFO L134 CoverageAnalysis]: Checked inductivity of 13156 backedges. 2730 proven. 156 refuted. 0 times theorem prover too weak. 10270 trivial. 0 not checked. [2018-01-21 08:43:15,351 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:15,861 INFO L134 CoverageAnalysis]: Checked inductivity of 13156 backedges. 2730 proven. 156 refuted. 0 times theorem prover too weak. 10270 trivial. 0 not checked. [2018-01-21 08:43:15,881 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:15,881 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:15,885 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:15,885 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:15,923 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,934 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,956 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:15,984 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:16,037 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:16,175 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:16,591 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:20,270 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,308 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:44,369 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown