java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/memsetNonZero2_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:24:56,599 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:24:56,601 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:24:56,622 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:24:56,622 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:24:56,623 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:24:56,625 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:24:56,626 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:24:56,629 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:24:56,631 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:24:56,632 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:24:56,632 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:24:56,633 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:24:56,634 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:24:56,642 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:24:56,645 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:24:56,647 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:24:56,649 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:24:56,651 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:24:56,652 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:24:56,654 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 03:24:56,655 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 03:24:56,655 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 03:24:56,656 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 03:24:56,657 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 03:24:56,658 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 03:24:56,658 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 03:24:56,659 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 03:24:56,659 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 03:24:56,659 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 03:24:56,660 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 03:24:56,660 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf [2018-01-21 03:24:56,679 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:24:56,680 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:24:56,681 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:24:56,681 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:24:56,681 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:24:56,681 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:24:56,681 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:24:56,682 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:24:56,682 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:24:56,682 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:24:56,683 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:24:56,683 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:24:56,683 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:24:56,683 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:24:56,683 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:24:56,684 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:24:56,684 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:24:56,686 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:24:56,686 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:24:56,686 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:24:56,686 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:24:56,686 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:24:56,687 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:24:56,687 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:24:56,687 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:24:56,687 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:24:56,687 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:24:56,687 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:24:56,688 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:24:56,688 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:24:56,688 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:24:56,688 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:24:56,688 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:24:56,689 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:24:56,689 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:24:56,691 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:24:56,691 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:24:56,692 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:24:56,692 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:24:56,693 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:24:56,746 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:24:56,760 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:24:56,764 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:24:56,765 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:24:56,766 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:24:56,767 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memsetNonZero2_true-valid-memsafety_true-termination.c [2018-01-21 03:24:56,912 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:24:56,920 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:24:56,921 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:24:56,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:24:56,929 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:24:56,931 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:24:56" (1/1) ... [2018-01-21 03:24:56,936 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2145b668 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:56, skipping insertion in model container [2018-01-21 03:24:56,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:24:56" (1/1) ... [2018-01-21 03:24:56,957 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:24:56,976 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:24:57,101 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:24:57,116 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:24:57,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57 WrapperNode [2018-01-21 03:24:57,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:24:57,122 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:24:57,122 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:24:57,123 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:24:57,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,142 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,143 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,144 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,147 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,148 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... [2018-01-21 03:24:57,149 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:24:57,149 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:24:57,150 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:24:57,150 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:24:57,151 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:24:57,199 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:24:57,199 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:24:57,199 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:24:57,199 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:24:57,199 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:24:57,200 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:24:57,200 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-21 03:24:57,200 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-21 03:24:57,200 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-21 03:24:57,200 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:24:57,200 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:24:57,201 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:24:57,317 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:24:57,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:24:57 BoogieIcfgContainer [2018-01-21 03:24:57,318 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:24:57,318 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:24:57,318 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:24:57,320 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:24:57,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:24:56" (1/3) ... [2018-01-21 03:24:57,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@316accce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:24:57, skipping insertion in model container [2018-01-21 03:24:57,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:24:57" (2/3) ... [2018-01-21 03:24:57,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@316accce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:24:57, skipping insertion in model container [2018-01-21 03:24:57,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:24:57" (3/3) ... [2018-01-21 03:24:57,324 INFO L105 eAbstractionObserver]: Analyzing ICFG memsetNonZero2_true-valid-memsafety_true-termination.c [2018-01-21 03:24:57,331 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:24:57,337 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 03:24:57,378 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:24:57,379 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:24:57,379 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:24:57,379 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:24:57,379 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:24:57,379 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:24:57,379 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:24:57,380 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:24:57,381 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:24:57,396 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-01-21 03:24:57,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:24:57,401 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:24:57,402 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:24:57,402 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:24:57,406 INFO L82 PathProgramCache]: Analyzing trace with hash 50935, now seen corresponding path program 1 times [2018-01-21 03:24:57,409 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:24:57,457 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:57,457 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:24:57,457 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:57,458 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:24:57,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:24:57,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:24:57,517 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:24:57,522 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:24:57,529 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:24:57,529 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:24:57,530 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:24:57,530 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:24:57,530 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:24:57,530 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:24:57,530 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:24:57,530 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:24:57,530 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:24:57,531 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-01-21 03:24:57,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 03:24:57,532 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:24:57,532 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:24:57,532 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:24:57,532 INFO L82 PathProgramCache]: Analyzing trace with hash 457189328, now seen corresponding path program 1 times [2018-01-21 03:24:57,533 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:24:57,533 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:57,534 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:24:57,534 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:57,534 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:24:57,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:24:57,563 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:24:57,651 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:57,653 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:24:57,653 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 03:24:57,654 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:24:57,657 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 03:24:57,674 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 03:24:57,674 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 03:24:57,677 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 4 states. [2018-01-21 03:24:57,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:24:57,744 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-21 03:24:57,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:24:57,745 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2018-01-21 03:24:57,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:24:57,753 INFO L225 Difference]: With dead ends: 33 [2018-01-21 03:24:57,754 INFO L226 Difference]: Without dead ends: 19 [2018-01-21 03:24:57,817 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 03:24:57,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-01-21 03:24:57,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-01-21 03:24:57,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-01-21 03:24:57,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-01-21 03:24:57,847 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-01-21 03:24:57,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:24:57,848 INFO L432 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-01-21 03:24:57,848 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 03:24:57,848 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-01-21 03:24:57,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 03:24:57,849 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:24:57,849 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:24:57,849 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:24:57,849 INFO L82 PathProgramCache]: Analyzing trace with hash -114007861, now seen corresponding path program 1 times [2018-01-21 03:24:57,850 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:24:57,851 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:57,851 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:24:57,851 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:57,851 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:24:57,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:24:57,870 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:24:57,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:57,939 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:57,939 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:24:57,940 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-01-21 03:24:57,942 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [9], [10], [14], [15], [17], [18], [19], [20], [22], [23], [24], [25], [26], [27] [2018-01-21 03:24:57,988 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:24:57,988 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:24:58,596 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:24:58,598 INFO L268 AbstractInterpreter]: Visited 18 different actions 22 times. Merged at 3 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 15 variables. [2018-01-21 03:24:58,611 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:24:58,611 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:58,611 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:24:58,630 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:24:58,630 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:24:58,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:24:58,664 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:24:58,764 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:58,764 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:24:58,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:58,991 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:58,991 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:24:58,995 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:24:58,995 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:24:59,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:24:59,021 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:24:59,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,027 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:24:59,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,208 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:24:59,209 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-01-21 03:24:59,209 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:24:59,210 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:24:59,210 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:24:59,210 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:24:59,210 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2018-01-21 03:24:59,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:24:59,241 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-01-21 03:24:59,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 03:24:59,241 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2018-01-21 03:24:59,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:24:59,243 INFO L225 Difference]: With dead ends: 29 [2018-01-21 03:24:59,243 INFO L226 Difference]: Without dead ends: 20 [2018-01-21 03:24:59,244 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2018-01-21 03:24:59,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-21 03:24:59,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-21 03:24:59,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-21 03:24:59,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-21 03:24:59,249 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-21 03:24:59,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:24:59,249 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-21 03:24:59,249 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:24:59,249 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-21 03:24:59,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 03:24:59,250 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:24:59,250 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:24:59,250 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:24:59,251 INFO L82 PathProgramCache]: Analyzing trace with hash -641251536, now seen corresponding path program 2 times [2018-01-21 03:24:59,251 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:24:59,252 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:59,252 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:24:59,252 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:59,252 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:24:59,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:24:59,266 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:24:59,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,375 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:59,375 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:24:59,376 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:24:59,376 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:24:59,376 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:59,376 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:24:59,381 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:24:59,381 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:24:59,395 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:24:59,402 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:24:59,403 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:24:59,405 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:24:59,496 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,496 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:24:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,667 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:59,667 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:24:59,680 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:24:59,680 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:24:59,694 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:24:59,705 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:24:59,714 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:24:59,720 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:24:59,725 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,725 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:24:59,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,808 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:24:59,808 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 14 [2018-01-21 03:24:59,808 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:24:59,809 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 03:24:59,809 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 03:24:59,809 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2018-01-21 03:24:59,810 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 10 states. [2018-01-21 03:24:59,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:24:59,846 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-21 03:24:59,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 03:24:59,847 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 19 [2018-01-21 03:24:59,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:24:59,847 INFO L225 Difference]: With dead ends: 30 [2018-01-21 03:24:59,847 INFO L226 Difference]: Without dead ends: 21 [2018-01-21 03:24:59,848 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2018-01-21 03:24:59,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-21 03:24:59,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-21 03:24:59,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-21 03:24:59,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-21 03:24:59,851 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-21 03:24:59,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:24:59,851 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-21 03:24:59,852 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 03:24:59,852 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-21 03:24:59,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 03:24:59,852 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:24:59,852 INFO L322 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:24:59,852 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:24:59,852 INFO L82 PathProgramCache]: Analyzing trace with hash 194063723, now seen corresponding path program 3 times [2018-01-21 03:24:59,853 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:24:59,853 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:59,853 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:24:59,854 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:24:59,854 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:24:59,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:24:59,866 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:24:59,924 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,924 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:59,924 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:24:59,924 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:24:59,924 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:24:59,924 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:24:59,924 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:24:59,930 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:24:59,930 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:24:59,938 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:24:59,940 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:24:59,941 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:24:59,942 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:24:59,943 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:24:59,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:24:59,987 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:00,143 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,165 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:00,165 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:00,169 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:00,169 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:00,185 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:00,197 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:00,209 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:00,218 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:00,221 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:00,225 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,226 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:00,292 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,293 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:00,294 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-01-21 03:25:00,294 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:00,294 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 03:25:00,294 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 03:25:00,295 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:25:00,295 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2018-01-21 03:25:00,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:00,324 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-21 03:25:00,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 03:25:00,325 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2018-01-21 03:25:00,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:00,326 INFO L225 Difference]: With dead ends: 31 [2018-01-21 03:25:00,326 INFO L226 Difference]: Without dead ends: 22 [2018-01-21 03:25:00,327 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=191, Unknown=0, NotChecked=0, Total=306 [2018-01-21 03:25:00,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-21 03:25:00,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-21 03:25:00,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-21 03:25:00,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-21 03:25:00,331 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-21 03:25:00,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:00,331 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-21 03:25:00,332 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 03:25:00,332 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-21 03:25:00,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 03:25:00,333 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:00,333 INFO L322 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:00,333 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:00,333 INFO L82 PathProgramCache]: Analyzing trace with hash 319032976, now seen corresponding path program 4 times [2018-01-21 03:25:00,333 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:00,334 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:00,335 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:00,335 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:00,335 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:00,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:00,350 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:00,430 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:00,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:00,431 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:00,431 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:00,432 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:00,432 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:00,440 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:00,441 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:00,455 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:00,457 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:00,498 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,499 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:00,775 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,796 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:00,797 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:00,801 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:00,801 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:00,826 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:00,830 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:00,836 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,836 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:00,963 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:00,965 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:00,965 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 03:25:00,965 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:00,966 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 03:25:00,966 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 03:25:00,966 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=239, Unknown=0, NotChecked=0, Total=380 [2018-01-21 03:25:00,967 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2018-01-21 03:25:01,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:01,028 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-21 03:25:01,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 03:25:01,029 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2018-01-21 03:25:01,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:01,030 INFO L225 Difference]: With dead ends: 32 [2018-01-21 03:25:01,030 INFO L226 Difference]: Without dead ends: 23 [2018-01-21 03:25:01,030 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=156, Invalid=264, Unknown=0, NotChecked=0, Total=420 [2018-01-21 03:25:01,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-21 03:25:01,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-21 03:25:01,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-21 03:25:01,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-21 03:25:01,035 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-21 03:25:01,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:01,035 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-21 03:25:01,035 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 03:25:01,035 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-21 03:25:01,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 03:25:01,035 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:01,036 INFO L322 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:01,036 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:01,036 INFO L82 PathProgramCache]: Analyzing trace with hash -101887477, now seen corresponding path program 5 times [2018-01-21 03:25:01,036 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:01,037 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:01,037 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:01,037 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:01,037 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:01,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:01,050 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:01,119 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,119 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:01,119 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:01,119 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:01,119 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:01,119 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:01,120 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:01,125 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:01,125 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:01,130 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,131 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,132 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,138 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,140 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:01,142 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:01,225 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,226 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:01,431 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,455 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:01,455 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:01,458 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:01,458 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:01,463 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,465 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,468 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,479 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:01,486 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:01,490 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:01,495 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,495 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:01,601 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,602 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:01,602 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 03:25:01,603 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:01,603 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 03:25:01,603 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 03:25:01,604 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=320, Unknown=0, NotChecked=0, Total=506 [2018-01-21 03:25:01,604 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 16 states. [2018-01-21 03:25:01,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:01,653 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-21 03:25:01,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:25:01,654 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 22 [2018-01-21 03:25:01,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:01,655 INFO L225 Difference]: With dead ends: 33 [2018-01-21 03:25:01,655 INFO L226 Difference]: Without dead ends: 24 [2018-01-21 03:25:01,656 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2018-01-21 03:25:01,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-21 03:25:01,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-21 03:25:01,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-21 03:25:01,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-21 03:25:01,660 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-21 03:25:01,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:01,660 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-21 03:25:01,660 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 03:25:01,660 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-21 03:25:01,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 03:25:01,661 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:01,661 INFO L322 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:01,661 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:01,661 INFO L82 PathProgramCache]: Analyzing trace with hash -265519632, now seen corresponding path program 6 times [2018-01-21 03:25:01,662 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:01,662 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:01,663 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:01,663 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:01,663 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:01,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:01,675 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:01,787 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,788 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:01,788 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:01,788 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:01,788 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:01,788 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:01,788 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:01,793 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:01,794 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:01,802 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:01,804 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:01,806 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:01,808 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:01,808 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:01,810 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:01,896 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:01,896 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:02,122 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:02,145 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:02,145 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:02,149 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:02,149 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:02,160 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:02,167 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:02,175 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:02,184 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:02,191 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:02,194 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:02,199 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:02,199 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:02,312 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:02,314 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:02,315 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 26 [2018-01-21 03:25:02,315 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:02,315 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 03:25:02,316 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 03:25:02,316 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=413, Unknown=0, NotChecked=0, Total=650 [2018-01-21 03:25:02,316 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 18 states. [2018-01-21 03:25:02,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:02,383 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 03:25:02,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 03:25:02,385 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 23 [2018-01-21 03:25:02,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:02,386 INFO L225 Difference]: With dead ends: 34 [2018-01-21 03:25:02,386 INFO L226 Difference]: Without dead ends: 25 [2018-01-21 03:25:02,387 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=256, Invalid=446, Unknown=0, NotChecked=0, Total=702 [2018-01-21 03:25:02,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-21 03:25:02,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-21 03:25:02,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-21 03:25:02,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-21 03:25:02,392 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-21 03:25:02,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:02,392 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-21 03:25:02,392 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 03:25:02,392 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-21 03:25:02,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 03:25:02,393 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:02,393 INFO L322 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:02,393 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:02,394 INFO L82 PathProgramCache]: Analyzing trace with hash -1043149141, now seen corresponding path program 7 times [2018-01-21 03:25:02,394 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:02,395 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:02,395 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:02,395 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:02,395 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:02,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:02,412 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:02,618 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:02,618 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:02,618 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:02,618 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:02,618 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:02,618 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:02,618 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:02,628 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:02,628 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:02,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:02,640 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:02,757 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:02,757 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:02,991 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,013 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:03,013 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:03,017 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:03,017 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:03,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:03,040 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:03,045 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,045 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:03,119 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,120 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:03,120 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 03:25:03,120 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:03,123 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 03:25:03,123 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 03:25:03,123 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=518, Unknown=0, NotChecked=0, Total=812 [2018-01-21 03:25:03,124 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 20 states. [2018-01-21 03:25:03,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:03,192 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-21 03:25:03,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 03:25:03,192 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 24 [2018-01-21 03:25:03,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:03,193 INFO L225 Difference]: With dead ends: 35 [2018-01-21 03:25:03,193 INFO L226 Difference]: Without dead ends: 26 [2018-01-21 03:25:03,194 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=315, Invalid=555, Unknown=0, NotChecked=0, Total=870 [2018-01-21 03:25:03,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-21 03:25:03,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-21 03:25:03,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-21 03:25:03,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-21 03:25:03,199 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-21 03:25:03,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:03,200 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-21 03:25:03,200 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 03:25:03,200 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-21 03:25:03,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 03:25:03,201 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:03,201 INFO L322 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:03,201 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:03,201 INFO L82 PathProgramCache]: Analyzing trace with hash 620139856, now seen corresponding path program 8 times [2018-01-21 03:25:03,201 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:03,202 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:03,202 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:03,202 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:03,203 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:03,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:03,217 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:03,339 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,340 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:03,340 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:03,340 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:03,340 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:03,340 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:03,340 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:03,347 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:03,347 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:03,356 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:03,360 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:03,362 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:03,366 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:03,590 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,590 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:03,848 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,875 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:03,876 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:03,879 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:03,879 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:03,889 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:03,899 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:03,910 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:03,914 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:03,919 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:03,919 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:04,025 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:04,026 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:04,027 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 03:25:04,027 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:04,027 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 03:25:04,027 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 03:25:04,027 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=635, Unknown=0, NotChecked=0, Total=992 [2018-01-21 03:25:04,028 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 22 states. [2018-01-21 03:25:04,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:04,057 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-21 03:25:04,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 03:25:04,059 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 25 [2018-01-21 03:25:04,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:04,060 INFO L225 Difference]: With dead ends: 36 [2018-01-21 03:25:04,060 INFO L226 Difference]: Without dead ends: 27 [2018-01-21 03:25:04,061 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 03:25:04,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-21 03:25:04,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-21 03:25:04,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-21 03:25:04,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-21 03:25:04,065 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-21 03:25:04,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:04,066 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-21 03:25:04,066 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 03:25:04,066 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-21 03:25:04,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 03:25:04,067 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:04,067 INFO L322 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:04,067 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:04,067 INFO L82 PathProgramCache]: Analyzing trace with hash 642491211, now seen corresponding path program 9 times [2018-01-21 03:25:04,067 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:04,068 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:04,068 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:04,068 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:04,069 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:04,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:04,080 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:04,244 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:04,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:04,245 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:04,245 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:04,245 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:04,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:04,245 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:04,258 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:04,258 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:04,268 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,282 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,289 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,291 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,298 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,301 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,302 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:04,304 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:04,398 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:04,398 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:04,677 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:04,698 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:04,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:04,702 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:04,702 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:04,713 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,720 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,728 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,737 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,746 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,755 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:04,763 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:04,767 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:04,774 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:04,774 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:04,875 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:04,876 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:04,877 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 35 [2018-01-21 03:25:04,877 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:04,877 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 03:25:04,877 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 03:25:04,878 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=764, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 03:25:04,878 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 24 states. [2018-01-21 03:25:04,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:04,929 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-21 03:25:04,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 03:25:04,929 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2018-01-21 03:25:04,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:04,930 INFO L225 Difference]: With dead ends: 37 [2018-01-21 03:25:04,930 INFO L226 Difference]: Without dead ends: 28 [2018-01-21 03:25:04,931 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=451, Invalid=809, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 03:25:04,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-21 03:25:04,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-21 03:25:04,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-21 03:25:04,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-21 03:25:04,935 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-21 03:25:04,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:04,936 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-21 03:25:04,936 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 03:25:04,936 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-21 03:25:04,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 03:25:04,937 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:04,937 INFO L322 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:04,937 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:04,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1335383216, now seen corresponding path program 10 times [2018-01-21 03:25:04,937 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:04,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:04,938 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:04,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:04,938 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:04,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:04,949 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:05,052 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:05,052 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:05,052 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:05,053 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:05,053 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:05,053 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:05,053 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:05,059 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:05,060 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:05,089 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:05,090 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:05,196 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:05,196 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:05,496 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:05,518 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:05,519 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:05,522 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:05,522 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:05,549 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:05,553 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:05,559 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:05,560 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:05,749 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:05,753 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:05,753 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 03:25:05,754 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:05,754 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 03:25:05,754 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 03:25:05,755 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=905, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:25:05,755 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 26 states. [2018-01-21 03:25:05,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:05,893 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-21 03:25:05,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 03:25:05,894 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 27 [2018-01-21 03:25:05,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:05,895 INFO L225 Difference]: With dead ends: 38 [2018-01-21 03:25:05,896 INFO L226 Difference]: Without dead ends: 29 [2018-01-21 03:25:05,896 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=528, Invalid=954, Unknown=0, NotChecked=0, Total=1482 [2018-01-21 03:25:05,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-21 03:25:05,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-21 03:25:05,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-21 03:25:05,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-21 03:25:05,901 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-21 03:25:05,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:05,901 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-21 03:25:05,901 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 03:25:05,901 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-21 03:25:05,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 03:25:05,902 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:05,902 INFO L322 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:05,903 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:05,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1340198891, now seen corresponding path program 11 times [2018-01-21 03:25:05,903 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:05,904 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:05,904 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:05,904 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:05,904 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:05,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:05,917 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:06,180 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:06,181 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:06,181 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:06,181 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:06,181 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:06,181 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:06,181 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:06,189 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:06,189 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:06,194 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,200 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,201 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,202 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,203 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,208 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,209 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:06,211 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:06,313 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:06,313 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:06,601 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:06,628 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:06,628 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:06,631 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:06,632 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:06,635 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,640 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,644 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,648 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,653 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,663 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:06,673 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:06,677 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:06,684 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:06,684 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:06,792 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:06,793 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:06,794 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 03:25:06,794 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:06,794 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 03:25:06,794 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 03:25:06,795 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1058, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 03:25:06,795 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-01-21 03:25:06,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:06,875 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-21 03:25:06,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 03:25:06,875 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-01-21 03:25:06,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:06,876 INFO L225 Difference]: With dead ends: 39 [2018-01-21 03:25:06,876 INFO L226 Difference]: Without dead ends: 30 [2018-01-21 03:25:06,877 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=611, Invalid=1111, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 03:25:06,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-21 03:25:06,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-21 03:25:06,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-21 03:25:06,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-21 03:25:06,879 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-21 03:25:06,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:06,879 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-21 03:25:06,880 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 03:25:06,880 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-21 03:25:06,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 03:25:06,880 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:06,880 INFO L322 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:06,880 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:06,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1489484816, now seen corresponding path program 12 times [2018-01-21 03:25:06,881 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:06,881 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:06,881 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:06,881 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:06,881 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:06,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:06,891 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:07,103 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:07,103 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:07,104 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:07,104 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:07,104 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:07,104 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:07,104 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:07,109 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:07,110 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:07,117 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,119 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,120 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,122 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,123 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,124 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,126 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,130 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:07,132 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:07,278 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:07,278 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:07,625 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:07,660 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:07,660 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:07,663 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:07,664 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:07,675 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,682 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,691 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,699 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,708 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,718 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,728 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:07,736 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:07,739 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:07,744 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:07,961 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:07,963 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:07,964 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 44 [2018-01-21 03:25:07,964 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:07,964 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 03:25:07,964 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 03:25:07,965 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=1223, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 03:25:07,965 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 30 states. [2018-01-21 03:25:08,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:08,023 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-21 03:25:08,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 03:25:08,023 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 29 [2018-01-21 03:25:08,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:08,024 INFO L225 Difference]: With dead ends: 40 [2018-01-21 03:25:08,024 INFO L226 Difference]: Without dead ends: 31 [2018-01-21 03:25:08,025 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=700, Invalid=1280, Unknown=0, NotChecked=0, Total=1980 [2018-01-21 03:25:08,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-21 03:25:08,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-21 03:25:08,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-21 03:25:08,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-21 03:25:08,029 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-21 03:25:08,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:08,029 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-21 03:25:08,030 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 03:25:08,030 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-21 03:25:08,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 03:25:08,030 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:08,030 INFO L322 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:08,030 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:08,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1822381195, now seen corresponding path program 13 times [2018-01-21 03:25:08,031 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:08,031 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:08,031 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:08,031 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:08,031 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:08,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:08,041 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:08,560 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:08,560 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:08,560 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:08,560 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:08,560 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:08,561 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:08,561 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:08,572 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:08,572 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:08,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:08,587 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:08,792 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:08,792 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:09,255 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:09,287 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:09,287 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:09,293 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:09,293 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:09,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:09,316 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:09,321 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:09,321 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:09,435 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:09,436 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:09,437 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 03:25:09,437 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:09,437 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 03:25:09,437 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 03:25:09,438 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1400, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 03:25:09,438 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 32 states. [2018-01-21 03:25:09,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:09,492 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-21 03:25:09,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 03:25:09,493 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 30 [2018-01-21 03:25:09,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:09,493 INFO L225 Difference]: With dead ends: 41 [2018-01-21 03:25:09,493 INFO L226 Difference]: Without dead ends: 32 [2018-01-21 03:25:09,494 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2018-01-21 03:25:09,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-21 03:25:09,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-21 03:25:09,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-21 03:25:09,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-21 03:25:09,497 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-21 03:25:09,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:09,497 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-21 03:25:09,497 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 03:25:09,497 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-21 03:25:09,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 03:25:09,498 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:09,498 INFO L322 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:09,498 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:09,498 INFO L82 PathProgramCache]: Analyzing trace with hash -742732944, now seen corresponding path program 14 times [2018-01-21 03:25:09,498 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:09,498 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:09,499 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:09,499 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:09,499 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:09,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:09,507 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:09,650 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:09,650 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:09,650 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:09,650 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:09,650 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:09,651 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:09,651 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:09,659 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:09,660 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:09,667 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:09,671 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:09,674 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:09,676 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:09,921 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:09,921 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:10,347 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:10,368 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:10,368 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:10,373 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:10,373 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:10,383 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:10,398 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:10,410 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:10,413 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:10,418 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:10,419 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:10,523 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:10,525 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:10,525 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 03:25:10,525 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:10,525 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 03:25:10,526 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 03:25:10,526 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=1589, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 03:25:10,527 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 34 states. [2018-01-21 03:25:10,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:10,612 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-21 03:25:10,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 03:25:10,615 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 31 [2018-01-21 03:25:10,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:10,616 INFO L225 Difference]: With dead ends: 42 [2018-01-21 03:25:10,616 INFO L226 Difference]: Without dead ends: 33 [2018-01-21 03:25:10,617 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=896, Invalid=1654, Unknown=0, NotChecked=0, Total=2550 [2018-01-21 03:25:10,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-21 03:25:10,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-21 03:25:10,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-21 03:25:10,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-21 03:25:10,620 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-21 03:25:10,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:10,621 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-21 03:25:10,621 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 03:25:10,621 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-21 03:25:10,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 03:25:10,621 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:10,622 INFO L322 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:10,622 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:10,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1343107371, now seen corresponding path program 15 times [2018-01-21 03:25:10,622 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:10,623 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:10,623 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:10,623 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:10,623 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:10,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:10,632 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:10,803 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:10,803 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:10,803 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:10,803 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:10,803 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:10,803 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:10,803 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:10,812 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:10,812 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:10,819 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,830 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,831 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,836 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,838 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,839 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,840 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,841 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,842 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:10,843 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:10,844 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:10,987 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:11,516 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:11,548 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:11,549 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:11,552 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:11,552 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:11,564 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,571 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,579 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,588 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,597 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,606 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,617 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,627 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,638 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:11,647 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:11,650 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:11,657 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:11,657 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:11,836 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:11,838 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:11,838 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 53 [2018-01-21 03:25:11,838 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:11,839 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 03:25:11,839 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 03:25:11,840 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1790, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 03:25:11,840 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 36 states. [2018-01-21 03:25:11,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:11,894 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-21 03:25:11,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 03:25:11,894 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 32 [2018-01-21 03:25:11,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:11,895 INFO L225 Difference]: With dead ends: 43 [2018-01-21 03:25:11,895 INFO L226 Difference]: Without dead ends: 34 [2018-01-21 03:25:11,895 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1003, Invalid=1859, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 03:25:11,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-21 03:25:11,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-21 03:25:11,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-21 03:25:11,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-21 03:25:11,898 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-21 03:25:11,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:11,899 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-21 03:25:11,899 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 03:25:11,899 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-21 03:25:11,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 03:25:11,899 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:11,899 INFO L322 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:11,899 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:11,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1579647696, now seen corresponding path program 16 times [2018-01-21 03:25:11,899 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:11,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:11,900 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:11,900 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:11,900 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:11,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:11,909 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:12,126 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:12,127 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:12,127 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:12,127 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:12,127 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:12,127 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:12,127 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:12,132 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:12,132 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:12,143 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:12,145 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:12,281 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:12,281 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:12,890 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:12,922 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:12,923 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:12,926 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:12,926 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:12,958 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:12,961 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:12,967 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:13,144 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:13,145 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:13,146 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 56 [2018-01-21 03:25:13,146 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:13,146 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 03:25:13,146 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 03:25:13,147 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=2003, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 03:25:13,148 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 38 states. [2018-01-21 03:25:13,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:13,394 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-21 03:25:13,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 03:25:13,394 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 33 [2018-01-21 03:25:13,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:13,395 INFO L225 Difference]: With dead ends: 44 [2018-01-21 03:25:13,395 INFO L226 Difference]: Without dead ends: 35 [2018-01-21 03:25:13,396 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1116, Invalid=2076, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 03:25:13,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-21 03:25:13,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-21 03:25:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-21 03:25:13,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-21 03:25:13,400 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-21 03:25:13,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:13,401 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-21 03:25:13,401 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 03:25:13,401 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-21 03:25:13,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 03:25:13,401 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:13,402 INFO L322 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:13,402 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:13,402 INFO L82 PathProgramCache]: Analyzing trace with hash 322463179, now seen corresponding path program 17 times [2018-01-21 03:25:13,402 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:13,403 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:13,403 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:13,403 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:13,403 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:13,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:13,412 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:13,704 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:13,704 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:13,705 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:13,705 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:13,705 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:13,705 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:13,705 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:13,711 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:13,711 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:13,715 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,716 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,717 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,718 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,719 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,720 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,722 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,723 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,724 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,729 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:13,730 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:13,732 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:13,918 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:13,918 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:14,748 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:14,769 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:14,769 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 35 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 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:14,772 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:14,772 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:14,777 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,779 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,784 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,790 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,797 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,804 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,812 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,831 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,847 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:14,856 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:14,860 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:14,868 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:14,868 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:15,039 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:15,040 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:15,040 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 59 [2018-01-21 03:25:15,040 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:15,040 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 03:25:15,041 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 03:25:15,041 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2228, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 03:25:15,041 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 40 states. [2018-01-21 03:25:15,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:15,100 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-21 03:25:15,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 03:25:15,100 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 34 [2018-01-21 03:25:15,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:15,101 INFO L225 Difference]: With dead ends: 45 [2018-01-21 03:25:15,101 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 03:25:15,102 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1235, Invalid=2305, Unknown=0, NotChecked=0, Total=3540 [2018-01-21 03:25:15,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 03:25:15,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 03:25:15,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 03:25:15,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-21 03:25:15,105 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-21 03:25:15,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:15,105 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-21 03:25:15,105 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 03:25:15,105 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-21 03:25:15,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 03:25:15,105 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:15,105 INFO L322 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:15,105 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:15,105 INFO L82 PathProgramCache]: Analyzing trace with hash 4448816, now seen corresponding path program 18 times [2018-01-21 03:25:15,106 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:15,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:15,106 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:15,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:15,106 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:15,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:15,113 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:15,429 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:15,430 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:15,430 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:15,430 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:15,430 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:15,430 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:15,430 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:15,437 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:15,437 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:15,447 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,449 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,450 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,453 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,454 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,455 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,457 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,458 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,459 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:15,460 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:15,461 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:15,658 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:16,363 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:16,383 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:16,384 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 37 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 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:16,388 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:16,388 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:16,401 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,413 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,426 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,438 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,453 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,464 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,480 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,498 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,514 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,531 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:16,545 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:16,549 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:16,555 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:16,555 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:16,713 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:16,714 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:16,714 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 62 [2018-01-21 03:25:16,714 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:16,715 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-21 03:25:16,715 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-21 03:25:16,716 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2465, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 03:25:16,716 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 42 states. [2018-01-21 03:25:16,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:16,770 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-21 03:25:16,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 03:25:16,770 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 35 [2018-01-21 03:25:16,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:16,771 INFO L225 Difference]: With dead ends: 46 [2018-01-21 03:25:16,771 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 03:25:16,772 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1360, Invalid=2546, Unknown=0, NotChecked=0, Total=3906 [2018-01-21 03:25:16,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 03:25:16,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 03:25:16,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 03:25:16,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-21 03:25:16,776 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-21 03:25:16,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:16,776 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-21 03:25:16,776 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-21 03:25:16,776 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-21 03:25:16,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 03:25:16,776 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:16,776 INFO L322 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:16,776 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:16,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1264061845, now seen corresponding path program 19 times [2018-01-21 03:25:16,777 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:16,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:16,777 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:16,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:16,777 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:16,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:16,786 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:17,111 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:17,112 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:17,112 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:17,112 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:17,112 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:17,112 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:17,112 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:17,118 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:17,118 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:17,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:17,137 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:17,337 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:17,337 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:18,065 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:18,084 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:18,085 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 39 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 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:18,093 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:18,094 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:18,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:18,130 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:18,343 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:18,344 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:18,344 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 65 [2018-01-21 03:25:18,344 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:18,345 INFO L409 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-01-21 03:25:18,345 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-01-21 03:25:18,346 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1446, Invalid=2714, Unknown=0, NotChecked=0, Total=4160 [2018-01-21 03:25:18,346 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 44 states. [2018-01-21 03:25:18,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:18,454 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-21 03:25:18,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 03:25:18,454 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 36 [2018-01-21 03:25:18,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:18,454 INFO L225 Difference]: With dead ends: 47 [2018-01-21 03:25:18,454 INFO L226 Difference]: Without dead ends: 38 [2018-01-21 03:25:18,455 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1491, Invalid=2799, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 03:25:18,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-21 03:25:18,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-21 03:25:18,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 03:25:18,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-21 03:25:18,458 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-21 03:25:18,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:18,458 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-21 03:25:18,459 INFO L433 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-01-21 03:25:18,459 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-21 03:25:18,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 03:25:18,459 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:18,459 INFO L322 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:18,460 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:18,460 INFO L82 PathProgramCache]: Analyzing trace with hash -1933186672, now seen corresponding path program 20 times [2018-01-21 03:25:18,460 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:18,461 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:18,461 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:18,461 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:18,461 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:18,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:18,469 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:18,904 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:18,904 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:18,905 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:18,905 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:18,905 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:18,905 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:18,905 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:18,911 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:18,912 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:18,922 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:18,929 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:18,931 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:18,934 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:19,151 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:19,152 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:19,943 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:19,969 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:19,969 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 41 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 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:19,977 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:19,978 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:19,993 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:20,012 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:20,030 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:20,035 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:20,043 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:20,043 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:20,220 WARN L143 SmtUtils]: Spent 175ms on a formula simplification that was a NOOP. DAG size: 68 [2018-01-21 03:25:20,373 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:20,375 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:20,375 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 68 [2018-01-21 03:25:20,375 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:20,375 INFO L409 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-01-21 03:25:20,376 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-01-21 03:25:20,376 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1583, Invalid=2973, Unknown=0, NotChecked=0, Total=4556 [2018-01-21 03:25:20,376 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 46 states. [2018-01-21 03:25:20,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:20,442 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-21 03:25:20,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 03:25:20,442 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 37 [2018-01-21 03:25:20,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:20,443 INFO L225 Difference]: With dead ends: 48 [2018-01-21 03:25:20,443 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 03:25:20,443 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1630, Invalid=3062, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 03:25:20,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 03:25:20,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 03:25:20,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 03:25:20,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-21 03:25:20,446 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-21 03:25:20,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:20,446 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-21 03:25:20,447 INFO L433 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-01-21 03:25:20,447 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-21 03:25:20,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-21 03:25:20,447 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:20,447 INFO L322 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:20,447 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:20,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1201219829, now seen corresponding path program 21 times [2018-01-21 03:25:20,448 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:20,448 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:20,448 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:20,448 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:20,449 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:20,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:20,458 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:20,823 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:20,823 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:20,823 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:20,823 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:20,823 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:20,823 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:20,823 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:20,829 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:20,829 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:20,837 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,840 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,841 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,842 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,844 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,845 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,847 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,848 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,850 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,852 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,854 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,855 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:20,855 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:20,857 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:21,173 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:21,173 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:22,046 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:22,066 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:22,067 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 43 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 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:22,071 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:22,071 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:22,082 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,089 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,098 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,106 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,115 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,125 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,140 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,156 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,167 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,178 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,190 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,202 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:22,211 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:22,216 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:22,224 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:22,224 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:22,418 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:22,419 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:22,419 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 71 [2018-01-21 03:25:22,419 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:22,419 INFO L409 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-01-21 03:25:22,420 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-01-21 03:25:22,420 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1726, Invalid=3244, Unknown=0, NotChecked=0, Total=4970 [2018-01-21 03:25:22,421 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 48 states. [2018-01-21 03:25:22,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:22,481 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-21 03:25:22,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 03:25:22,482 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 38 [2018-01-21 03:25:22,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:22,482 INFO L225 Difference]: With dead ends: 49 [2018-01-21 03:25:22,482 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 03:25:22,483 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2136 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1775, Invalid=3337, Unknown=0, NotChecked=0, Total=5112 [2018-01-21 03:25:22,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 03:25:22,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 03:25:22,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 03:25:22,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-21 03:25:22,487 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-21 03:25:22,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:22,487 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-21 03:25:22,487 INFO L433 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-01-21 03:25:22,488 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-21 03:25:22,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 03:25:22,488 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:22,488 INFO L322 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:22,488 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:22,489 INFO L82 PathProgramCache]: Analyzing trace with hash 14915824, now seen corresponding path program 22 times [2018-01-21 03:25:22,489 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:22,489 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:22,490 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:22,490 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:22,490 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:22,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:22,497 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:22,963 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:22,964 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:22,964 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:22,964 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:22,964 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:22,964 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:22,964 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:22,969 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:22,969 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:22,982 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:22,984 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:23,280 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:23,281 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:24,081 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:24,102 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:24,102 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 45 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 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:24,105 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:24,105 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:24,156 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:24,159 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:24,165 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:24,166 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:24,551 WARN L143 SmtUtils]: Spent 111ms on a formula simplification that was a NOOP. DAG size: 74 [2018-01-21 03:25:24,564 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:24,565 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:24,566 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 74 [2018-01-21 03:25:24,566 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:24,566 INFO L409 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-01-21 03:25:24,566 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-01-21 03:25:24,566 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1875, Invalid=3527, Unknown=0, NotChecked=0, Total=5402 [2018-01-21 03:25:24,567 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 50 states. [2018-01-21 03:25:24,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:24,674 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-21 03:25:24,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 03:25:24,675 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 39 [2018-01-21 03:25:24,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:24,675 INFO L225 Difference]: With dead ends: 50 [2018-01-21 03:25:24,675 INFO L226 Difference]: Without dead ends: 41 [2018-01-21 03:25:24,676 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2368 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1926, Invalid=3624, Unknown=0, NotChecked=0, Total=5550 [2018-01-21 03:25:24,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-21 03:25:24,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-21 03:25:24,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 03:25:24,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-21 03:25:24,681 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-21 03:25:24,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:24,681 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-21 03:25:24,681 INFO L433 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-01-21 03:25:24,681 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-21 03:25:24,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 03:25:24,682 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:24,682 INFO L322 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:24,682 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:24,682 INFO L82 PathProgramCache]: Analyzing trace with hash -939584597, now seen corresponding path program 23 times [2018-01-21 03:25:24,682 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:24,683 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:24,683 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:24,683 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:24,683 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:24,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:24,693 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:25,251 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:25,251 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:25,251 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:25,251 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:25,251 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:25,251 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:25,251 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:25,256 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:25,256 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:25,261 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,262 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,263 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,263 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,264 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,265 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,266 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,267 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,268 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,269 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,270 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,271 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,275 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:25,276 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:25,278 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:25,641 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:25,642 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:26,851 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:26,876 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:26,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 47 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 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:26,880 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:26,881 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:26,886 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,888 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,892 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,896 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,901 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,906 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,911 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,917 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,923 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,930 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,937 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,946 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,964 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:26,974 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:26,978 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:26,987 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:27,264 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:27,266 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:27,266 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 77 [2018-01-21 03:25:27,266 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:27,267 INFO L409 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-01-21 03:25:27,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-01-21 03:25:27,268 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2030, Invalid=3822, Unknown=0, NotChecked=0, Total=5852 [2018-01-21 03:25:27,268 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 52 states. [2018-01-21 03:25:27,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:27,468 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-21 03:25:27,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 03:25:27,468 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 40 [2018-01-21 03:25:27,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:27,468 INFO L225 Difference]: With dead ends: 51 [2018-01-21 03:25:27,468 INFO L226 Difference]: Without dead ends: 42 [2018-01-21 03:25:27,469 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2612 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2083, Invalid=3923, Unknown=0, NotChecked=0, Total=6006 [2018-01-21 03:25:27,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-21 03:25:27,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-21 03:25:27,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-21 03:25:27,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-21 03:25:27,472 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-21 03:25:27,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:27,472 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-21 03:25:27,472 INFO L433 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-01-21 03:25:27,472 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-21 03:25:27,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 03:25:27,473 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:27,473 INFO L322 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:27,473 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:27,473 INFO L82 PathProgramCache]: Analyzing trace with hash -464326576, now seen corresponding path program 24 times [2018-01-21 03:25:27,473 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:27,474 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:27,474 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:27,474 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:27,474 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:27,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:27,484 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:27,882 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:27,882 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:27,882 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:27,882 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:27,882 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:27,883 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:27,883 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:27,889 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:27,889 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:27,896 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,898 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,900 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,901 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,903 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,904 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,905 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,907 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,908 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,910 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,911 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,913 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,915 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:27,915 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:27,917 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:28,234 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:28,234 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:29,184 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:29,221 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:29,221 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 49 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 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:29,226 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:29,226 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:29,242 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,253 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,267 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,280 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,295 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,310 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,327 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,344 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,358 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,375 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,391 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,427 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,446 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:29,461 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:29,465 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:29,471 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:29,471 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:29,712 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:29,713 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:29,713 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 80 [2018-01-21 03:25:29,713 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:29,713 INFO L409 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-01-21 03:25:29,714 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-01-21 03:25:29,714 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2191, Invalid=4129, Unknown=0, NotChecked=0, Total=6320 [2018-01-21 03:25:29,715 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 54 states. [2018-01-21 03:25:29,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:29,824 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-21 03:25:29,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 03:25:29,824 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 41 [2018-01-21 03:25:29,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:29,825 INFO L225 Difference]: With dead ends: 52 [2018-01-21 03:25:29,825 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 03:25:29,826 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2868 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2246, Invalid=4234, Unknown=0, NotChecked=0, Total=6480 [2018-01-21 03:25:29,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 03:25:29,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 03:25:29,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 03:25:29,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-21 03:25:29,830 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-21 03:25:29,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:29,830 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-21 03:25:29,830 INFO L433 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-01-21 03:25:29,830 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-21 03:25:29,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 03:25:29,831 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:29,831 INFO L322 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:29,831 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:29,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1383770187, now seen corresponding path program 25 times [2018-01-21 03:25:29,831 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:29,832 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:29,832 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:29,832 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:29,832 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:29,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:29,843 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:30,200 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:30,201 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:30,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:30,201 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:30,201 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:30,201 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:30,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:30,206 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:30,206 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:30,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:30,228 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:30,549 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:30,549 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:31,634 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:31,653 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:31,653 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 51 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 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:31,657 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:31,657 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:31,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:31,690 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:31,699 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:31,699 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:31,822 WARN L143 SmtUtils]: Spent 121ms on a formula simplification that was a NOOP. DAG size: 83 [2018-01-21 03:25:31,976 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:31,976 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:31,977 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 83 [2018-01-21 03:25:31,977 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:31,977 INFO L409 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-01-21 03:25:31,977 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-01-21 03:25:31,977 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2358, Invalid=4448, Unknown=0, NotChecked=0, Total=6806 [2018-01-21 03:25:31,978 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 56 states. [2018-01-21 03:25:32,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:32,055 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-21 03:25:32,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 03:25:32,056 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 42 [2018-01-21 03:25:32,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:32,056 INFO L225 Difference]: With dead ends: 53 [2018-01-21 03:25:32,056 INFO L226 Difference]: Without dead ends: 44 [2018-01-21 03:25:32,057 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3136 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2415, Invalid=4557, Unknown=0, NotChecked=0, Total=6972 [2018-01-21 03:25:32,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-21 03:25:32,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-21 03:25:32,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 03:25:32,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-21 03:25:32,060 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-21 03:25:32,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:32,060 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-21 03:25:32,060 INFO L433 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-01-21 03:25:32,060 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-21 03:25:32,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-21 03:25:32,060 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:32,060 INFO L322 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:32,060 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:32,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1454772304, now seen corresponding path program 26 times [2018-01-21 03:25:32,061 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:32,061 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:32,061 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:32,061 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:32,061 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:32,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:32,073 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:32,928 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:32,928 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:32,928 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:32,928 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:32,928 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:32,928 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:32,929 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:32,937 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:32,937 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:32,945 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:32,952 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:32,955 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:32,957 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:33,371 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:33,371 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:33,615 WARN L143 SmtUtils]: Spent 131ms on a formula simplification that was a NOOP. DAG size: 86 [2018-01-21 03:25:34,596 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:34,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:34,616 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 53 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 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:34,620 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:34,620 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:34,632 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:34,650 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:34,664 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:34,668 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:34,676 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:34,676 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:34,920 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:34,922 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:34,922 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 86 [2018-01-21 03:25:34,922 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:34,922 INFO L409 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-01-21 03:25:34,923 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-01-21 03:25:34,923 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2531, Invalid=4779, Unknown=0, NotChecked=0, Total=7310 [2018-01-21 03:25:34,923 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 58 states. [2018-01-21 03:25:35,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:35,012 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-21 03:25:35,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 03:25:35,013 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 43 [2018-01-21 03:25:35,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:35,014 INFO L225 Difference]: With dead ends: 54 [2018-01-21 03:25:35,014 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 03:25:35,014 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3416 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2590, Invalid=4892, Unknown=0, NotChecked=0, Total=7482 [2018-01-21 03:25:35,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 03:25:35,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-21 03:25:35,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-21 03:25:35,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-21 03:25:35,016 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-21 03:25:35,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:35,017 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-21 03:25:35,017 INFO L433 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-01-21 03:25:35,017 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-21 03:25:35,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 03:25:35,017 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:35,017 INFO L322 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:35,017 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:35,017 INFO L82 PathProgramCache]: Analyzing trace with hash 744723691, now seen corresponding path program 27 times [2018-01-21 03:25:35,017 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:35,018 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:35,018 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:35,018 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:35,018 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:35,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:35,027 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:35,488 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:35,488 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:35,488 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:35,488 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:35,488 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:35,488 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:35,488 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:35,497 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:35,497 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:35,505 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,507 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,508 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,509 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,510 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,512 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,513 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,514 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,516 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,517 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,518 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,520 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,521 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,523 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,524 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:35,524 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:35,526 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:36,039 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:36,039 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:37,148 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:37,176 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:37,176 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 55 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 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:37,179 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:37,179 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:37,192 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,199 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,207 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,225 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,235 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,244 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,255 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,266 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,277 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,295 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,308 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,323 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,337 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,351 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:37,364 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:37,368 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:37,375 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:37,375 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:37,621 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:37,622 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:37,623 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 89 [2018-01-21 03:25:37,623 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:37,623 INFO L409 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-01-21 03:25:37,623 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-01-21 03:25:37,624 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2710, Invalid=5122, Unknown=0, NotChecked=0, Total=7832 [2018-01-21 03:25:37,624 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 60 states. [2018-01-21 03:25:37,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:37,686 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-21 03:25:37,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 03:25:37,686 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 44 [2018-01-21 03:25:37,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:37,686 INFO L225 Difference]: With dead ends: 55 [2018-01-21 03:25:37,686 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 03:25:37,687 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3708 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2771, Invalid=5239, Unknown=0, NotChecked=0, Total=8010 [2018-01-21 03:25:37,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 03:25:37,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-21 03:25:37,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 03:25:37,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-21 03:25:37,690 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-21 03:25:37,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:37,691 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-21 03:25:37,691 INFO L433 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-01-21 03:25:37,691 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-21 03:25:37,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 03:25:37,691 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:37,692 INFO L322 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:37,692 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:37,692 INFO L82 PathProgramCache]: Analyzing trace with hash 209622800, now seen corresponding path program 28 times [2018-01-21 03:25:37,692 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:37,692 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:37,693 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:37,693 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:37,693 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:37,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:37,701 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:38,083 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:38,083 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:38,083 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:38,083 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:38,083 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:38,084 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:38,084 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:38,092 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:38,092 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:38,108 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:38,110 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:38,449 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:38,449 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:39,550 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:39,584 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:39,584 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 57 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 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:39,588 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:25:39,588 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:25:39,630 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:39,634 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:39,643 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:39,644 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:39,929 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:39,930 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:39,930 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 92 [2018-01-21 03:25:39,930 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:39,930 INFO L409 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-01-21 03:25:39,931 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-01-21 03:25:39,931 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2895, Invalid=5477, Unknown=0, NotChecked=0, Total=8372 [2018-01-21 03:25:39,931 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 62 states. [2018-01-21 03:25:40,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:40,016 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-21 03:25:40,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 03:25:40,017 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 45 [2018-01-21 03:25:40,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:40,017 INFO L225 Difference]: With dead ends: 56 [2018-01-21 03:25:40,017 INFO L226 Difference]: Without dead ends: 47 [2018-01-21 03:25:40,018 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4012 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2958, Invalid=5598, Unknown=0, NotChecked=0, Total=8556 [2018-01-21 03:25:40,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-21 03:25:40,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-21 03:25:40,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 03:25:40,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-21 03:25:40,022 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-21 03:25:40,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:40,022 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-21 03:25:40,022 INFO L433 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-01-21 03:25:40,022 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-21 03:25:40,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 03:25:40,023 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:40,023 INFO L322 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:40,023 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:40,023 INFO L82 PathProgramCache]: Analyzing trace with hash 801364363, now seen corresponding path program 29 times [2018-01-21 03:25:40,023 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:40,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:40,024 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:40,024 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:40,024 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:40,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:40,036 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:40,549 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:40,549 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:40,549 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:40,550 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:40,550 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:40,550 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:40,550 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:40,554 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:40,555 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:40,559 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,560 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,561 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,563 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,564 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,565 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,566 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,567 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,568 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,569 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,570 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,571 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,573 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,577 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:40,579 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:40,581 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:40,952 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:40,952 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:42,051 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:42,080 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:42,080 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 59 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 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:42,083 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:25:42,083 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:42,088 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,090 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,093 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,098 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,102 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,107 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,120 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,126 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,133 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,139 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,146 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,154 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,165 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,174 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,189 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:42,201 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:42,206 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:42,212 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:42,213 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:42,507 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:42,509 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:42,509 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 95 [2018-01-21 03:25:42,509 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:42,509 INFO L409 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-01-21 03:25:42,509 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-01-21 03:25:42,510 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3086, Invalid=5844, Unknown=0, NotChecked=0, Total=8930 [2018-01-21 03:25:42,510 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 64 states. [2018-01-21 03:25:42,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:42,591 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-21 03:25:42,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 03:25:42,591 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 46 [2018-01-21 03:25:42,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:42,591 INFO L225 Difference]: With dead ends: 57 [2018-01-21 03:25:42,591 INFO L226 Difference]: Without dead ends: 48 [2018-01-21 03:25:42,592 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4328 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3151, Invalid=5969, Unknown=0, NotChecked=0, Total=9120 [2018-01-21 03:25:42,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-21 03:25:42,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-21 03:25:42,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 03:25:42,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-21 03:25:42,595 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-21 03:25:42,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:42,595 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-21 03:25:42,595 INFO L433 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-01-21 03:25:42,595 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-21 03:25:42,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 03:25:42,595 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:42,596 INFO L322 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:42,596 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:42,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1965483632, now seen corresponding path program 30 times [2018-01-21 03:25:42,596 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:42,596 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:42,597 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:42,597 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:42,597 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:42,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:42,609 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:43,043 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:43,043 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:43,043 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:43,044 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:43,044 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:43,044 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:43,044 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:43,078 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:43,079 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:43,087 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,089 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,090 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,091 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,093 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,094 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,095 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,096 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,098 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,099 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,101 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,102 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,103 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,105 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,106 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,108 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:43,108 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:43,110 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:43,523 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:43,523 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:44,823 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:44,855 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:44,855 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 61 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 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:44,858 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:25:44,858 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:25:44,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,876 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,884 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,893 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,902 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,911 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,922 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,938 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,954 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,972 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:44,989 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:45,008 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:45,028 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:45,041 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:45,055 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:45,075 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:25:45,091 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:45,097 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:45,107 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:45,107 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:45,436 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:45,437 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:45,437 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 98 [2018-01-21 03:25:45,437 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:45,438 INFO L409 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-01-21 03:25:45,438 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-01-21 03:25:45,438 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3283, Invalid=6223, Unknown=0, NotChecked=0, Total=9506 [2018-01-21 03:25:45,438 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 66 states. [2018-01-21 03:25:45,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:45,505 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-21 03:25:45,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-21 03:25:45,505 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 47 [2018-01-21 03:25:45,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:45,506 INFO L225 Difference]: With dead ends: 58 [2018-01-21 03:25:45,506 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 03:25:45,506 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3350, Invalid=6352, Unknown=0, NotChecked=0, Total=9702 [2018-01-21 03:25:45,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 03:25:45,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-21 03:25:45,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-21 03:25:45,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-21 03:25:45,509 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-21 03:25:45,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:45,509 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-21 03:25:45,509 INFO L433 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-01-21 03:25:45,509 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-21 03:25:45,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 03:25:45,509 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:45,510 INFO L322 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:45,510 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:45,510 INFO L82 PathProgramCache]: Analyzing trace with hash -601524693, now seen corresponding path program 31 times [2018-01-21 03:25:45,510 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:45,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:45,511 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:45,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:45,511 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:45,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:45,519 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:45,999 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:45,999 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:45,999 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:45,999 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:46,000 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:46,000 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:46,000 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:46,005 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:46,005 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:46,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:46,024 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:46,929 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:46,930 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:48,166 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:48,186 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:48,186 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 63 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 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:48,189 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:48,190 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:25:48,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:48,228 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:48,235 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:48,235 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:48,522 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:48,523 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:48,524 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 101 [2018-01-21 03:25:48,524 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:48,524 INFO L409 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-01-21 03:25:48,524 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-01-21 03:25:48,524 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=6614, Unknown=0, NotChecked=0, Total=10100 [2018-01-21 03:25:48,525 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 68 states. [2018-01-21 03:25:48,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:48,600 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-21 03:25:48,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 03:25:48,600 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 48 [2018-01-21 03:25:48,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:48,601 INFO L225 Difference]: With dead ends: 59 [2018-01-21 03:25:48,601 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 03:25:48,601 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4996 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3555, Invalid=6747, Unknown=0, NotChecked=0, Total=10302 [2018-01-21 03:25:48,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 03:25:48,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-21 03:25:48,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 03:25:48,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-21 03:25:48,603 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-21 03:25:48,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:48,603 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-21 03:25:48,604 INFO L433 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-01-21 03:25:48,604 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-21 03:25:48,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 03:25:48,604 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:48,604 INFO L322 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:48,604 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:48,604 INFO L82 PathProgramCache]: Analyzing trace with hash 1425595856, now seen corresponding path program 32 times [2018-01-21 03:25:48,604 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:48,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:48,605 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:25:48,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:48,605 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:48,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:48,618 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:49,307 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:49,308 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:49,308 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:49,308 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:49,308 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:49,308 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:49,308 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:49,315 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:49,315 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:49,323 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:49,331 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:49,333 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:49,335 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:49,761 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:49,761 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:50,999 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:51,021 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:51,021 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 65 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 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:51,025 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:25:51,026 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:25:51,036 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:51,050 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:25:51,063 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:51,068 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:51,078 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:51,078 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:51,361 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:51,362 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:25:51,362 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 104 [2018-01-21 03:25:51,362 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:25:51,363 INFO L409 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-01-21 03:25:51,363 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-01-21 03:25:51,364 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3695, Invalid=7017, Unknown=0, NotChecked=0, Total=10712 [2018-01-21 03:25:51,364 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 70 states. [2018-01-21 03:25:51,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:25:51,503 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-21 03:25:51,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-21 03:25:51,503 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 49 [2018-01-21 03:25:51,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:25:51,504 INFO L225 Difference]: With dead ends: 60 [2018-01-21 03:25:51,504 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 03:25:51,505 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5348 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3766, Invalid=7154, Unknown=0, NotChecked=0, Total=10920 [2018-01-21 03:25:51,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 03:25:51,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-21 03:25:51,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-21 03:25:51,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-21 03:25:51,508 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-21 03:25:51,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:25:51,508 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-21 03:25:51,508 INFO L433 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-01-21 03:25:51,509 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-21 03:25:51,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 03:25:51,509 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:25:51,509 INFO L322 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:25:51,509 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:25:51,510 INFO L82 PathProgramCache]: Analyzing trace with hash -158176565, now seen corresponding path program 33 times [2018-01-21 03:25:51,510 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:25:51,510 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:51,510 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:25:51,511 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:25:51,511 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:25:51,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:25:51,524 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:25:52,168 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:52,168 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:52,168 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:25:52,168 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:25:52,168 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:25:52,168 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:52,168 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:25:52,174 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:52,174 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:52,181 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,183 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,184 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,186 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,187 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,188 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,189 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,191 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,192 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,193 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,195 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,196 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,197 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,199 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,201 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,203 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,205 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,207 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:52,209 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:52,212 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:52,765 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:52,765 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:25:54,088 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:54,108 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:25:54,108 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 67 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 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:25:54,112 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:25:54,112 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:25:54,123 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,130 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,138 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,148 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,157 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,171 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,186 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,201 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,228 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,240 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,258 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,277 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,290 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,304 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,327 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,351 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,376 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:25:54,395 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:25:54,711 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:25:54,718 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:25:54,718 INFO L314 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-01-21 03:25:54,775 INFO L175 TraceCheckSpWp]: Timeout while computing interpolants [2018-01-21 03:25:54,776 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 03:25:54,778 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:25:54,778 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:25:54,778 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:25:54,778 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:25:54,778 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:25:54,778 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:25:54,778 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:25:54,778 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 03:25:54,778 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:25:54,779 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-01-21 03:25:54,779 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 03:25:54,780 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.01 03:25:54 BoogieIcfgContainer [2018-01-21 03:25:54,780 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-21 03:25:54,781 INFO L168 Benchmark]: Toolchain (without parser) took 57868.51 ms. Allocated memory was 308.3 MB in the beginning and 796.4 MB in the end (delta: 488.1 MB). Free memory was 267.6 MB in the beginning and 461.0 MB in the end (delta: -193.4 MB). Peak memory consumption was 294.7 MB. Max. memory is 5.3 GB. [2018-01-21 03:25:54,781 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 308.3 MB. Free memory is still 271.6 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-21 03:25:54,782 INFO L168 Benchmark]: CACSL2BoogieTranslator took 200.85 ms. Allocated memory is still 308.3 MB. Free memory was 267.6 MB in the beginning and 259.6 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. [2018-01-21 03:25:54,782 INFO L168 Benchmark]: Boogie Preprocessor took 26.97 ms. Allocated memory is still 308.3 MB. Free memory was 259.6 MB in the beginning and 257.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-21 03:25:54,782 INFO L168 Benchmark]: RCFGBuilder took 168.10 ms. Allocated memory is still 308.3 MB. Free memory was 257.6 MB in the beginning and 245.1 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 5.3 GB. [2018-01-21 03:25:54,783 INFO L168 Benchmark]: TraceAbstraction took 57461.79 ms. Allocated memory was 308.3 MB in the beginning and 796.4 MB in the end (delta: 488.1 MB). Free memory was 245.1 MB in the beginning and 461.0 MB in the end (delta: -215.9 MB). Peak memory consumption was 272.2 MB. Max. memory is 5.3 GB. [2018-01-21 03:25:54,784 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 308.3 MB. Free memory is still 271.6 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 200.85 ms. Allocated memory is still 308.3 MB. Free memory was 267.6 MB in the beginning and 259.6 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 26.97 ms. Allocated memory is still 308.3 MB. Free memory was 259.6 MB in the beginning and 257.6 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 168.10 ms. Allocated memory is still 308.3 MB. Free memory was 257.6 MB in the beginning and 245.1 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 57461.79 ms. Allocated memory was 308.3 MB in the beginning and 796.4 MB in the end (delta: 488.1 MB). Free memory was 245.1 MB in the beginning and 461.0 MB in the end (delta: -215.9 MB). Peak memory consumption was 272.2 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 17 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 102 LocStat_NO_SUPPORTING_DISEQUALITIES : 23 LocStat_NO_DISJUNCTIONS : -34 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 24 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 33 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 24 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.224587 RENAME_VARIABLES(MILLISECONDS) : 0.114809 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.175965 PROJECTAWAY(MILLISECONDS) : 0.090952 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.222695 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.210219 ADD_EQUALITY(MILLISECONDS) : 0.045331 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.012113 #CONJOIN_DISJUNCTIVE : 32 #RENAME_VARIABLES : 62 #UNFREEZE : 0 #CONJOIN : 62 #PROJECTAWAY : 64 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 62 #ADD_EQUALITY : 33 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 21 locations, 3 error locations. UNSAFE Result, 0.1s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 51 with TraceHistMax 33, while TraceCheckSpWp was constructing backward predicates, while PartialQuantifierElimination was doing sequential composition of 36 TransFormulas, while SimplifyDDAWithTimeout was simplifying term of DAG size 107. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 21 locations, 3 error locations. TIMEOUT Result, 57.2s OverallTime, 34 OverallIterations, 33 TraceHistogramMax, 2.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 531 SDtfs, 105 SDslu, 10323 SDs, 0 SdLazy, 2277 SolverSat, 120 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4917 GetRequests, 3042 SyntacticMatches, 64 SemanticMatches, 1811 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58192 ImplicationChecksByTransitivity, 32.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=33, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 33 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.8s SatisfiabilityAnalysisTime, 45.6s InterpolantComputationTime, 3233 NumberOfCodeBlocks, 3233 NumberOfCodeBlocksAsserted, 379 NumberOfCheckSat, 5216 ConstructedInterpolants, 0 QuantifiedInterpolants, 761600 SizeOfPredicates, 64 NumberOfNonLiveVariables, 7072 ConjunctsInSsa, 1248 ConjunctsInUnsatCore, 161 InterpolantComputations, 1 PerfectInterpolantSequences, 0/29920 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 20]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 20). Cancelled while IsEmpty was searching accepting run (input had 21 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 21 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-21_03-25-54-801.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-21_03-25-54-801.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-21_03-25-54-801.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-21_03-25-54-801.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-21_03-25-54-801.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memsetNonZero2_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-21_03-25-54-801.csv Completed graceful shutdown