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.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:52:04,271 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:52:04,310 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:52:04,325 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:52:04,326 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:52:04,327 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:52:04,328 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:52:04,329 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:52:04,331 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:52:04,332 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:52:04,333 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:52:04,333 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:52:04,334 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:52:04,335 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:52:04,336 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:52:04,339 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:52:04,341 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:52:04,343 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:52:04,344 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:52:04,345 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:52:04,347 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-20 23:52:04,348 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-20 23:52:04,348 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-20 23:52:04,349 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-20 23:52:04,350 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-20 23:52:04,351 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-20 23:52:04,351 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-20 23:52:04,352 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-20 23:52:04,352 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-20 23:52:04,352 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:52:04,353 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:52:04,353 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.epf [2018-01-20 23:52:04,362 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:52:04,362 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:52:04,363 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:52:04,363 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:52:04,363 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:52:04,363 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:52:04,363 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:52:04,364 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:52:04,364 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:52:04,364 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:52:04,364 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:52:04,364 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:52:04,364 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:52:04,365 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:52:04,365 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:52:04,366 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:52:04,366 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:52:04,366 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:52:04,366 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:52:04,366 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:52:04,367 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:52:04,367 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:52:04,368 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:52:04,368 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:52:04,368 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:52:04,368 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:52:04,400 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:52:04,410 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:52:04,413 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:52:04,414 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:52:04,415 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:52:04,415 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-20 23:52:04,535 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:52:04,539 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:52:04,540 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:52:04,540 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:52:04,545 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:52:04,546 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,549 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1285ed85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04, skipping insertion in model container [2018-01-20 23:52:04,549 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,562 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:52:04,576 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:52:04,688 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:52:04,704 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:52:04,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04 WrapperNode [2018-01-20 23:52:04,710 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:52:04,711 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:52:04,711 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:52:04,711 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:52:04,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,722 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,729 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,733 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,737 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (1/1) ... [2018-01-20 23:52:04,740 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:52:04,740 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:52:04,740 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:52:04,741 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:52:04,741 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (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 [2018-01-20 23:52:04,784 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:52:04,784 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:52:04,785 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:52:04,785 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:52:04,785 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:52:04,785 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:52:04,785 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:52:04,785 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:52:04,785 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:52:04,786 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:52:04,786 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:52:04,786 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:52:04,786 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:52:04,985 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:52:04,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:52:04 BoogieIcfgContainer [2018-01-20 23:52:04,986 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:52:04,986 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:52:04,986 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:52:04,988 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:52:04,988 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:52:04" (1/3) ... [2018-01-20 23:52:04,989 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15216911 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:52:04, skipping insertion in model container [2018-01-20 23:52:04,989 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:04" (2/3) ... [2018-01-20 23:52:04,990 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15216911 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:52:04, skipping insertion in model container [2018-01-20 23:52:04,990 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:52:04" (3/3) ... [2018-01-20 23:52:04,992 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-20 23:52:04,998 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:52:05,004 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:52:05,046 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:05,046 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:05,047 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:05,047 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:05,047 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:05,047 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:05,047 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:05,047 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:52:05,048 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:05,064 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:52:05,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:52:05,069 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:05,070 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:52:05,070 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:52:05,074 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-20 23:52:05,076 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:05,116 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,116 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:05,116 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,116 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:05,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:52:05,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:52:05,170 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:52:05,176 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:52:05,182 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:05,182 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:05,182 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:05,182 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:05,182 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:05,183 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:05,183 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:05,183 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:52:05,183 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:05,185 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:52:05,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:52:05,186 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:05,187 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:05,187 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:52:05,187 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-20 23:52:05,187 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:05,188 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,189 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:05,189 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,189 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:05,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:05,214 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:05,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:05,250 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:05,250 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:52:05,251 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:05,253 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:52:05,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:52:05,268 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:05,270 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:52:05,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:05,292 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:52:05,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:52:05,293 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:52:05,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:05,299 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:52:05,299 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:52:05,302 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 [2018-01-20 23:52:05,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:52:05,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:52:05,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:52:05,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:52:05,390 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:52:05,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:05,390 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:52:05,390 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:52:05,390 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:52:05,390 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:52:05,393 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:05,393 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:05,393 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:05,394 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:05,394 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:05,394 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:05,394 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:05,394 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:52:05,394 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:05,396 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-20 23:52:05,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:52:05,397 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:05,398 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:05,398 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:05,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-20 23:52:05,398 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:05,399 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,399 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:05,399 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,400 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:05,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:05,409 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:05,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:05,423 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:05,423 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:52:05,423 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:05,423 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:52:05,424 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:52:05,424 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:05,424 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-20 23:52:05,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:05,431 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-20 23:52:05,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:52:05,431 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:52:05,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:05,433 INFO L225 Difference]: With dead ends: 72 [2018-01-20 23:52:05,433 INFO L226 Difference]: Without dead ends: 37 [2018-01-20 23:52:05,434 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 [2018-01-20 23:52:05,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-20 23:52:05,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-20 23:52:05,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-20 23:52:05,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-20 23:52:05,445 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-20 23:52:05,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:05,445 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-20 23:52:05,445 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:52:05,446 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-20 23:52:05,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:52:05,446 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:05,447 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:05,447 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:05,447 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-20 23:52:05,447 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:05,448 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,448 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:05,449 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,449 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:05,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:05,461 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:05,498 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:05,498 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:05,498 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:52:05,498 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:05,500 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:52:05,500 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:52:05,500 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:52:05,500 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-20 23:52:05,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:05,547 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-20 23:52:05,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:52:05,548 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:52:05,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:05,554 INFO L225 Difference]: With dead ends: 66 [2018-01-20 23:52:05,554 INFO L226 Difference]: Without dead ends: 51 [2018-01-20 23:52:05,555 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 [2018-01-20 23:52:05,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-20 23:52:05,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-20 23:52:05,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-20 23:52:05,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-20 23:52:05,568 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-20 23:52:05,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:05,568 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-20 23:52:05,568 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:52:05,569 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-20 23:52:05,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-20 23:52:05,570 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:05,570 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] [2018-01-20 23:52:05,570 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:05,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-20 23:52:05,570 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:05,571 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,572 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:05,572 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:05,572 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:05,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:05,592 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:05,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:05,715 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:05,715 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:05,716 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-20 23:52:05,717 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] [2018-01-20 23:52:05,762 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:52:05,762 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:52:07,185 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:52:07,186 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 18 variables. [2018-01-20 23:52:07,200 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:52:07,200 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:07,200 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 [2018-01-20 23:52:07,214 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:07,215 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:07,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:07,244 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:07,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:07,289 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:07,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:07,394 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:07,395 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:07,403 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:07,403 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:07,439 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:07,445 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:07,445 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:07,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:07,487 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:07,487 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 4, 4] total 12 [2018-01-20 23:52:07,487 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:07,488 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:52:07,488 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:52:07,489 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-01-20 23:52:07,489 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-01-20 23:52:07,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:07,785 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2018-01-20 23:52:07,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:52:07,786 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-01-20 23:52:07,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:07,788 INFO L225 Difference]: With dead ends: 96 [2018-01-20 23:52:07,788 INFO L226 Difference]: Without dead ends: 79 [2018-01-20 23:52:07,789 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:52:07,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-20 23:52:07,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 50. [2018-01-20 23:52:07,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-20 23:52:07,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-01-20 23:52:07,797 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 31 [2018-01-20 23:52:07,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:07,798 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-01-20 23:52:07,798 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:52:07,798 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-01-20 23:52:07,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-20 23:52:07,800 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:07,800 INFO L322 BasicCegarLoop]: trace histogram [3, 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] [2018-01-20 23:52:07,801 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:07,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1947199059, now seen corresponding path program 2 times [2018-01-20 23:52:07,801 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:07,802 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:07,802 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:07,802 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:07,802 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:07,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:07,822 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:07,896 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-20 23:52:07,896 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:07,897 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:07,897 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:07,897 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:07,897 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:07,897 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:07,905 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:07,905 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:07,921 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:07,931 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:07,933 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:07,936 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:07,993 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-20 23:52:07,994 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:08,129 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-20 23:52:08,162 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-20 23:52:08,163 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-20 23:52:08,163 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:08,163 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-20 23:52:08,164 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-20 23:52:08,164 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-20 23:52:08,164 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-01-20 23:52:08,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:08,321 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-01-20 23:52:08,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:52:08,322 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2018-01-20 23:52:08,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:08,323 INFO L225 Difference]: With dead ends: 98 [2018-01-20 23:52:08,323 INFO L226 Difference]: Without dead ends: 63 [2018-01-20 23:52:08,324 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:52:08,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-20 23:52:08,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-01-20 23:52:08,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-20 23:52:08,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2018-01-20 23:52:08,331 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 42 [2018-01-20 23:52:08,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:08,332 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2018-01-20 23:52:08,332 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-20 23:52:08,332 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2018-01-20 23:52:08,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-20 23:52:08,333 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:08,334 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:08,334 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:08,334 INFO L82 PathProgramCache]: Analyzing trace with hash 84514625, now seen corresponding path program 1 times [2018-01-20 23:52:08,334 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:08,335 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:08,335 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:08,335 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:08,336 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:08,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:08,354 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:08,398 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:08,398 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:08,398 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:08,398 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-20 23:52:08,399 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] [2018-01-20 23:52:08,400 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:52:08,400 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:52:09,217 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:52:09,217 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. [2018-01-20 23:52:09,219 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:52:09,220 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:09,220 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:52:09,227 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:09,227 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:09,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:09,253 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:09,267 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:09,267 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:09,306 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:09,342 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:09,342 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 [2018-01-20 23:52:09,351 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:09,351 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:09,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:09,398 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:09,404 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:09,405 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:09,440 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:09,442 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:09,442 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-20 23:52:09,442 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:09,443 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-20 23:52:09,443 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-20 23:52:09,443 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-20 23:52:09,443 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 6 states. [2018-01-20 23:52:09,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:09,502 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2018-01-20 23:52:09,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:52:09,502 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-20 23:52:09,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:09,504 INFO L225 Difference]: With dead ends: 105 [2018-01-20 23:52:09,504 INFO L226 Difference]: Without dead ends: 84 [2018-01-20 23:52:09,505 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-20 23:52:09,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-20 23:52:09,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 64. [2018-01-20 23:52:09,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-20 23:52:09,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2018-01-20 23:52:09,513 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 47 [2018-01-20 23:52:09,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:09,514 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2018-01-20 23:52:09,514 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-20 23:52:09,514 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2018-01-20 23:52:09,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-01-20 23:52:09,516 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:09,516 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:09,516 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:09,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1267511486, now seen corresponding path program 2 times [2018-01-20 23:52:09,516 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:09,517 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:09,517 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:09,517 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:09,518 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:09,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:09,538 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:09,596 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:52:09,596 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:09,597 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:09,597 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:09,597 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:09,597 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:09,597 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 [2018-01-20 23:52:09,607 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:09,607 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:09,626 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:09,639 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:09,642 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:09,645 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:09,736 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-20 23:52:09,736 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:09,934 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-20 23:52:09,967 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:09,968 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 [2018-01-20 23:52:09,974 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:09,974 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:09,993 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:10,021 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:10,042 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:10,048 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:10,088 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:52:10,088 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:10,166 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:52:10,168 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:10,168 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-20 23:52:10,168 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:10,169 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-20 23:52:10,169 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-20 23:52:10,169 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:52:10,170 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand 12 states. [2018-01-20 23:52:10,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:10,402 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2018-01-20 23:52:10,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:52:10,402 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-01-20 23:52:10,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:10,403 INFO L225 Difference]: With dead ends: 172 [2018-01-20 23:52:10,403 INFO L226 Difference]: Without dead ends: 128 [2018-01-20 23:52:10,404 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 234 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-20 23:52:10,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-20 23:52:10,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 89. [2018-01-20 23:52:10,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-20 23:52:10,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-01-20 23:52:10,416 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2018-01-20 23:52:10,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:10,416 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-01-20 23:52:10,417 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-20 23:52:10,417 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-01-20 23:52:10,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-20 23:52:10,419 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:10,419 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 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] [2018-01-20 23:52:10,419 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:10,419 INFO L82 PathProgramCache]: Analyzing trace with hash 86499937, now seen corresponding path program 3 times [2018-01-20 23:52:10,419 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:10,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:10,420 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:10,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:10,421 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:10,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:10,445 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:10,597 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-20 23:52:10,597 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:10,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:10,598 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:10,598 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:10,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:10,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:52:10,616 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:10,616 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:10,627 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:10,632 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:10,636 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:10,641 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:10,643 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:10,646 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:10,696 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-20 23:52:10,697 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:10,915 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-20 23:52:10,939 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:10,940 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 [2018-01-20 23:52:10,943 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:10,944 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:10,955 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:10,965 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:10,983 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:11,010 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:11,022 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:11,027 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:11,040 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-20 23:52:11,041 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:11,112 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-20 23:52:11,114 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:11,114 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-20 23:52:11,114 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:11,115 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-20 23:52:11,115 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-20 23:52:11,115 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:52:11,115 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 11 states. [2018-01-20 23:52:11,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:11,336 INFO L93 Difference]: Finished difference Result 215 states and 249 transitions. [2018-01-20 23:52:11,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:52:11,336 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 89 [2018-01-20 23:52:11,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:11,337 INFO L225 Difference]: With dead ends: 215 [2018-01-20 23:52:11,337 INFO L226 Difference]: Without dead ends: 186 [2018-01-20 23:52:11,338 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:52:11,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-20 23:52:11,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 127. [2018-01-20 23:52:11,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-01-20 23:52:11,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 147 transitions. [2018-01-20 23:52:11,349 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 147 transitions. Word has length 89 [2018-01-20 23:52:11,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:11,349 INFO L432 AbstractCegarLoop]: Abstraction has 127 states and 147 transitions. [2018-01-20 23:52:11,350 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-20 23:52:11,350 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 147 transitions. [2018-01-20 23:52:11,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-01-20 23:52:11,352 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:11,352 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 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] [2018-01-20 23:52:11,352 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:11,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1835683312, now seen corresponding path program 4 times [2018-01-20 23:52:11,353 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:11,353 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:11,353 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:11,353 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:11,353 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:11,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:11,380 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:11,598 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-20 23:52:11,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:11,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:11,598 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:11,598 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:11,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:11,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:52:11,607 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:11,607 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:11,637 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:11,641 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:11,837 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:52:11,838 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:12,034 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:52:12,055 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:12,055 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 [2018-01-20 23:52:12,058 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:12,058 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:12,104 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:12,109 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:12,124 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:52:12,124 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:12,240 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:52:12,241 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:12,241 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-20 23:52:12,241 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:12,242 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:52:12,242 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:52:12,242 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:52:12,242 INFO L87 Difference]: Start difference. First operand 127 states and 147 transitions. Second operand 18 states. [2018-01-20 23:52:12,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:12,576 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-01-20 23:52:12,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-20 23:52:12,576 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 120 [2018-01-20 23:52:12,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:12,578 INFO L225 Difference]: With dead ends: 335 [2018-01-20 23:52:12,578 INFO L226 Difference]: Without dead ends: 258 [2018-01-20 23:52:12,579 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 452 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-20 23:52:12,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-01-20 23:52:12,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 162. [2018-01-20 23:52:12,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-20 23:52:12,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2018-01-20 23:52:12,594 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 120 [2018-01-20 23:52:12,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:12,595 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2018-01-20 23:52:12,595 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:52:12,595 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2018-01-20 23:52:12,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-01-20 23:52:12,597 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:12,597 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 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] [2018-01-20 23:52:12,597 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:12,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1639693249, now seen corresponding path program 5 times [2018-01-20 23:52:12,598 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:12,599 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:12,599 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:12,599 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:12,599 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:12,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:12,632 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:12,776 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-20 23:52:12,777 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:12,777 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:12,777 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:12,777 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:12,777 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:12,777 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 [2018-01-20 23:52:12,783 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:12,783 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:12,796 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:12,800 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:12,804 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:12,807 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:12,812 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:12,818 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:12,819 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:12,822 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:12,939 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-20 23:52:12,939 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:13,230 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-20 23:52:13,251 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:13,251 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 [2018-01-20 23:52:13,254 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:13,254 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:13,265 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:13,271 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:13,282 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:13,296 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:13,318 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:13,346 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:13,365 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:13,371 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:13,394 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-20 23:52:13,394 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:13,628 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-20 23:52:13,629 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:13,630 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-20 23:52:13,630 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:13,630 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:52:13,630 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:52:13,630 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:52:13,631 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand 18 states. [2018-01-20 23:52:14,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:14,046 INFO L93 Difference]: Finished difference Result 376 states and 433 transitions. [2018-01-20 23:52:14,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:52:14,046 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 151 [2018-01-20 23:52:14,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:14,048 INFO L225 Difference]: With dead ends: 376 [2018-01-20 23:52:14,048 INFO L226 Difference]: Without dead ends: 225 [2018-01-20 23:52:14,049 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 583 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-20 23:52:14,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-01-20 23:52:14,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 166. [2018-01-20 23:52:14,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-20 23:52:14,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2018-01-20 23:52:14,063 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 151 [2018-01-20 23:52:14,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:14,064 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2018-01-20 23:52:14,064 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:52:14,064 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2018-01-20 23:52:14,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-01-20 23:52:14,066 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:14,066 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 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] [2018-01-20 23:52:14,066 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:14,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1261295644, now seen corresponding path program 6 times [2018-01-20 23:52:14,067 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:14,068 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,068 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:14,068 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:14,068 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:14,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:14,100 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:14,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:52:14,267 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:14,267 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:14,268 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:14,268 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:14,268 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:14,268 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 [2018-01-20 23:52:14,274 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:14,274 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:14,290 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,293 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,296 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,305 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,311 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,316 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,322 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,329 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,331 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:14,334 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:14,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:52:14,385 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:14,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:52:14,519 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:14,519 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 [2018-01-20 23:52:14,522 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:14,522 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:14,539 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,548 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,564 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,589 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,623 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,671 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,743 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:14,882 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:15,065 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:15,101 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:15,109 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:15,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:52:15,148 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:15,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:52:15,235 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:15,236 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-20 23:52:15,236 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:15,236 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-20 23:52:15,237 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-20 23:52:15,237 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:52:15,237 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand 11 states. [2018-01-20 23:52:15,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:15,362 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-01-20 23:52:15,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-20 23:52:15,363 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 187 [2018-01-20 23:52:15,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:15,365 INFO L225 Difference]: With dead ends: 261 [2018-01-20 23:52:15,365 INFO L226 Difference]: Without dead ends: 220 [2018-01-20 23:52:15,366 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:52:15,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-20 23:52:15,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 175. [2018-01-20 23:52:15,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-01-20 23:52:15,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-01-20 23:52:15,381 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 187 [2018-01-20 23:52:15,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:15,381 INFO L432 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-01-20 23:52:15,382 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-20 23:52:15,382 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-01-20 23:52:15,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-01-20 23:52:15,385 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:15,385 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 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] [2018-01-20 23:52:15,385 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:15,385 INFO L82 PathProgramCache]: Analyzing trace with hash 2078734259, now seen corresponding path program 7 times [2018-01-20 23:52:15,385 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:15,386 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:15,386 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:15,386 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:15,386 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:15,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:15,419 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:15,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-20 23:52:15,638 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:15,638 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:15,639 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:15,639 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:15,639 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:15,639 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 [2018-01-20 23:52:15,645 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:15,645 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:15,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:15,698 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:15,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-20 23:52:15,896 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:16,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-20 23:52:16,153 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:16,153 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 [2018-01-20 23:52:16,156 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:16,156 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:16,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:16,256 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:16,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-20 23:52:16,286 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:16,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-20 23:52:16,458 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:16,458 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-20 23:52:16,458 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:16,459 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-20 23:52:16,459 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-20 23:52:16,460 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-20 23:52:16,460 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-01-20 23:52:16,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:16,863 INFO L93 Difference]: Finished difference Result 454 states and 513 transitions. [2018-01-20 23:52:16,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-20 23:52:16,863 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 218 [2018-01-20 23:52:16,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:16,866 INFO L225 Difference]: With dead ends: 454 [2018-01-20 23:52:16,866 INFO L226 Difference]: Without dead ends: 360 [2018-01-20 23:52:16,867 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 839 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:52:16,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-01-20 23:52:16,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 215. [2018-01-20 23:52:16,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-01-20 23:52:16,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2018-01-20 23:52:16,886 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 218 [2018-01-20 23:52:16,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:16,886 INFO L432 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2018-01-20 23:52:16,886 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-20 23:52:16,886 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2018-01-20 23:52:16,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-01-20 23:52:16,889 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:16,889 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 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] [2018-01-20 23:52:16,889 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:16,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1659522376, now seen corresponding path program 8 times [2018-01-20 23:52:16,890 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:16,891 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:16,891 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:16,891 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:16,891 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:16,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:16,931 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:17,200 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-20 23:52:17,200 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:17,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:17,201 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:17,201 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:17,201 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:17,201 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-01-20 23:52:17,206 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:17,207 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:17,227 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:17,271 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:17,277 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:17,284 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:17,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-20 23:52:17,788 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:18,131 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-20 23:52:18,152 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:18,153 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 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 [2018-01-20 23:52:18,156 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:18,156 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:18,180 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:18,242 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:18,286 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:18,297 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:18,363 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-20 23:52:18,363 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:18,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-20 23:52:18,603 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:18,603 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-20 23:52:18,603 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:18,604 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-20 23:52:18,604 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-20 23:52:18,604 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:52:18,605 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand 26 states. [2018-01-20 23:52:19,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:19,249 INFO L93 Difference]: Finished difference Result 559 states and 631 transitions. [2018-01-20 23:52:19,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-20 23:52:19,250 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 269 [2018-01-20 23:52:19,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:19,253 INFO L225 Difference]: With dead ends: 559 [2018-01-20 23:52:19,253 INFO L226 Difference]: Without dead ends: 453 [2018-01-20 23:52:19,254 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 1038 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:52:19,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-01-20 23:52:19,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 260. [2018-01-20 23:52:19,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2018-01-20 23:52:19,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 296 transitions. [2018-01-20 23:52:19,271 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 296 transitions. Word has length 269 [2018-01-20 23:52:19,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:19,271 INFO L432 AbstractCegarLoop]: Abstraction has 260 states and 296 transitions. [2018-01-20 23:52:19,271 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-20 23:52:19,272 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 296 transitions. [2018-01-20 23:52:19,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-01-20 23:52:19,276 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:19,276 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 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] [2018-01-20 23:52:19,276 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:19,277 INFO L82 PathProgramCache]: Analyzing trace with hash 469392129, now seen corresponding path program 9 times [2018-01-20 23:52:19,277 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:19,277 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:19,277 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:19,278 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:19,278 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:19,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:19,308 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:19,594 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-20 23:52:19,595 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:19,595 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:19,595 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:19,595 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:19,595 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:19,595 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 [2018-01-20 23:52:19,601 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:19,602 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:19,629 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,633 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,636 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,641 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,646 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,651 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,658 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,666 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:19,667 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:19,672 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:19,807 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-20 23:52:19,808 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:20,116 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-20 23:52:20,137 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:20,137 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 [2018-01-20 23:52:20,140 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:20,141 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:20,166 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:20,180 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:20,199 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:20,233 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:20,302 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:20,473 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:20,822 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:21,396 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:21,439 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:21,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:21,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-20 23:52:21,533 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:21,771 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-20 23:52:21,773 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:21,773 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-20 23:52:21,773 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:21,774 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:52:21,774 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:52:21,774 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-20 23:52:21,774 INFO L87 Difference]: Start difference. First operand 260 states and 296 transitions. Second operand 21 states. [2018-01-20 23:52:22,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:22,135 INFO L93 Difference]: Finished difference Result 639 states and 732 transitions. [2018-01-20 23:52:22,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-20 23:52:22,135 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 325 [2018-01-20 23:52:22,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:22,139 INFO L225 Difference]: With dead ends: 639 [2018-01-20 23:52:22,139 INFO L226 Difference]: Without dead ends: 586 [2018-01-20 23:52:22,141 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1318 GetRequests, 1280 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:52:22,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2018-01-20 23:52:22,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 318. [2018-01-20 23:52:22,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-01-20 23:52:22,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 367 transitions. [2018-01-20 23:52:22,168 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 367 transitions. Word has length 325 [2018-01-20 23:52:22,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:22,169 INFO L432 AbstractCegarLoop]: Abstraction has 318 states and 367 transitions. [2018-01-20 23:52:22,169 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:52:22,169 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 367 transitions. [2018-01-20 23:52:22,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-01-20 23:52:22,172 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:22,173 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 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] [2018-01-20 23:52:22,173 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:22,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1594188886, now seen corresponding path program 10 times [2018-01-20 23:52:22,173 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:22,174 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:22,174 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:22,174 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:22,174 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:22,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:22,223 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:22,590 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-20 23:52:22,590 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:22,590 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:22,591 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:22,591 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:22,591 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:22,591 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 [2018-01-20 23:52:22,596 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:22,596 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:22,657 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:22,662 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:22,914 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-20 23:52:22,914 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:23,315 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-20 23:52:23,335 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:23,335 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 [2018-01-20 23:52:23,338 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:52:23,338 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:52:23,467 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:23,481 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:23,567 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-20 23:52:23,568 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:23,906 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-20 23:52:23,908 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:23,908 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-20 23:52:23,909 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:23,909 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:52:23,909 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:52:23,910 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-20 23:52:23,910 INFO L87 Difference]: Start difference. First operand 318 states and 367 transitions. Second operand 32 states. [2018-01-20 23:52:25,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:25,150 INFO L93 Difference]: Finished difference Result 837 states and 962 transitions. [2018-01-20 23:52:25,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-20 23:52:25,151 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 386 [2018-01-20 23:52:25,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:25,154 INFO L225 Difference]: With dead ends: 837 [2018-01-20 23:52:25,154 INFO L226 Difference]: Without dead ends: 697 [2018-01-20 23:52:25,155 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1496 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-20 23:52:25,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-01-20 23:52:25,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 373. [2018-01-20 23:52:25,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-01-20 23:52:25,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 428 transitions. [2018-01-20 23:52:25,178 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 428 transitions. Word has length 386 [2018-01-20 23:52:25,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:25,178 INFO L432 AbstractCegarLoop]: Abstraction has 373 states and 428 transitions. [2018-01-20 23:52:25,179 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:52:25,179 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 428 transitions. [2018-01-20 23:52:25,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2018-01-20 23:52:25,182 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:25,182 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 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] [2018-01-20 23:52:25,182 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:25,182 INFO L82 PathProgramCache]: Analyzing trace with hash -655925471, now seen corresponding path program 11 times [2018-01-20 23:52:25,182 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:25,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:25,183 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:25,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:25,183 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:25,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:25,219 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:25,728 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-20 23:52:25,728 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:25,729 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:25,729 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:25,729 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:25,729 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:25,729 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 [2018-01-20 23:52:25,735 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:25,736 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:25,763 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,775 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,793 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,806 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,825 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,842 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,857 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,875 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:25,888 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:25,893 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:26,276 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-20 23:52:26,276 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:26,904 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-20 23:52:26,924 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:26,924 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 [2018-01-20 23:52:26,928 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:52:26,928 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:26,964 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:26,979 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,011 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,061 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,155 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,338 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,570 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,884 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:27,942 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:27,956 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:28,044 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-20 23:52:28,044 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:28,560 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-20 23:52:28,563 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:28,563 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19, 19, 19] total 40 [2018-01-20 23:52:28,563 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:28,564 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:52:28,564 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:52:28,564 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1305, Unknown=0, NotChecked=0, Total=1560 [2018-01-20 23:52:28,564 INFO L87 Difference]: Start difference. First operand 373 states and 428 transitions. Second operand 32 states. [2018-01-20 23:52:30,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:30,557 INFO L93 Difference]: Finished difference Result 727 states and 820 transitions. [2018-01-20 23:52:30,557 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-20 23:52:30,558 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 447 [2018-01-20 23:52:30,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:30,561 INFO L225 Difference]: With dead ends: 727 [2018-01-20 23:52:30,561 INFO L226 Difference]: Without dead ends: 575 [2018-01-20 23:52:30,563 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1842 GetRequests, 1753 SyntacticMatches, 22 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2018-01-20 23:52:30,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2018-01-20 23:52:30,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 374. [2018-01-20 23:52:30,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-01-20 23:52:30,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2018-01-20 23:52:30,582 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 447 [2018-01-20 23:52:30,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:30,582 INFO L432 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2018-01-20 23:52:30,582 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:52:30,582 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2018-01-20 23:52:30,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-01-20 23:52:30,585 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:30,585 INFO L322 BasicCegarLoop]: trace histogram [81, 68, 68, 68, 68, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:30,585 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:30,585 INFO L82 PathProgramCache]: Analyzing trace with hash 832198916, now seen corresponding path program 12 times [2018-01-20 23:52:30,585 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:30,586 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:30,586 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:30,586 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:30,586 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:30,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:30,625 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:31,214 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 0 proven. 416 refuted. 0 times theorem prover too weak. 13626 trivial. 0 not checked. [2018-01-20 23:52:31,214 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:31,214 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:31,214 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:31,215 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:31,215 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:31,215 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:31,221 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:31,221 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:31,252 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,257 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,261 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,268 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,273 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,280 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,287 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,296 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,305 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,314 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,324 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,334 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,354 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,370 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,388 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,412 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:31,416 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:31,424 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:31,784 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-20 23:52:31,784 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:31,976 WARN L143 SmtUtils]: Spent 105ms on a formula simplification that was a NOOP. DAG size: 34 [2018-01-20 23:52:32,189 WARN L143 SmtUtils]: Spent 113ms on a formula simplification that was a NOOP. DAG size: 36 [2018-01-20 23:52:34,113 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-20 23:52:34,135 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:34,135 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 28 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 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:34,139 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:52:34,139 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:52:34,180 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:34,193 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:34,229 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:34,284 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:34,435 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:34,823 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:37,985 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:52:41,399 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