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_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:06:35,192 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:06:35,194 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:06:35,208 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:06:35,208 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:06:35,209 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:06:35,210 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:06:35,212 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:06:35,214 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:06:35,215 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:06:35,216 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:06:35,217 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:06:35,218 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:06:35,219 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:06:35,220 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:06:35,222 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:06:35,224 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:06:35,226 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:06:35,228 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:06:35,229 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:06:35,231 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:06:35,231 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:06:35,232 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:06:35,233 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:06:35,234 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:06:35,235 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:06:35,235 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:06:35,236 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:06:35,236 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:06:35,236 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:06:35,237 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:06:35,238 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_precise.epf [2018-01-21 06:06:35,248 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:06:35,248 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:06:35,249 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:06:35,249 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:06:35,249 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:06:35,249 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:06:35,250 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:06:35,250 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:06:35,251 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:06:35,251 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:06:35,251 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:06:35,251 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:06:35,251 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:06:35,251 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:06:35,252 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:06:35,252 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:06:35,252 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:06:35,252 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:06:35,252 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:06:35,252 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:06:35,253 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:06:35,253 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:06:35,253 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:06:35,253 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:06:35,253 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:06:35,254 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:06:35,254 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:06:35,254 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:06:35,254 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:06:35,255 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:06:35,255 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:06:35,255 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:06:35,255 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:06:35,255 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:06:35,255 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:06:35,256 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:06:35,256 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:06:35,257 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:06:35,257 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:06:35,290 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:06:35,301 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:06:35,305 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:06:35,306 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:06:35,307 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:06:35,307 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-21 06:06:35,465 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:06:35,471 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:06:35,472 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:06:35,472 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:06:35,478 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:06:35,479 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,482 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5530d006 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35, skipping insertion in model container [2018-01-21 06:06:35,482 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,501 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:06:35,522 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:06:35,644 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:06:35,661 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:06:35,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35 WrapperNode [2018-01-21 06:06:35,667 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:06:35,668 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:06:35,668 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:06:35,668 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:06:35,680 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,689 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,692 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,695 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,696 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (1/1) ... [2018-01-21 06:06:35,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:06:35,699 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:06:35,699 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:06:35,699 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:06:35,700 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (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 06:06:35,750 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:06:35,750 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:06:35,750 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:06:35,750 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:06:35,750 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:06:35,750 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:06:35,751 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:06:35,751 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:06:35,751 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:06:35,751 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:06:35,751 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:06:35,751 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:06:35,752 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:06:35,940 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:06:35,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:06:35 BoogieIcfgContainer [2018-01-21 06:06:35,940 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:06:35,941 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:06:35,941 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:06:35,943 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:06:35,943 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:06:35" (1/3) ... [2018-01-21 06:06:35,944 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322bcf18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:06:35, skipping insertion in model container [2018-01-21 06:06:35,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:35" (2/3) ... [2018-01-21 06:06:35,944 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@322bcf18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:06:35, skipping insertion in model container [2018-01-21 06:06:35,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:06:35" (3/3) ... [2018-01-21 06:06:35,946 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-21 06:06:35,953 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:06:35,959 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:06:36,005 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:06:36,005 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:06:36,006 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:06:36,006 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:06:36,006 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:06:36,006 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:06:36,006 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:06:36,006 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:06:36,007 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:06:36,027 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:06:36,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:06:36,032 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:36,034 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:06:36,034 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:06:36,038 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 06:06:36,040 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:36,080 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,080 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:36,080 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,081 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:36,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:06:36,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:06:36,134 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:06:36,140 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:06:36,146 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:06:36,146 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:06:36,146 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:06:36,146 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:06:36,146 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:06:36,146 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:06:36,147 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:06:36,147 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:06:36,147 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:06:36,149 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:06:36,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:06:36,150 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:36,151 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:36,151 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:06:36,151 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 06:06:36,151 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:36,152 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,152 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:36,153 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,153 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:36,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:36,179 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:36,213 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 06:06:36,215 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:06:36,215 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:06:36,215 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:36,217 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:06:36,228 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:06:36,229 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:06:36,231 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:06:36,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:36,254 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:06:36,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:06:36,256 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:06:36,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:36,263 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:06:36,263 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:06:36,266 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 06:06:36,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:06:36,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:06:36,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:06:36,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:06:36,371 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:06:36,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:36,371 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:06:36,371 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:06:36,371 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:06:36,371 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:06:36,374 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:06:36,374 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:06:36,374 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:06:36,374 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:06:36,374 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:06:36,374 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:06:36,374 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:06:36,374 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:06:36,375 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:06:36,376 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:06:36,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:06:36,377 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:36,377 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 06:06:36,377 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:36,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 06:06:36,378 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:36,378 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,379 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:36,379 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,379 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:36,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:36,389 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:36,402 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 06:06:36,403 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:06:36,403 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:06:36,403 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:36,403 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:06:36,404 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:06:36,404 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:06:36,404 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:06:36,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:36,411 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:06:36,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:06:36,411 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:06:36,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:36,413 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:06:36,414 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:06:36,414 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 06:06:36,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:06:36,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:06:36,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:06:36,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 06:06:36,425 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 06:06:36,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:36,425 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 06:06:36,425 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:06:36,425 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 06:06:36,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:06:36,426 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:36,426 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 06:06:36,426 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:36,426 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 06:06:36,426 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:36,427 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,427 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:36,427 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,428 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:36,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:36,437 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:36,470 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 06:06:36,471 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:06:36,471 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:06:36,471 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:36,472 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:06:36,472 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:06:36,472 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:06:36,472 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 06:06:36,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:36,535 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 06:06:36,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:06:36,535 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:06:36,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:36,539 INFO L225 Difference]: With dead ends: 66 [2018-01-21 06:06:36,539 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:06:36,540 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 06:06:36,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:06:36,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 06:06:36,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:06:36,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 06:06:36,551 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 06:06:36,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:36,552 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 06:06:36,552 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:06:36,552 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 06:06:36,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:06:36,553 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:36,553 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 06:06:36,554 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:36,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 06:06:36,554 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:36,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,555 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:36,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,555 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:36,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:36,579 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:36,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:36,738 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:36,738 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:36,738 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 06:06:36,740 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 06:06:36,787 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:06:36,787 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:06:39,155 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:06:39,157 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 17 variables. [2018-01-21 06:06:39,169 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:06:39,169 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:39,169 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 06:06:39,183 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:39,183 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:39,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:39,213 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:39,296 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 06:06:39,296 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:39,467 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 06:06:39,503 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:06:39,503 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [8] total 12 [2018-01-21 06:06:39,503 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:39,504 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:06:39,504 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:06:39,504 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2018-01-21 06:06:39,504 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 06:06:39,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:39,604 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 06:06:39,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:06:39,605 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 06:06:39,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:39,606 INFO L225 Difference]: With dead ends: 80 [2018-01-21 06:06:39,607 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 06:06:39,607 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2018-01-21 06:06:39,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 06:06:39,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 06:06:39,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 06:06:39,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 06:06:39,613 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 06:06:39,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:39,614 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 06:06:39,614 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:06:39,614 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 06:06:39,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 06:06:39,615 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:39,615 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 06:06:39,616 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:39,616 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 06:06:39,617 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:39,618 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:39,618 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:39,618 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:39,618 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:39,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:39,634 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:39,684 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 06:06:39,684 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:39,684 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:39,684 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 06:06:39,684 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 06:06:39,686 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:06:39,686 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:06:41,363 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:06:41,363 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 06:06:41,375 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:06:41,375 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:41,376 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:41,384 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:41,384 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:41,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:41,404 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:41,415 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 06:06:41,415 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:41,457 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 06:06:41,490 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:41,491 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:41,497 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:41,497 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:41,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:41,531 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:41,537 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 06:06:41,537 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:41,583 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 06:06:41,585 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:41,585 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 06:06:41,585 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:41,586 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:06:41,586 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:06:41,586 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:06:41,586 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 5 states. [2018-01-21 06:06:41,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:41,674 INFO L93 Difference]: Finished difference Result 84 states and 94 transitions. [2018-01-21 06:06:41,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:06:41,674 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-01-21 06:06:41,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:41,676 INFO L225 Difference]: With dead ends: 84 [2018-01-21 06:06:41,676 INFO L226 Difference]: Without dead ends: 67 [2018-01-21 06:06:41,677 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 141 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 06:06:41,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-01-21 06:06:41,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 52. [2018-01-21 06:06:41,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 06:06:41,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2018-01-21 06:06:41,684 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 36 [2018-01-21 06:06:41,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:41,685 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2018-01-21 06:06:41,685 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:06:41,685 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2018-01-21 06:06:41,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 06:06:41,687 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:41,687 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:41,688 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:41,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1862415341, now seen corresponding path program 2 times [2018-01-21 06:06:41,688 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:41,689 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:41,689 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:41,689 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:41,689 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:41,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:41,708 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:41,766 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 06:06:41,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:41,767 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:41,767 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:41,767 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:41,767 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:41,768 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:41,776 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:41,776 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:41,791 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:41,802 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:41,804 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:41,807 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:41,872 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 06:06:41,872 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:42,290 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 06:06:42,311 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:42,312 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:42,316 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:42,316 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:42,331 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:42,355 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:42,370 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:42,376 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:42,395 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 06:06:42,395 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:42,456 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 06:06:42,458 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:42,458 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 06:06:42,458 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:42,458 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:06:42,458 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:06:42,459 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 06:06:42,459 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 10 states. [2018-01-21 06:06:42,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:42,610 INFO L93 Difference]: Finished difference Result 148 states and 168 transitions. [2018-01-21 06:06:42,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 06:06:42,615 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 52 [2018-01-21 06:06:42,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:42,617 INFO L225 Difference]: With dead ends: 148 [2018-01-21 06:06:42,617 INFO L226 Difference]: Without dead ends: 111 [2018-01-21 06:06:42,617 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:06:42,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-01-21 06:06:42,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 77. [2018-01-21 06:06:42,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 06:06:42,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-01-21 06:06:42,627 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 52 [2018-01-21 06:06:42,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:42,628 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-01-21 06:06:42,628 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:06:42,628 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-01-21 06:06:42,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-01-21 06:06:42,630 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:42,631 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 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 06:06:42,631 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:42,631 INFO L82 PathProgramCache]: Analyzing trace with hash 298957008, now seen corresponding path program 3 times [2018-01-21 06:06:42,631 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:42,632 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:42,632 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:42,632 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:42,632 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:42,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:42,655 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:42,738 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 06:06:42,738 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:42,738 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:42,738 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:42,738 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:42,739 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:42,739 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:42,744 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:42,744 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:42,756 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:42,760 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:42,766 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:42,771 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:42,778 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:42,781 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:42,832 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-21 06:06:42,832 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:42,973 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-21 06:06:42,994 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:42,994 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:42,997 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:42,998 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:43,011 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:43,021 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:43,039 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:43,062 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:43,072 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:43,077 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:43,091 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 06:06:43,091 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:43,132 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 06:06:43,134 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:43,134 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 06:06:43,134 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:43,135 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:06:43,135 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:06:43,135 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:06:43,135 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 10 states. [2018-01-21 06:06:43,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:43,270 INFO L93 Difference]: Finished difference Result 194 states and 220 transitions. [2018-01-21 06:06:43,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 06:06:43,270 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 78 [2018-01-21 06:06:43,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:43,271 INFO L225 Difference]: With dead ends: 194 [2018-01-21 06:06:43,271 INFO L226 Difference]: Without dead ends: 169 [2018-01-21 06:06:43,272 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 298 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:06:43,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-01-21 06:06:43,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 115. [2018-01-21 06:06:43,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 06:06:43,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 130 transitions. [2018-01-21 06:06:43,282 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 130 transitions. Word has length 78 [2018-01-21 06:06:43,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:43,283 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 130 transitions. [2018-01-21 06:06:43,283 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:06:43,283 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 130 transitions. [2018-01-21 06:06:43,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-01-21 06:06:43,284 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:43,284 INFO L322 BasicCegarLoop]: trace histogram [13, 9, 9, 9, 9, 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 06:06:43,284 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:43,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1844537761, now seen corresponding path program 4 times [2018-01-21 06:06:43,285 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:43,285 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:43,285 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:43,285 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:43,285 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:43,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:43,312 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:43,455 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 06:06:43,456 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:43,456 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:43,456 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:43,456 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:43,456 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:43,456 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:43,465 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:43,465 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:43,499 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:43,504 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:43,630 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 06:06:43,630 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:43,787 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 06:06:43,807 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:43,807 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:43,811 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:43,812 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:43,851 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:43,856 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:43,870 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 06:06:43,871 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:44,039 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 06:06:44,040 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:44,041 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 11, 11, 11] total 20 [2018-01-21 06:06:44,041 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:44,041 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 06:06:44,041 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 06:06:44,041 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:06:44,042 INFO L87 Difference]: Start difference. First operand 115 states and 130 transitions. Second operand 16 states. [2018-01-21 06:06:44,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:44,318 INFO L93 Difference]: Finished difference Result 311 states and 357 transitions. [2018-01-21 06:06:44,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 06:06:44,318 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2018-01-21 06:06:44,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:44,322 INFO L225 Difference]: With dead ends: 311 [2018-01-21 06:06:44,322 INFO L226 Difference]: Without dead ends: 241 [2018-01-21 06:06:44,323 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 411 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2018-01-21 06:06:44,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-01-21 06:06:44,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 150. [2018-01-21 06:06:44,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-01-21 06:06:44,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 169 transitions. [2018-01-21 06:06:44,343 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 169 transitions. Word has length 109 [2018-01-21 06:06:44,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:44,343 INFO L432 AbstractCegarLoop]: Abstraction has 150 states and 169 transitions. [2018-01-21 06:06:44,343 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 06:06:44,344 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 169 transitions. [2018-01-21 06:06:44,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-01-21 06:06:44,347 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:44,347 INFO L322 BasicCegarLoop]: trace histogram [18, 13, 13, 13, 13, 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 06:06:44,347 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:44,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1349347824, now seen corresponding path program 5 times [2018-01-21 06:06:44,347 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:44,348 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:44,348 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:44,348 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:44,348 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:44,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:44,376 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:44,489 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 580 trivial. 0 not checked. [2018-01-21 06:06:44,490 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:44,490 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:44,490 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:44,490 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:44,490 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:44,490 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:44,496 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:44,496 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:44,509 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,511 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,512 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,515 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,521 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,538 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,545 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:44,549 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:44,668 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-21 06:06:44,669 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:44,927 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-21 06:06:44,959 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:44,959 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:44,963 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:44,964 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:44,978 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,983 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:44,992 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:45,005 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:45,025 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:45,046 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:45,058 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:45,063 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:45,079 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-21 06:06:45,079 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:45,233 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-21 06:06:45,235 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:45,235 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11, 11, 11] total 22 [2018-01-21 06:06:45,235 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:45,236 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 06:06:45,236 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 06:06:45,236 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:06:45,236 INFO L87 Difference]: Start difference. First operand 150 states and 169 transitions. Second operand 17 states. [2018-01-21 06:06:45,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:45,634 INFO L93 Difference]: Finished difference Result 336 states and 379 transitions. [2018-01-21 06:06:45,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:06:45,635 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 140 [2018-01-21 06:06:45,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:45,636 INFO L225 Difference]: With dead ends: 336 [2018-01-21 06:06:45,636 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 06:06:45,637 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 539 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=243, Invalid=1089, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 06:06:45,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 06:06:45,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 151. [2018-01-21 06:06:45,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-01-21 06:06:45,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 166 transitions. [2018-01-21 06:06:45,651 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 166 transitions. Word has length 140 [2018-01-21 06:06:45,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:45,651 INFO L432 AbstractCegarLoop]: Abstraction has 151 states and 166 transitions. [2018-01-21 06:06:45,651 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 06:06:45,652 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 166 transitions. [2018-01-21 06:06:45,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-01-21 06:06:45,654 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:45,655 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 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 06:06:45,655 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:45,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1936414061, now seen corresponding path program 6 times [2018-01-21 06:06:45,655 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:45,656 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:45,656 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:45,656 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:45,656 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:45,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:45,680 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:45,809 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 06:06:45,809 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:45,809 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:45,809 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:45,809 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:45,809 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:45,809 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:45,816 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:45,816 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:45,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,834 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,837 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,839 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,843 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,847 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,852 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,855 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:45,861 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:45,864 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:45,897 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 06:06:45,897 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:46,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 06:06:46,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:46,040 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:46,043 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:46,043 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:46,058 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,068 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,081 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,098 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,119 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,146 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,182 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,285 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,415 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:46,436 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:46,441 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:46,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 06:06:46,459 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:46,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 06:06:46,504 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:46,504 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 06:06:46,504 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:46,504 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:06:46,504 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:06:46,505 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:06:46,505 INFO L87 Difference]: Start difference. First operand 151 states and 166 transitions. Second operand 10 states. [2018-01-21 06:06:46,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:46,576 INFO L93 Difference]: Finished difference Result 237 states and 264 transitions. [2018-01-21 06:06:46,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:06:46,577 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 176 [2018-01-21 06:06:46,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:46,579 INFO L225 Difference]: With dead ends: 237 [2018-01-21 06:06:46,579 INFO L226 Difference]: Without dead ends: 200 [2018-01-21 06:06:46,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 696 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:06:46,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-01-21 06:06:46,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 160. [2018-01-21 06:06:46,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-01-21 06:06:46,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 177 transitions. [2018-01-21 06:06:46,591 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 177 transitions. Word has length 176 [2018-01-21 06:06:46,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:46,592 INFO L432 AbstractCegarLoop]: Abstraction has 160 states and 177 transitions. [2018-01-21 06:06:46,592 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:06:46,592 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 177 transitions. [2018-01-21 06:06:46,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-01-21 06:06:46,593 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:46,594 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 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 06:06:46,594 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:46,594 INFO L82 PathProgramCache]: Analyzing trace with hash -984621276, now seen corresponding path program 7 times [2018-01-21 06:06:46,594 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:46,595 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:46,595 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:46,595 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:46,595 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:46,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:46,621 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:46,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-21 06:06:46,735 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:46,735 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:46,735 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:46,735 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:46,735 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:46,735 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:46,740 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:46,740 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:46,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:46,788 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:46,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-21 06:06:46,925 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:47,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-21 06:06:47,153 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:47,153 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:47,156 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:47,156 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:47,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:47,238 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:47,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-21 06:06:47,264 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:47,461 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-21 06:06:47,463 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:47,463 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 06:06:47,463 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:47,463 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:06:47,464 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:06:47,464 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 06:06:47,464 INFO L87 Difference]: Start difference. First operand 160 states and 177 transitions. Second operand 21 states. [2018-01-21 06:06:47,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:47,884 INFO L93 Difference]: Finished difference Result 392 states and 439 transitions. [2018-01-21 06:06:47,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 06:06:47,884 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 207 [2018-01-21 06:06:47,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:47,887 INFO L225 Difference]: With dead ends: 392 [2018-01-21 06:06:47,887 INFO L226 Difference]: Without dead ends: 305 [2018-01-21 06:06:47,888 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 798 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:06:47,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-01-21 06:06:47,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 200. [2018-01-21 06:06:47,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-01-21 06:06:47,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-01-21 06:06:47,903 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 207 [2018-01-21 06:06:47,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:47,903 INFO L432 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-01-21 06:06:47,903 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:06:47,903 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-01-21 06:06:47,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-01-21 06:06:47,907 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:47,907 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 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 06:06:47,908 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:47,908 INFO L82 PathProgramCache]: Analyzing trace with hash 446009255, now seen corresponding path program 8 times [2018-01-21 06:06:47,908 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:47,909 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:47,909 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:47,909 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:47,909 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:47,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:47,943 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:48,123 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 06:06:48,123 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:48,123 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:48,123 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:48,123 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:48,123 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:48,124 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:48,128 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:48,129 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:48,144 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:48,167 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:48,172 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:48,176 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:48,316 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-21 06:06:48,316 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:48,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-21 06:06:48,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:48,616 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:48,619 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:48,619 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:48,639 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:48,688 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:48,723 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:48,731 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:48,771 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-21 06:06:48,771 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:48,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-21 06:06:48,959 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:48,959 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 06:06:48,959 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:48,959 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 06:06:48,960 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 06:06:48,960 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 06:06:48,960 INFO L87 Difference]: Start difference. First operand 200 states and 222 transitions. Second operand 24 states. [2018-01-21 06:06:49,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:49,379 INFO L93 Difference]: Finished difference Result 489 states and 547 transitions. [2018-01-21 06:06:49,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 06:06:49,379 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 258 [2018-01-21 06:06:49,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:49,382 INFO L225 Difference]: With dead ends: 489 [2018-01-21 06:06:49,382 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 06:06:49,383 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1055 GetRequests, 997 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 06:06:49,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 06:06:49,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 245. [2018-01-21 06:06:49,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-01-21 06:06:49,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 273 transitions. [2018-01-21 06:06:49,397 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 273 transitions. Word has length 258 [2018-01-21 06:06:49,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:49,398 INFO L432 AbstractCegarLoop]: Abstraction has 245 states and 273 transitions. [2018-01-21 06:06:49,398 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 06:06:49,398 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 273 transitions. [2018-01-21 06:06:49,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-01-21 06:06:49,399 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:49,399 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 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 06:06:49,399 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:49,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1567268592, now seen corresponding path program 9 times [2018-01-21 06:06:49,400 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:49,401 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:49,401 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:49,401 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:49,401 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:49,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:49,429 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:49,756 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 06:06:49,756 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:49,756 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:49,756 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:49,756 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:49,757 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:49,757 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:49,762 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:49,762 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:49,785 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,792 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,795 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,798 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,803 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,811 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,816 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:49,817 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:49,824 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:50,022 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 06:06:50,023 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:50,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 06:06:50,472 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:50,472 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:50,475 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:50,475 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:50,504 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:50,514 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:50,532 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:50,554 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:50,609 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:50,722 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:50,965 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:51,387 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:51,412 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:51,420 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:51,479 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 06:06:51,479 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:51,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 06:06:51,696 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:51,696 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 06:06:51,696 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:51,697 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 06:06:51,697 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 06:06:51,698 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 06:06:51,698 INFO L87 Difference]: Start difference. First operand 245 states and 273 transitions. Second operand 20 states. [2018-01-21 06:06:52,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:52,110 INFO L93 Difference]: Finished difference Result 564 states and 641 transitions. [2018-01-21 06:06:52,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 06:06:52,110 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 314 [2018-01-21 06:06:52,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:52,113 INFO L225 Difference]: With dead ends: 564 [2018-01-21 06:06:52,113 INFO L226 Difference]: Without dead ends: 515 [2018-01-21 06:06:52,114 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1236 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 06:06:52,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2018-01-21 06:06:52,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 303. [2018-01-21 06:06:52,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-01-21 06:06:52,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 343 transitions. [2018-01-21 06:06:52,139 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 343 transitions. Word has length 314 [2018-01-21 06:06:52,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:52,140 INFO L432 AbstractCegarLoop]: Abstraction has 303 states and 343 transitions. [2018-01-21 06:06:52,140 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 06:06:52,140 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 343 transitions. [2018-01-21 06:06:52,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-01-21 06:06:52,143 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:52,143 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 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 06:06:52,143 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:52,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1827967461, now seen corresponding path program 10 times [2018-01-21 06:06:52,143 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:52,144 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:52,144 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:52,144 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:52,144 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:52,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:52,183 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:52,496 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-21 06:06:52,496 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:52,496 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:52,496 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:52,496 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:52,496 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:52,496 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:52,501 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:52,501 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:52,572 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:52,577 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:52,797 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-21 06:06:52,797 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:53,185 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-21 06:06:53,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:53,205 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:53,208 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:53,208 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:53,344 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:53,353 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:53,439 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-21 06:06:53,439 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:53,773 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-21 06:06:53,774 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:53,775 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 06:06:53,775 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:53,775 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 06:06:53,776 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 06:06:53,776 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:06:53,776 INFO L87 Difference]: Start difference. First operand 303 states and 343 transitions. Second operand 30 states. [2018-01-21 06:06:55,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:55,196 INFO L93 Difference]: Finished difference Result 751 states and 858 transitions. [2018-01-21 06:06:55,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 06:06:55,196 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 375 [2018-01-21 06:06:55,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:55,199 INFO L225 Difference]: With dead ends: 751 [2018-01-21 06:06:55,200 INFO L226 Difference]: Without dead ends: 618 [2018-01-21 06:06:55,202 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1529 GetRequests, 1455 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 06:06:55,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2018-01-21 06:06:55,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 358. [2018-01-21 06:06:55,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2018-01-21 06:06:55,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 403 transitions. [2018-01-21 06:06:55,230 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 403 transitions. Word has length 375 [2018-01-21 06:06:55,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:55,231 INFO L432 AbstractCegarLoop]: Abstraction has 358 states and 403 transitions. [2018-01-21 06:06:55,231 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 06:06:55,231 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 403 transitions. [2018-01-21 06:06:55,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2018-01-21 06:06:55,234 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:55,235 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 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 06:06:55,235 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:55,235 INFO L82 PathProgramCache]: Analyzing trace with hash -940109232, now seen corresponding path program 11 times [2018-01-21 06:06:55,235 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:55,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:55,236 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:55,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:55,236 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:55,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:55,283 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:55,832 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-21 06:06:55,832 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:55,832 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:55,833 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:55,833 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:55,833 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:55,833 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:55,838 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:55,838 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:55,863 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,867 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,871 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,876 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,882 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,896 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,902 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:55,903 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:55,908 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:56,180 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6200 proven. 517 refuted. 0 times theorem prover too weak. 3763 trivial. 0 not checked. [2018-01-21 06:06:56,180 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:56,809 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 1065 proven. 2348 refuted. 0 times theorem prover too weak. 7067 trivial. 0 not checked. [2018-01-21 06:06:56,829 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:56,829 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:56,832 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:56,832 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:56,859 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:56,869 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:56,892 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:56,930 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,061 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,144 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,248 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,377 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,417 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:57,427 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:57,582 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6116 proven. 427 refuted. 0 times theorem prover too weak. 3937 trivial. 0 not checked. [2018-01-21 06:06:57,582 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:58,073 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 971 proven. 1932 refuted. 0 times theorem prover too weak. 7577 trivial. 0 not checked. [2018-01-21 06:06:58,076 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:58,077 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 47 [2018-01-21 06:06:58,077 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:58,078 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 06:06:58,078 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 06:06:58,078 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1871, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:06:58,079 INFO L87 Difference]: Start difference. First operand 358 states and 403 transitions. Second operand 31 states. [2018-01-21 06:06:59,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:59,871 INFO L93 Difference]: Finished difference Result 835 states and 939 transitions. [2018-01-21 06:06:59,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-01-21 06:06:59,872 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 436 [2018-01-21 06:06:59,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:59,877 INFO L225 Difference]: With dead ends: 835 [2018-01-21 06:06:59,877 INFO L226 Difference]: Without dead ends: 469 [2018-01-21 06:06:59,880 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1785 GetRequests, 1693 SyntacticMatches, 18 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1741 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=906, Invalid=4794, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 06:06:59,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-01-21 06:06:59,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 364. [2018-01-21 06:06:59,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2018-01-21 06:06:59,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 400 transitions. [2018-01-21 06:06:59,909 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 400 transitions. Word has length 436 [2018-01-21 06:06:59,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:59,910 INFO L432 AbstractCegarLoop]: Abstraction has 364 states and 400 transitions. [2018-01-21 06:06:59,910 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 06:06:59,910 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 400 transitions. [2018-01-21 06:06:59,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2018-01-21 06:06:59,914 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:59,914 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:59,914 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:59,915 INFO L82 PathProgramCache]: Analyzing trace with hash 270709555, now seen corresponding path program 12 times [2018-01-21 06:06:59,915 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:59,916 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:59,916 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:59,916 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:59,916 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:59,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:59,965 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:00,661 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-21 06:07:00,662 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:00,662 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:00,662 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:00,662 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:00,662 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:00,662 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:07:00,670 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:00,670 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:00,706 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,712 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,717 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,724 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,751 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,769 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,778 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,789 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,802 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,814 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,828 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,842 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,855 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,865 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,878 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,889 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,899 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,913 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,926 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:00,928 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:00,936 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:01,128 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-21 06:07:01,128 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:01,561 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-21 06:07:01,581 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:01,581 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:07:01,584 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:07:01,584 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:07:01,613 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:01,625 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:01,654 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:01,691 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:01,751 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:01,936 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:02,881 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:06,650 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:07:18,690 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... [2018-01-21 06:07:30,742 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown