java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:48:54,629 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:48:54,631 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:48:54,645 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:48:54,646 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:48:54,647 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:48:54,648 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:48:54,649 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:48:54,651 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:48:54,651 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:48:54,652 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:48:54,653 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:48:54,654 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:48:54,655 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:48:54,656 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:48:54,659 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:48:54,661 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:48:54,663 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:48:54,664 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:48:54,665 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:48:54,667 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 08:48:54,668 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 08:48:54,668 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 08:48:54,669 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 08:48:54,670 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 08:48:54,671 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 08:48:54,671 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 08:48:54,672 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 08:48:54,672 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 08:48:54,672 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:48:54,672 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:48:54,673 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf [2018-01-21 08:48:54,682 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:48:54,683 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:48:54,684 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:48:54,684 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:48:54,684 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:48:54,684 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:48:54,684 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:48:54,685 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:48:54,685 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:48:54,685 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:48:54,686 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:48:54,686 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:48:54,686 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:48:54,686 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:48:54,686 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:48:54,687 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:48:54,687 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:48:54,687 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:48:54,687 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:48:54,687 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:48:54,688 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:48:54,688 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:48:54,688 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:48:54,688 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:48:54,688 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:48:54,689 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:48:54,689 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:48:54,689 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:48:54,689 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:48:54,690 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:48:54,690 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:48:54,690 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:48:54,690 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:48:54,690 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:48:54,690 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:48:54,691 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:48:54,691 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:48:54,691 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:48:54,692 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:48:54,692 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:48:54,726 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:48:54,738 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:48:54,742 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:48:54,743 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:48:54,744 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:48:54,744 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-21 08:48:54,856 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:48:54,861 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:48:54,861 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:48:54,862 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:48:54,866 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:48:54,867 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:48:54" (1/1) ... [2018-01-21 08:48:54,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@290110cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:54, skipping insertion in model container [2018-01-21 08:48:54,869 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:48:54" (1/1) ... [2018-01-21 08:48:54,886 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:48:54,903 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:48:55,008 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:48:55,026 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:48:55,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55 WrapperNode [2018-01-21 08:48:55,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:48:55,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:48:55,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:48:55,032 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:48:55,042 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,043 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,050 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,053 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,056 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,057 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... [2018-01-21 08:48:55,058 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:48:55,059 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:48:55,059 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:48:55,059 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:48:55,059 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:48:55,101 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:48:55,101 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:48:55,101 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:48:55,102 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:48:55,102 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:48:55,102 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:48:55,102 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:48:55,102 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:48:55,102 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:48:55,103 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:48:55,103 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:48:55,103 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:48:55,103 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:48:55,258 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:48:55,258 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:48:55 BoogieIcfgContainer [2018-01-21 08:48:55,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:48:55,259 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:48:55,259 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:48:55,261 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:48:55,261 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:48:54" (1/3) ... [2018-01-21 08:48:55,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43351e5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:48:55, skipping insertion in model container [2018-01-21 08:48:55,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:48:55" (2/3) ... [2018-01-21 08:48:55,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43351e5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:48:55, skipping insertion in model container [2018-01-21 08:48:55,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:48:55" (3/3) ... [2018-01-21 08:48:55,264 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_true-valid-memsafety_true-termination.c [2018-01-21 08:48:55,270 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:48:55,275 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:48:55,320 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:55,320 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:55,321 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:55,321 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:55,321 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:55,321 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:55,321 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:55,321 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:48:55,322 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:55,342 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:48:55,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:48:55,348 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:55,349 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:48:55,349 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:48:55,354 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 08:48:55,357 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:55,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,406 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:55,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,407 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:55,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:48:55,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:48:55,461 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:48:55,468 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:48:55,473 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:55,473 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:55,473 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:55,473 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:55,473 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:55,473 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:55,473 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:55,473 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:48:55,473 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:55,475 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:48:55,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:48:55,476 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:55,476 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:55,476 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:48:55,476 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 08:48:55,476 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:55,477 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,477 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:55,477 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,477 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:55,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:55,499 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:55,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:55,527 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:55,528 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:48:55,528 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:55,529 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:48:55,544 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:48:55,545 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:55,548 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:48:55,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:55,576 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:48:55,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:48:55,577 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:48:55,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:55,585 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:48:55,585 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:48:55,589 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:55,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:48:55,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:48:55,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:48:55,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:48:55,678 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:48:55,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:55,678 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:48:55,678 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:48:55,678 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:48:55,678 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:48:55,680 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:48:55,680 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:48:55,680 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:48:55,680 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:48:55,681 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:48:55,681 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:48:55,681 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:48:55,681 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:48:55,681 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:48:55,682 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:48:55,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:48:55,684 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:55,684 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:55,684 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:55,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 08:48:55,685 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:55,686 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,686 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:55,686 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,686 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:55,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:55,693 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:55,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:55,703 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:55,703 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:48:55,704 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:55,704 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:48:55,704 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:48:55,704 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:55,705 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:48:55,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:55,709 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:48:55,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:48:55,709 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:48:55,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:55,711 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:48:55,711 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 08:48:55,712 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:48:55,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 08:48:55,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 08:48:55,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 08:48:55,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 08:48:55,720 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 08:48:55,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:55,721 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 08:48:55,721 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:48:55,721 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 08:48:55,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:48:55,721 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:55,722 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:55,722 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:55,722 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 08:48:55,722 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:55,723 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,723 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:55,723 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,723 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:55,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:55,733 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:55,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:55,767 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:48:55,767 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:48:55,767 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:55,768 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:48:55,768 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:48:55,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:48:55,768 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 08:48:55,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:55,816 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 08:48:55,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:48:55,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:48:55,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:55,820 INFO L225 Difference]: With dead ends: 66 [2018-01-21 08:48:55,820 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:48:55,821 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:48:55,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:48:55,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 08:48:55,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 08:48:55,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 08:48:55,831 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 08:48:55,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:55,831 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 08:48:55,832 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:48:55,832 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 08:48:55,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 08:48:55,833 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:55,833 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:55,833 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:55,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 08:48:55,834 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:55,835 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,835 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:55,835 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:55,835 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:55,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:55,853 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:56,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:56,010 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:56,010 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:56,011 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 08:48:56,012 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:48:56,057 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:48:56,057 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:48:58,202 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:48:58,203 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 17 variables. [2018-01-21 08:48:58,211 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:48:58,212 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:58,212 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:48:58,227 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:58,227 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:48:58,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:58,260 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:48:58,458 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:58,459 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:48:58,832 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:48:58,854 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:48:58,854 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [8] total 12 [2018-01-21 08:48:58,854 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:48:58,854 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:48:58,855 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:48:58,855 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:48:58,855 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 08:48:58,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:48:58,983 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 08:48:58,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:48:58,984 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 08:48:58,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:48:58,985 INFO L225 Difference]: With dead ends: 80 [2018-01-21 08:48:58,985 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 08:48:58,986 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2018-01-21 08:48:58,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 08:48:58,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 08:48:58,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 08:48:58,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 08:48:58,991 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 08:48:58,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:48:58,992 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 08:48:58,992 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:48:58,992 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 08:48:58,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 08:48:58,993 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:48:58,994 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:48:58,994 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:48:58,994 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 08:48:58,995 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:48:58,996 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:58,996 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:48:58,996 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:48:58,996 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:48:59,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:48:59,011 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:48:59,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:48:59,064 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:48:59,064 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:48:59,064 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 08:48:59,065 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:48:59,066 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:48:59,067 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:49:00,967 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:49:00,967 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 08:49:00,976 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:49:00,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:00,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:00,991 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:00,991 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:01,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:01,015 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:01,041 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:49:01,041 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:01,085 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:49:01,118 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:01,118 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:01,125 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:01,125 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:01,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:01,159 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:01,164 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:49:01,165 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:01,196 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:49:01,200 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:01,201 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 08:49:01,201 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:01,201 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:49:01,202 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:49:01,202 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:49:01,202 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 5 states. [2018-01-21 08:49:01,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:01,255 INFO L93 Difference]: Finished difference Result 84 states and 94 transitions. [2018-01-21 08:49:01,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:49:01,256 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2018-01-21 08:49:01,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:01,257 INFO L225 Difference]: With dead ends: 84 [2018-01-21 08:49:01,257 INFO L226 Difference]: Without dead ends: 67 [2018-01-21 08:49:01,258 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:49:01,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-01-21 08:49:01,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 52. [2018-01-21 08:49:01,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 08:49:01,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2018-01-21 08:49:01,266 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 36 [2018-01-21 08:49:01,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:01,266 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2018-01-21 08:49:01,266 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:49:01,266 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2018-01-21 08:49:01,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 08:49:01,269 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:01,269 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:01,269 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:01,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1862415341, now seen corresponding path program 2 times [2018-01-21 08:49:01,269 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:01,270 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:01,271 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:01,271 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:01,271 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:01,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:01,291 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:01,339 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 08:49:01,339 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:01,340 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:01,340 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:01,340 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:01,340 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:01,340 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:01,345 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:01,345 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:01,356 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:01,364 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:01,375 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:01,378 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:01,421 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 08:49:01,421 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:01,605 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 08:49:01,626 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:01,626 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:01,630 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:01,630 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:01,643 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:01,661 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:01,676 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:01,680 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:01,702 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 08:49:01,702 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:01,755 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 08:49:01,756 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:01,756 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 08:49:01,757 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:01,757 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:49:01,757 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:49:01,757 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 08:49:01,757 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 10 states. [2018-01-21 08:49:01,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:01,891 INFO L93 Difference]: Finished difference Result 148 states and 168 transitions. [2018-01-21 08:49:01,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 08:49:01,893 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 52 [2018-01-21 08:49:01,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:01,895 INFO L225 Difference]: With dead ends: 148 [2018-01-21 08:49:01,895 INFO L226 Difference]: Without dead ends: 111 [2018-01-21 08:49:01,896 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 193 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:49:01,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-01-21 08:49:01,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 77. [2018-01-21 08:49:01,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 08:49:01,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2018-01-21 08:49:01,906 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 52 [2018-01-21 08:49:01,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:01,907 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2018-01-21 08:49:01,907 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:49:01,907 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2018-01-21 08:49:01,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-01-21 08:49:01,909 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:01,910 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:01,910 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:01,910 INFO L82 PathProgramCache]: Analyzing trace with hash 298957008, now seen corresponding path program 3 times [2018-01-21 08:49:01,910 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:01,911 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:01,911 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:01,912 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:01,912 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:01,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:01,936 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:02,021 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 08:49:02,022 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:02,022 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:02,022 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:02,022 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:02,022 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:02,022 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:02,027 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:02,028 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:02,037 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,040 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,044 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,048 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,049 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:02,053 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:02,096 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-21 08:49:02,096 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:02,221 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 64 proven. 9 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2018-01-21 08:49:02,243 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:02,243 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:02,246 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:02,246 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:02,260 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,270 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,289 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,311 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:02,322 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:02,328 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 08:49:02,345 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:02,380 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 08:49:02,382 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:02,382 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 08:49:02,382 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:02,383 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:49:02,383 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:49:02,383 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:49:02,383 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand 10 states. [2018-01-21 08:49:02,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:02,511 INFO L93 Difference]: Finished difference Result 194 states and 220 transitions. [2018-01-21 08:49:02,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 08:49:02,511 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 78 [2018-01-21 08:49:02,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:02,513 INFO L225 Difference]: With dead ends: 194 [2018-01-21 08:49:02,513 INFO L226 Difference]: Without dead ends: 169 [2018-01-21 08:49:02,514 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 298 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:49:02,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-01-21 08:49:02,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 115. [2018-01-21 08:49:02,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 08:49:02,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 130 transitions. [2018-01-21 08:49:02,525 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 130 transitions. Word has length 78 [2018-01-21 08:49:02,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:02,526 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 130 transitions. [2018-01-21 08:49:02,526 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:49:02,526 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 130 transitions. [2018-01-21 08:49:02,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-01-21 08:49:02,527 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:02,528 INFO L322 BasicCegarLoop]: trace histogram [13, 9, 9, 9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:02,528 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:02,528 INFO L82 PathProgramCache]: Analyzing trace with hash 1844537761, now seen corresponding path program 4 times [2018-01-21 08:49:02,528 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:02,528 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:02,529 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:02,529 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:02,529 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:02,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:02,556 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:02,647 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2018-01-21 08:49:02,647 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:02,647 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:02,648 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:02,648 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:02,648 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:02,648 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:02,655 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:02,656 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:02,688 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:02,693 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:02,811 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 08:49:02,811 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:02,989 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 08:49:03,011 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:03,011 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:03,023 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:03,024 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:03,072 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:03,078 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:03,106 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 08:49:03,106 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:03,228 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 173 proven. 21 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2018-01-21 08:49:03,230 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:03,230 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 11, 11, 11] total 20 [2018-01-21 08:49:03,230 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:03,230 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 08:49:03,230 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 08:49:03,231 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:49:03,231 INFO L87 Difference]: Start difference. First operand 115 states and 130 transitions. Second operand 16 states. [2018-01-21 08:49:03,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:03,468 INFO L93 Difference]: Finished difference Result 311 states and 357 transitions. [2018-01-21 08:49:03,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:49:03,469 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2018-01-21 08:49:03,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:03,473 INFO L225 Difference]: With dead ends: 311 [2018-01-21 08:49:03,473 INFO L226 Difference]: Without dead ends: 241 [2018-01-21 08:49:03,474 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 411 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2018-01-21 08:49:03,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2018-01-21 08:49:03,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 150. [2018-01-21 08:49:03,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-01-21 08:49:03,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 169 transitions. [2018-01-21 08:49:03,493 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 169 transitions. Word has length 109 [2018-01-21 08:49:03,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:03,494 INFO L432 AbstractCegarLoop]: Abstraction has 150 states and 169 transitions. [2018-01-21 08:49:03,494 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 08:49:03,494 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 169 transitions. [2018-01-21 08:49:03,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-01-21 08:49:03,497 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:03,498 INFO L322 BasicCegarLoop]: trace histogram [18, 13, 13, 13, 13, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:03,498 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:03,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1349347824, now seen corresponding path program 5 times [2018-01-21 08:49:03,498 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:03,499 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:03,499 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:03,499 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:03,499 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:03,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:03,526 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:03,648 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 580 trivial. 0 not checked. [2018-01-21 08:49:03,648 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:03,648 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:03,649 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:03,649 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:03,649 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:03,649 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:03,657 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:03,657 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:03,670 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:03,672 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:03,674 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:03,676 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:03,681 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:03,686 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:03,687 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:03,690 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:03,770 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-21 08:49:03,771 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:03,987 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-21 08:49:04,007 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:04,008 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:04,011 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:04,011 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:04,025 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:04,030 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:04,037 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:04,046 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:04,063 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:04,085 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:04,105 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:04,111 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:04,138 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 392 proven. 49 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-01-21 08:49:04,138 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:04,335 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 95 proven. 270 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2018-01-21 08:49:04,337 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:04,337 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11, 11, 11] total 22 [2018-01-21 08:49:04,337 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:04,337 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 08:49:04,337 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 08:49:04,338 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2018-01-21 08:49:04,338 INFO L87 Difference]: Start difference. First operand 150 states and 169 transitions. Second operand 17 states. [2018-01-21 08:49:04,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:04,743 INFO L93 Difference]: Finished difference Result 336 states and 379 transitions. [2018-01-21 08:49:04,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:49:04,744 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 140 [2018-01-21 08:49:04,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:04,745 INFO L225 Difference]: With dead ends: 336 [2018-01-21 08:49:04,745 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 08:49:04,746 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 539 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=243, Invalid=1089, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 08:49:04,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 08:49:04,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 151. [2018-01-21 08:49:04,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-01-21 08:49:04,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 166 transitions. [2018-01-21 08:49:04,757 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 166 transitions. Word has length 140 [2018-01-21 08:49:04,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:04,757 INFO L432 AbstractCegarLoop]: Abstraction has 151 states and 166 transitions. [2018-01-21 08:49:04,757 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 08:49:04,757 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 166 transitions. [2018-01-21 08:49:04,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-01-21 08:49:04,759 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:04,759 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:04,759 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:04,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1936414061, now seen corresponding path program 6 times [2018-01-21 08:49:04,759 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:04,760 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:04,760 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:04,760 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:04,760 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:04,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:04,786 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:04,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 08:49:04,929 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:04,930 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:04,930 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:04,930 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:04,930 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:04,930 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:04,938 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:04,938 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:04,953 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,957 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,960 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,962 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,969 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,974 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,977 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,983 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:04,984 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:04,989 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:05,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 08:49:05,009 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:05,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 08:49:05,182 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:05,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:05,204 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:05,204 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:05,222 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,232 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,249 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,266 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,287 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,313 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,349 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:05,600 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:05,607 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:05,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 08:49:05,623 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:05,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 08:49:05,667 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:05,667 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 08:49:05,667 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:05,668 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:49:05,668 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:49:05,668 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:49:05,668 INFO L87 Difference]: Start difference. First operand 151 states and 166 transitions. Second operand 10 states. [2018-01-21 08:49:05,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:05,737 INFO L93 Difference]: Finished difference Result 237 states and 264 transitions. [2018-01-21 08:49:05,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 08:49:05,737 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 176 [2018-01-21 08:49:05,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:05,739 INFO L225 Difference]: With dead ends: 237 [2018-01-21 08:49:05,739 INFO L226 Difference]: Without dead ends: 200 [2018-01-21 08:49:05,740 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 696 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:49:05,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-01-21 08:49:05,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 160. [2018-01-21 08:49:05,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-01-21 08:49:05,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 177 transitions. [2018-01-21 08:49:05,749 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 177 transitions. Word has length 176 [2018-01-21 08:49:05,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:05,750 INFO L432 AbstractCegarLoop]: Abstraction has 160 states and 177 transitions. [2018-01-21 08:49:05,750 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:49:05,750 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 177 transitions. [2018-01-21 08:49:05,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-01-21 08:49:05,752 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:05,752 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:05,752 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:05,752 INFO L82 PathProgramCache]: Analyzing trace with hash -984621276, now seen corresponding path program 7 times [2018-01-21 08:49:05,752 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:05,753 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:05,753 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:05,753 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:05,753 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:05,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:05,777 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:05,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-21 08:49:05,975 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:05,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:05,976 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:05,976 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:05,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:05,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:05,981 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:05,981 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:06,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:06,029 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:06,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-21 08:49:06,152 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-21 08:49:06,373 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:06,373 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:06,376 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:06,376 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:06,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:06,458 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:06,488 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 1134 proven. 38 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked. [2018-01-21 08:49:06,488 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:06,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1708 backedges. 378 proven. 240 refuted. 0 times theorem prover too weak. 1090 trivial. 0 not checked. [2018-01-21 08:49:06,753 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:06,753 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 08:49:06,753 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:06,754 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 08:49:06,754 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 08:49:06,754 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 08:49:06,754 INFO L87 Difference]: Start difference. First operand 160 states and 177 transitions. Second operand 21 states. [2018-01-21 08:49:07,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:07,208 INFO L93 Difference]: Finished difference Result 392 states and 439 transitions. [2018-01-21 08:49:07,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 08:49:07,209 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 207 [2018-01-21 08:49:07,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:07,211 INFO L225 Difference]: With dead ends: 392 [2018-01-21 08:49:07,211 INFO L226 Difference]: Without dead ends: 305 [2018-01-21 08:49:07,212 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 798 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:49:07,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-01-21 08:49:07,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 200. [2018-01-21 08:49:07,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-01-21 08:49:07,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 222 transitions. [2018-01-21 08:49:07,228 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 222 transitions. Word has length 207 [2018-01-21 08:49:07,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:07,228 INFO L432 AbstractCegarLoop]: Abstraction has 200 states and 222 transitions. [2018-01-21 08:49:07,228 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 08:49:07,229 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 222 transitions. [2018-01-21 08:49:07,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-01-21 08:49:07,232 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:07,233 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:07,233 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:07,233 INFO L82 PathProgramCache]: Analyzing trace with hash 446009255, now seen corresponding path program 8 times [2018-01-21 08:49:07,233 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:07,234 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:07,234 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:07,234 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:07,234 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:07,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:07,267 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:07,427 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 08:49:07,427 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:07,427 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:07,427 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:07,427 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:07,427 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:07,428 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:07,432 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:07,433 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:07,448 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:07,474 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:07,479 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:07,483 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:07,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-21 08:49:07,618 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:07,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-21 08:49:07,880 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:07,881 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:07,889 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:07,889 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:07,912 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:07,962 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:07,998 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:08,006 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:08,044 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 1895 proven. 60 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2018-01-21 08:49:08,044 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:08,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2979 backedges. 623 proven. 360 refuted. 0 times theorem prover too weak. 1996 trivial. 0 not checked. [2018-01-21 08:49:08,225 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:08,225 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 08:49:08,225 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:08,225 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 08:49:08,226 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 08:49:08,226 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 08:49:08,226 INFO L87 Difference]: Start difference. First operand 200 states and 222 transitions. Second operand 24 states. [2018-01-21 08:49:08,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:08,669 INFO L93 Difference]: Finished difference Result 489 states and 547 transitions. [2018-01-21 08:49:08,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 08:49:08,670 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 258 [2018-01-21 08:49:08,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:08,673 INFO L225 Difference]: With dead ends: 489 [2018-01-21 08:49:08,673 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 08:49:08,674 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1055 GetRequests, 997 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 08:49:08,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 08:49:08,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 245. [2018-01-21 08:49:08,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-01-21 08:49:08,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 273 transitions. [2018-01-21 08:49:08,689 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 273 transitions. Word has length 258 [2018-01-21 08:49:08,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:08,689 INFO L432 AbstractCegarLoop]: Abstraction has 245 states and 273 transitions. [2018-01-21 08:49:08,689 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 08:49:08,689 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 273 transitions. [2018-01-21 08:49:08,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-01-21 08:49:08,691 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:08,691 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:08,691 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:08,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1567268592, now seen corresponding path program 9 times [2018-01-21 08:49:08,691 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:08,692 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:08,692 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:08,693 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:08,693 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:08,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:08,720 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:09,039 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 08:49:09,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:09,039 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:09,039 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:09,039 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:09,040 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:09,040 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:09,048 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:09,048 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:09,077 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,081 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,084 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,092 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,097 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,104 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,109 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,115 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,117 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:09,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:09,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 08:49:09,319 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:09,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 08:49:09,720 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:09,720 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:09,723 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:09,724 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:09,762 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,778 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,808 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,844 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:09,909 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:10,042 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:10,305 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:10,786 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:10,812 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:10,820 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:10,876 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 08:49:10,876 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:11,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4821 backedges. 1226 proven. 87 refuted. 0 times theorem prover too weak. 3508 trivial. 0 not checked. [2018-01-21 08:49:11,254 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:11,255 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 08:49:11,255 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:11,255 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 08:49:11,256 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 08:49:11,256 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 08:49:11,256 INFO L87 Difference]: Start difference. First operand 245 states and 273 transitions. Second operand 20 states. [2018-01-21 08:49:11,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:11,742 INFO L93 Difference]: Finished difference Result 564 states and 641 transitions. [2018-01-21 08:49:11,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 08:49:11,742 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 314 [2018-01-21 08:49:11,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:11,746 INFO L225 Difference]: With dead ends: 564 [2018-01-21 08:49:11,746 INFO L226 Difference]: Without dead ends: 515 [2018-01-21 08:49:11,747 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1273 GetRequests, 1236 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 08:49:11,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2018-01-21 08:49:11,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 303. [2018-01-21 08:49:11,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-01-21 08:49:11,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 343 transitions. [2018-01-21 08:49:11,774 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 343 transitions. Word has length 314 [2018-01-21 08:49:11,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:11,775 INFO L432 AbstractCegarLoop]: Abstraction has 303 states and 343 transitions. [2018-01-21 08:49:11,776 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 08:49:11,776 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 343 transitions. [2018-01-21 08:49:11,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-01-21 08:49:11,779 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:11,779 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:11,779 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:11,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1827967461, now seen corresponding path program 10 times [2018-01-21 08:49:11,779 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:11,780 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:11,781 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:11,781 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:11,781 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:11,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:11,825 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:12,179 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-21 08:49:12,179 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:12,180 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:12,180 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:12,180 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:12,180 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:12,180 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:12,185 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:12,185 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:12,255 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:12,259 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:12,487 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-21 08:49:12,487 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:12,900 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-21 08:49:12,921 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:12,921 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:12,924 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:12,924 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:13,059 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:13,069 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:13,134 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 4311 proven. 119 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2018-01-21 08:49:13,135 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:13,421 INFO L134 CoverageAnalysis]: Checked inductivity of 7375 backedges. 1401 proven. 675 refuted. 0 times theorem prover too weak. 5299 trivial. 0 not checked. [2018-01-21 08:49:13,422 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:13,423 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 08:49:13,423 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:13,424 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 08:49:13,424 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 08:49:13,425 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:49:13,425 INFO L87 Difference]: Start difference. First operand 303 states and 343 transitions. Second operand 30 states. [2018-01-21 08:49:14,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:14,182 INFO L93 Difference]: Finished difference Result 751 states and 858 transitions. [2018-01-21 08:49:14,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 08:49:14,182 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 375 [2018-01-21 08:49:14,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:14,187 INFO L225 Difference]: With dead ends: 751 [2018-01-21 08:49:14,187 INFO L226 Difference]: Without dead ends: 618 [2018-01-21 08:49:14,189 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1529 GetRequests, 1455 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 08:49:14,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2018-01-21 08:49:14,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 358. [2018-01-21 08:49:14,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 358 states. [2018-01-21 08:49:14,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 403 transitions. [2018-01-21 08:49:14,217 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 403 transitions. Word has length 375 [2018-01-21 08:49:14,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:14,217 INFO L432 AbstractCegarLoop]: Abstraction has 358 states and 403 transitions. [2018-01-21 08:49:14,218 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 08:49:14,218 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 403 transitions. [2018-01-21 08:49:14,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2018-01-21 08:49:14,221 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:14,221 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:14,221 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:14,222 INFO L82 PathProgramCache]: Analyzing trace with hash -940109232, now seen corresponding path program 11 times [2018-01-21 08:49:14,222 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:14,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:14,223 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:14,223 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:14,223 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:14,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:14,264 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:14,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-21 08:49:14,647 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:14,647 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:14,647 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:14,647 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:14,647 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:14,647 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:14,654 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:14,654 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:14,677 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,682 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,688 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,695 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,702 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,710 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,717 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,724 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:14,725 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:14,730 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:14,981 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6200 proven. 517 refuted. 0 times theorem prover too weak. 3763 trivial. 0 not checked. [2018-01-21 08:49:14,982 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:15,546 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 1065 proven. 2348 refuted. 0 times theorem prover too weak. 7067 trivial. 0 not checked. [2018-01-21 08:49:15,566 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:15,567 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:15,569 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:15,570 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:15,596 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:15,606 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:15,628 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:15,667 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:15,805 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:15,890 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:15,995 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:16,126 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:16,164 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:16,174 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:16,327 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 6116 proven. 427 refuted. 0 times theorem prover too weak. 3937 trivial. 0 not checked. [2018-01-21 08:49:16,327 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:16,770 INFO L134 CoverageAnalysis]: Checked inductivity of 10480 backedges. 971 proven. 1932 refuted. 0 times theorem prover too weak. 7577 trivial. 0 not checked. [2018-01-21 08:49:16,773 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:16,774 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 47 [2018-01-21 08:49:16,774 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:16,775 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 08:49:16,775 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 08:49:16,775 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1871, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 08:49:16,776 INFO L87 Difference]: Start difference. First operand 358 states and 403 transitions. Second operand 31 states. [2018-01-21 08:49:18,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:18,912 INFO L93 Difference]: Finished difference Result 835 states and 939 transitions. [2018-01-21 08:49:18,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-01-21 08:49:18,912 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 436 [2018-01-21 08:49:18,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:18,916 INFO L225 Difference]: With dead ends: 835 [2018-01-21 08:49:18,916 INFO L226 Difference]: Without dead ends: 469 [2018-01-21 08:49:18,919 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1785 GetRequests, 1693 SyntacticMatches, 18 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1741 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=906, Invalid=4794, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 08:49:18,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-01-21 08:49:18,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 364. [2018-01-21 08:49:18,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2018-01-21 08:49:18,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 400 transitions. [2018-01-21 08:49:18,949 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 400 transitions. Word has length 436 [2018-01-21 08:49:18,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:18,950 INFO L432 AbstractCegarLoop]: Abstraction has 364 states and 400 transitions. [2018-01-21 08:49:18,950 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 08:49:18,950 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 400 transitions. [2018-01-21 08:49:18,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 493 [2018-01-21 08:49:18,954 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:18,954 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:18,954 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:18,955 INFO L82 PathProgramCache]: Analyzing trace with hash 270709555, now seen corresponding path program 12 times [2018-01-21 08:49:18,955 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:18,955 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:18,955 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:18,956 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:18,956 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:19,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:19,004 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:19,606 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-21 08:49:19,606 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:19,606 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:19,606 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:19,607 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:19,607 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:19,607 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:19,614 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:19,615 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:19,652 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,658 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,662 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,669 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,675 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,684 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,693 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,705 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,718 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,730 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,745 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,760 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,775 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,790 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,809 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,823 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,839 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,860 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,880 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:19,883 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:19,892 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:20,323 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-21 08:49:20,323 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:21,841 INFO L134 CoverageAnalysis]: Checked inductivity of 13772 backedges. 2797 proven. 156 refuted. 0 times theorem prover too weak. 10819 trivial. 0 not checked. [2018-01-21 08:49:21,875 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:21,876 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:21,879 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:21,879 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:21,916 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:21,933 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:21,964 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:22,005 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:22,075 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:22,266 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:23,128 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:26,466 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:38,502 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown