java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength2_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:41:16,263 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:41:16,265 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:41:16,281 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:41:16,281 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:41:16,282 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:41:16,283 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:41:16,285 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:41:16,286 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:41:16,287 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:41:16,287 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:41:16,288 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:41:16,288 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:41:16,289 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:41:16,290 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:41:16,292 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:41:16,294 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:41:16,296 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:41:16,297 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:41:16,299 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:41:16,301 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:41:16,306 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:41:16,307 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:41:16,307 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf [2018-01-21 08:41:16,317 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:41:16,317 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:41:16,318 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:41:16,318 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:41:16,318 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:41:16,319 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:41:16,319 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:41:16,319 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:41:16,319 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:41:16,320 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:41:16,320 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:41:16,320 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:41:16,320 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:41:16,321 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:41:16,321 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:41:16,321 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:41:16,321 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:41:16,321 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:41:16,322 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:41:16,322 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:41:16,322 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:41:16,322 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:41:16,322 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:41:16,323 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:41:16,323 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:41:16,323 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:41:16,323 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:41:16,323 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:41:16,324 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:41:16,324 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:41:16,324 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:41:16,324 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:41:16,324 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:41:16,325 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:41:16,325 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:41:16,325 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:41:16,325 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:41:16,325 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:41:16,326 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:41:16,326 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:41:16,361 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:41:16,374 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:41:16,378 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:41:16,380 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:41:16,381 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:41:16,381 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength2_false-valid-deref-write.c [2018-01-21 08:41:16,530 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:41:16,536 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:41:16,537 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:41:16,537 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:41:16,544 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:41:16,545 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,548 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e1b55b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16, skipping insertion in model container [2018-01-21 08:41:16,548 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,564 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:41:16,584 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:41:16,708 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:41:16,727 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:41:16,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16 WrapperNode [2018-01-21 08:41:16,752 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:41:16,752 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:41:16,752 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:41:16,752 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:41:16,763 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,763 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,772 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,772 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,779 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,781 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... [2018-01-21 08:41:16,783 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:41:16,783 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:41:16,783 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:41:16,784 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:41:16,785 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:41:16,831 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:41:16,831 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:41:16,831 INFO L136 BoogieDeclarations]: Found implementation of procedure bar [2018-01-21 08:41:16,831 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:41:16,831 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:41:16,831 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:41:16,831 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:41:16,831 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure bar [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:41:16,832 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:41:17,023 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:41:17,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:41:17 BoogieIcfgContainer [2018-01-21 08:41:17,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:41:17,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:41:17,024 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:41:17,027 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:41:17,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:41:16" (1/3) ... [2018-01-21 08:41:17,028 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47362b8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:41:17, skipping insertion in model container [2018-01-21 08:41:17,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:41:16" (2/3) ... [2018-01-21 08:41:17,029 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47362b8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:41:17, skipping insertion in model container [2018-01-21 08:41:17,029 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:41:17" (3/3) ... [2018-01-21 08:41:17,031 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength2_false-valid-deref-write.c [2018-01-21 08:41:17,037 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:41:17,043 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2018-01-21 08:41:17,086 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:17,087 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:17,087 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:17,087 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:17,087 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:17,087 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:17,088 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:17,088 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == barErr0EnsuresViolation======== [2018-01-21 08:41:17,089 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:17,110 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:41:17,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 08:41:17,116 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:17,117 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:17,117 INFO L371 AbstractCegarLoop]: === Iteration 1 === [barErr0EnsuresViolation]=== [2018-01-21 08:41:17,121 INFO L82 PathProgramCache]: Analyzing trace with hash -492377012, now seen corresponding path program 1 times [2018-01-21 08:41:17,123 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:17,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,163 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:17,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,163 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:17,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:17,224 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:17,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:17,270 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:17,270 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:41:17,270 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:17,272 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:41:17,283 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:41:17,284 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:17,285 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:41:17,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:17,308 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 08:41:17,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:41:17,309 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-21 08:41:17,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:17,314 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:41:17,315 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:41:17,318 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:17,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:41:17,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:41:17,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:41:17,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:41:17,340 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 20 [2018-01-21 08:41:17,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:17,340 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:41:17,341 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:41:17,341 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:41:17,341 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:41:17,346 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-01-21 08:41:17,450 INFO L404 ceAbstractionStarter]: At program point L13'''(lines 13 15) the Hoare annotation is: true [2018-01-21 08:41:17,450 INFO L401 ceAbstractionStarter]: For program point barErr0EnsuresViolation(lines 11 17) no Hoare annotation was computed. [2018-01-21 08:41:17,450 INFO L401 ceAbstractionStarter]: For program point L13''(lines 13 15) no Hoare annotation was computed. [2018-01-21 08:41:17,450 INFO L401 ceAbstractionStarter]: For program point L14(line 14) no Hoare annotation was computed. [2018-01-21 08:41:17,451 INFO L401 ceAbstractionStarter]: For program point L13(lines 13 15) no Hoare annotation was computed. [2018-01-21 08:41:17,451 INFO L404 ceAbstractionStarter]: At program point barENTRY(lines 11 17) the Hoare annotation is: true [2018-01-21 08:41:17,451 INFO L401 ceAbstractionStarter]: For program point L13''''(lines 13 15) no Hoare annotation was computed. [2018-01-21 08:41:17,451 INFO L401 ceAbstractionStarter]: For program point barFINAL(lines 11 17) no Hoare annotation was computed. [2018-01-21 08:41:17,451 INFO L401 ceAbstractionStarter]: For program point L14'(line 14) no Hoare annotation was computed. [2018-01-21 08:41:17,451 INFO L401 ceAbstractionStarter]: For program point barEXIT(lines 11 17) no Hoare annotation was computed. [2018-01-21 08:41:17,452 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initErr0EnsuresViolation(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:41:17,452 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:41:17,452 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.initENTRY(lines 1 43) the Hoare annotation is: true [2018-01-21 08:41:17,452 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initFINAL(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:41:17,452 INFO L401 ceAbstractionStarter]: For program point fooEXIT(lines 20 29) no Hoare annotation was computed. [2018-01-21 08:41:17,452 INFO L401 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-01-21 08:41:17,452 INFO L401 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-01-21 08:41:17,453 INFO L401 ceAbstractionStarter]: For program point L22(lines 22 24) no Hoare annotation was computed. [2018-01-21 08:41:17,453 INFO L401 ceAbstractionStarter]: For program point L25(line 25) no Hoare annotation was computed. [2018-01-21 08:41:17,453 INFO L401 ceAbstractionStarter]: For program point L23'(line 23) no Hoare annotation was computed. [2018-01-21 08:41:17,453 INFO L401 ceAbstractionStarter]: For program point L21'''''(line 21) no Hoare annotation was computed. [2018-01-21 08:41:17,453 INFO L401 ceAbstractionStarter]: For program point L25'(lines 25 27) no Hoare annotation was computed. [2018-01-21 08:41:17,453 INFO L401 ceAbstractionStarter]: For program point L21'''(line 21) no Hoare annotation was computed. [2018-01-21 08:41:17,454 INFO L401 ceAbstractionStarter]: For program point L21'(line 21) no Hoare annotation was computed. [2018-01-21 08:41:17,454 INFO L401 ceAbstractionStarter]: For program point fooFINAL(lines 20 29) no Hoare annotation was computed. [2018-01-21 08:41:17,454 INFO L404 ceAbstractionStarter]: At program point fooENTRY(lines 20 29) the Hoare annotation is: true [2018-01-21 08:41:17,454 INFO L401 ceAbstractionStarter]: For program point L22''(lines 22 24) no Hoare annotation was computed. [2018-01-21 08:41:17,454 INFO L401 ceAbstractionStarter]: For program point L23''(line 23) no Hoare annotation was computed. [2018-01-21 08:41:17,454 INFO L401 ceAbstractionStarter]: For program point L21''(line 21) no Hoare annotation was computed. [2018-01-21 08:41:17,454 INFO L404 ceAbstractionStarter]: At program point L22''''(lines 22 24) the Hoare annotation is: true [2018-01-21 08:41:17,455 INFO L404 ceAbstractionStarter]: At program point L22'''(lines 22 24) the Hoare annotation is: true [2018-01-21 08:41:17,455 INFO L401 ceAbstractionStarter]: For program point fooErr0EnsuresViolation(lines 20 29) no Hoare annotation was computed. [2018-01-21 08:41:17,455 INFO L401 ceAbstractionStarter]: For program point L21''''(line 21) no Hoare annotation was computed. [2018-01-21 08:41:17,455 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(lines 1 43) the Hoare annotation is: true [2018-01-21 08:41:17,455 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:41:17,455 INFO L404 ceAbstractionStarter]: At program point L1(lines 1 43) the Hoare annotation is: true [2018-01-21 08:41:17,456 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startErr0EnsuresViolation(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:41:17,456 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(lines 1 43) no Hoare annotation was computed. [2018-01-21 08:41:17,456 INFO L404 ceAbstractionStarter]: At program point L36''(lines 36 40) the Hoare annotation is: true [2018-01-21 08:41:17,456 INFO L401 ceAbstractionStarter]: For program point L33''(lines 33 35) no Hoare annotation was computed. [2018-01-21 08:41:17,456 INFO L401 ceAbstractionStarter]: For program point L34''(line 34) no Hoare annotation was computed. [2018-01-21 08:41:17,456 INFO L404 ceAbstractionStarter]: At program point L33'''(lines 33 35) the Hoare annotation is: true [2018-01-21 08:41:17,456 INFO L401 ceAbstractionStarter]: For program point L32''(line 32) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point L37'(line 37) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point L32''''(line 32) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point L32'''''(line 32) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point mainErr0EnsuresViolation(lines 31 42) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point L36'''(lines 36 40) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point mainFINAL(lines 31 42) no Hoare annotation was computed. [2018-01-21 08:41:17,457 INFO L401 ceAbstractionStarter]: For program point L32(line 32) no Hoare annotation was computed. [2018-01-21 08:41:17,458 INFO L401 ceAbstractionStarter]: For program point L32'''(line 32) no Hoare annotation was computed. [2018-01-21 08:41:17,458 INFO L404 ceAbstractionStarter]: At program point L34(line 34) the Hoare annotation is: true [2018-01-21 08:41:17,458 INFO L401 ceAbstractionStarter]: For program point L33(lines 33 35) no Hoare annotation was computed. [2018-01-21 08:41:17,458 INFO L401 ceAbstractionStarter]: For program point L34'''(line 34) no Hoare annotation was computed. [2018-01-21 08:41:17,458 INFO L401 ceAbstractionStarter]: For program point L33''''(lines 33 35) no Hoare annotation was computed. [2018-01-21 08:41:17,458 INFO L401 ceAbstractionStarter]: For program point L36(lines 36 40) no Hoare annotation was computed. [2018-01-21 08:41:17,459 INFO L401 ceAbstractionStarter]: For program point mainEXIT(lines 31 42) no Hoare annotation was computed. [2018-01-21 08:41:17,459 INFO L404 ceAbstractionStarter]: At program point mainENTRY(lines 31 42) the Hoare annotation is: true [2018-01-21 08:41:17,459 INFO L401 ceAbstractionStarter]: For program point L38(line 38) no Hoare annotation was computed. [2018-01-21 08:41:17,459 INFO L401 ceAbstractionStarter]: For program point L37(line 37) no Hoare annotation was computed. [2018-01-21 08:41:17,459 INFO L401 ceAbstractionStarter]: For program point L34'(line 34) no Hoare annotation was computed. [2018-01-21 08:41:17,459 INFO L401 ceAbstractionStarter]: For program point L32'(line 32) no Hoare annotation was computed. [2018-01-21 08:41:17,463 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:17,463 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:17,464 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:17,464 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:17,464 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:17,464 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:17,464 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:17,464 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:41:17,464 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:17,467 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:41:17,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:41:17,467 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:17,467 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:41:17,467 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:41:17,468 INFO L82 PathProgramCache]: Analyzing trace with hash 136143, now seen corresponding path program 1 times [2018-01-21 08:41:17,468 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:17,469 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,469 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:17,469 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,470 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:17,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:41:17,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:41:17,500 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:41:17,505 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:41:17,509 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:17,510 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:17,510 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:17,510 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:17,510 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:17,510 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:17,510 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:17,510 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:41:17,510 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:17,512 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:41:17,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 08:41:17,513 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:17,513 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:17,513 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:41:17,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1220349549, now seen corresponding path program 1 times [2018-01-21 08:41:17,513 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:17,514 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,514 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:17,514 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,514 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:17,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:17,531 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:17,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:17,558 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:17,558 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:41:17,558 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:17,559 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:41:17,559 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:41:17,559 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:17,559 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:41:17,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:17,568 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 08:41:17,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:41:17,568 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 26 [2018-01-21 08:41:17,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:17,571 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:41:17,571 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 08:41:17,572 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:17,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 08:41:17,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 08:41:17,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 08:41:17,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 08:41:17,584 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 26 [2018-01-21 08:41:17,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:17,584 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 08:41:17,584 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:41:17,585 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 08:41:17,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 08:41:17,586 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:17,586 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:17,586 INFO L371 AbstractCegarLoop]: === Iteration 2 === [fooErr0EnsuresViolation]=== [2018-01-21 08:41:17,586 INFO L82 PathProgramCache]: Analyzing trace with hash 390316661, now seen corresponding path program 1 times [2018-01-21 08:41:17,587 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:17,588 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,588 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:17,588 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,588 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:17,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:17,618 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:17,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:17,736 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:17,736 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-01-21 08:41:17,736 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:17,738 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 08:41:17,739 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 08:41:17,739 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:41:17,739 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 7 states. [2018-01-21 08:41:17,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:17,895 INFO L93 Difference]: Finished difference Result 112 states and 124 transitions. [2018-01-21 08:41:17,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 08:41:17,896 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2018-01-21 08:41:17,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:17,900 INFO L225 Difference]: With dead ends: 112 [2018-01-21 08:41:17,901 INFO L226 Difference]: Without dead ends: 77 [2018-01-21 08:41:17,902 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:41:17,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-01-21 08:41:17,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 69. [2018-01-21 08:41:17,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-01-21 08:41:17,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 77 transitions. [2018-01-21 08:41:17,920 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 77 transitions. Word has length 28 [2018-01-21 08:41:17,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:17,921 INFO L432 AbstractCegarLoop]: Abstraction has 69 states and 77 transitions. [2018-01-21 08:41:17,921 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 08:41:17,921 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 77 transitions. [2018-01-21 08:41:17,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 08:41:17,923 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:17,923 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, 1, 1] [2018-01-21 08:41:17,923 INFO L371 AbstractCegarLoop]: === Iteration 3 === [fooErr0EnsuresViolation]=== [2018-01-21 08:41:17,924 INFO L82 PathProgramCache]: Analyzing trace with hash 2078164222, now seen corresponding path program 1 times [2018-01-21 08:41:17,924 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:17,925 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,925 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:17,925 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:17,925 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:17,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:17,943 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:18,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:18,017 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:18,017 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 08:41:18,017 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:18,018 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:41:18,018 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:41:18,018 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 08:41:18,018 INFO L87 Difference]: Start difference. First operand 69 states and 77 transitions. Second operand 6 states. [2018-01-21 08:41:18,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:18,136 INFO L93 Difference]: Finished difference Result 129 states and 144 transitions. [2018-01-21 08:41:18,137 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:41:18,137 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2018-01-21 08:41:18,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:18,138 INFO L225 Difference]: With dead ends: 129 [2018-01-21 08:41:18,139 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 08:41:18,139 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-01-21 08:41:18,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 08:41:18,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2018-01-21 08:41:18,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-01-21 08:41:18,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 79 transitions. [2018-01-21 08:41:18,147 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 79 transitions. Word has length 33 [2018-01-21 08:41:18,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:18,147 INFO L432 AbstractCegarLoop]: Abstraction has 71 states and 79 transitions. [2018-01-21 08:41:18,147 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:41:18,147 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 79 transitions. [2018-01-21 08:41:18,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 08:41:18,148 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:18,148 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:18,148 INFO L371 AbstractCegarLoop]: === Iteration 4 === [fooErr0EnsuresViolation]=== [2018-01-21 08:41:18,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1168283626, now seen corresponding path program 1 times [2018-01-21 08:41:18,148 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:18,149 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,149 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:18,149 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,149 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:18,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:18,171 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:18,251 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:41:18,252 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:18,252 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:41:18,252 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:18,253 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 08:41:18,253 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 08:41:18,253 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 08:41:18,253 INFO L87 Difference]: Start difference. First operand 71 states and 79 transitions. Second operand 4 states. [2018-01-21 08:41:18,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:18,320 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2018-01-21 08:41:18,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:41:18,320 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 39 [2018-01-21 08:41:18,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:18,321 INFO L225 Difference]: With dead ends: 71 [2018-01-21 08:41:18,321 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:41:18,321 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:41:18,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:41:18,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:41:18,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:41:18,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:41:18,322 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 39 [2018-01-21 08:41:18,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:18,322 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:41:18,322 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 08:41:18,322 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:41:18,323 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:41:18,324 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:41:18,324 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:41:18,325 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:41:18,325 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:41:18,325 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:41:18,325 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:41:18,325 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:41:18,325 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:41:18,325 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:41:18,326 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 08:41:18,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:41:18,327 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:18,327 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:18,327 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:18,327 INFO L82 PathProgramCache]: Analyzing trace with hash -851979775, now seen corresponding path program 1 times [2018-01-21 08:41:18,328 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:18,328 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,328 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:18,328 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,329 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:18,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:18,334 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:18,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:18,340 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:18,340 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:41:18,341 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:18,341 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:41:18,341 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:41:18,341 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:18,342 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 08:41:18,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:18,348 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 08:41:18,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:41:18,348 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:41:18,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:18,349 INFO L225 Difference]: With dead ends: 114 [2018-01-21 08:41:18,349 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 08:41:18,350 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:41:18,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 08:41:18,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-01-21 08:41:18,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 08:41:18,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 08:41:18,356 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 17 [2018-01-21 08:41:18,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:18,357 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 08:41:18,357 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:41:18,357 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 08:41:18,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:41:18,358 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:18,358 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:18,358 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:18,358 INFO L82 PathProgramCache]: Analyzing trace with hash -178858898, now seen corresponding path program 1 times [2018-01-21 08:41:18,359 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:18,360 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,360 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:18,360 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,360 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:18,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:18,366 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:18,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:18,380 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:41:18,380 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:41:18,380 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:18,381 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:41:18,381 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:41:18,381 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:41:18,382 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 3 states. [2018-01-21 08:41:18,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:18,400 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2018-01-21 08:41:18,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:41:18,400 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:41:18,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:18,402 INFO L225 Difference]: With dead ends: 76 [2018-01-21 08:41:18,402 INFO L226 Difference]: Without dead ends: 61 [2018-01-21 08:41:18,402 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:41:18,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-01-21 08:41:18,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 56. [2018-01-21 08:41:18,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 08:41:18,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2018-01-21 08:41:18,408 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 19 [2018-01-21 08:41:18,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:18,408 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2018-01-21 08:41:18,408 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:41:18,408 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2018-01-21 08:41:18,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 08:41:18,410 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:18,410 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:18,410 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:18,410 INFO L82 PathProgramCache]: Analyzing trace with hash -853032378, now seen corresponding path program 1 times [2018-01-21 08:41:18,411 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:18,411 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,412 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:18,412 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:18,412 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:18,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:18,428 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:18,459 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:18,460 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:18,460 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:18,461 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 47 with the following transitions: [2018-01-21 08:41:18,463 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [17], [18], [20], [21], [23], [24], [25], [29], [32], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 08:41:18,527 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:41:18,528 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:41:22,366 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:41:22,368 INFO L268 AbstractInterpreter]: Visited 45 different actions 81 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 23 variables. [2018-01-21 08:41:22,398 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:41:22,398 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:22,399 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:22,411 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:22,411 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:41:22,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:22,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:22,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:22,514 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:22,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:41:22,760 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:41:22,760 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [4] total 10 [2018-01-21 08:41:22,760 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:22,762 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 08:41:22,762 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 08:41:22,762 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2018-01-21 08:41:22,763 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 6 states. [2018-01-21 08:41:22,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:22,846 INFO L93 Difference]: Finished difference Result 117 states and 128 transitions. [2018-01-21 08:41:22,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:41:22,847 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 46 [2018-01-21 08:41:22,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:22,848 INFO L225 Difference]: With dead ends: 117 [2018-01-21 08:41:22,848 INFO L226 Difference]: Without dead ends: 62 [2018-01-21 08:41:22,849 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 84 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:41:22,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-01-21 08:41:22,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2018-01-21 08:41:22,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 08:41:22,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2018-01-21 08:41:22,855 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 46 [2018-01-21 08:41:22,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:22,855 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2018-01-21 08:41:22,855 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 08:41:22,855 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2018-01-21 08:41:22,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 08:41:22,857 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:22,857 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:22,857 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:22,858 INFO L82 PathProgramCache]: Analyzing trace with hash -731617746, now seen corresponding path program 1 times [2018-01-21 08:41:22,858 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:22,859 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:22,859 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:22,859 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:22,859 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:22,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:22,876 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:22,933 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:22,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:22,934 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:22,934 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 53 with the following transitions: [2018-01-21 08:41:22,934 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [17], [18], [20], [21], [23], [24], [25], [29], [32], [34], [35], [36], [37], [39], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 08:41:22,936 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:41:22,937 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:41:43,972 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:41:43,972 INFO L268 AbstractInterpreter]: Visited 50 different actions 150 times. Merged at 30 different actions 55 times. Never widened. Found 7 fixpoints after 5 different actions. Largest state had 25 variables. [2018-01-21 08:41:43,991 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:41:43,991 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:43,992 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:41:43,999 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:43,999 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:41:44,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:44,033 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:41:44,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:44,111 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:41:44,356 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:41:44,377 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:41:44,377 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [4] total 11 [2018-01-21 08:41:44,377 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:41:44,377 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 08:41:44,378 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 08:41:44,378 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:41:44,378 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand 7 states. [2018-01-21 08:41:44,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:41:44,513 INFO L93 Difference]: Finished difference Result 122 states and 132 transitions. [2018-01-21 08:41:44,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 08:41:44,514 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 52 [2018-01-21 08:41:44,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:41:44,515 INFO L225 Difference]: With dead ends: 122 [2018-01-21 08:41:44,515 INFO L226 Difference]: Without dead ends: 63 [2018-01-21 08:41:44,516 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 93 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2018-01-21 08:41:44,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-21 08:41:44,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2018-01-21 08:41:44,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-01-21 08:41:44,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-01-21 08:41:44,523 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 52 [2018-01-21 08:41:44,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:41:44,523 INFO L432 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-01-21 08:41:44,524 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 08:41:44,524 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-01-21 08:41:44,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 08:41:44,525 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:41:44,525 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:41:44,525 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:41:44,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1697227175, now seen corresponding path program 1 times [2018-01-21 08:41:44,526 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:41:44,527 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,527 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:41:44,527 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:41:44,527 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:41:44,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:41:44,543 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:41:44,588 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:41:44,588 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:41:44,588 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:41:44,588 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 58 with the following transitions: [2018-01-21 08:41:44,589 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [9], [10], [11], [13], [17], [18], [20], [21], [23], [24], [25], [29], [32], [34], [35], [36], [37], [39], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 08:41:44,591 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:41:44,591 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:42:06,390 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:42:06,390 INFO L268 AbstractInterpreter]: Visited 54 different actions 223 times. Merged at 38 different actions 103 times. Never widened. Found 17 fixpoints after 7 different actions. Largest state had 25 variables. [2018-01-21 08:42:06,394 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:42:06,394 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:06,394 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:06,399 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:06,399 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:42:06,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:06,417 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:06,427 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:42:06,427 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:06,457 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:42:06,476 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:06,476 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:06,480 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:06,480 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:42:06,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:06,522 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:06,529 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:42:06,529 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:06,603 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 08:42:06,604 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:06,604 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 08:42:06,604 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:06,605 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:42:06,605 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:42:06,605 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:42:06,605 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 5 states. [2018-01-21 08:42:06,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:06,629 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2018-01-21 08:42:06,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:42:06,630 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 57 [2018-01-21 08:42:06,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:06,631 INFO L225 Difference]: With dead ends: 84 [2018-01-21 08:42:06,631 INFO L226 Difference]: Without dead ends: 72 [2018-01-21 08:42:06,632 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 08:42:06,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-01-21 08:42:06,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 67. [2018-01-21 08:42:06,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 08:42:06,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-21 08:42:06,638 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 57 [2018-01-21 08:42:06,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:06,638 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-21 08:42:06,639 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:42:06,639 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-21 08:42:06,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-21 08:42:06,640 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:06,641 INFO L322 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:06,641 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:06,641 INFO L82 PathProgramCache]: Analyzing trace with hash -1018648941, now seen corresponding path program 2 times [2018-01-21 08:42:06,641 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:06,642 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:06,642 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:42:06,642 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:06,642 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:06,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:06,664 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:06,746 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-01-21 08:42:06,747 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:06,747 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:06,747 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:06,747 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:06,747 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:06,747 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:06,758 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:42:06,758 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:06,773 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:06,793 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:06,796 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:06,801 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:06,867 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 32 proven. 2 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-01-21 08:42:06,867 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:06,995 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 32 proven. 2 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-01-21 08:42:07,016 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:07,016 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:07,021 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:42:07,021 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:07,041 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:07,070 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:07,087 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:07,093 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:07,120 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-01-21 08:42:07,120 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:07,186 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-01-21 08:42:07,188 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:07,188 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8, 5, 5] total 18 [2018-01-21 08:42:07,188 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:07,189 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 08:42:07,189 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 08:42:07,189 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:42:07,189 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 11 states. [2018-01-21 08:42:07,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:07,352 INFO L93 Difference]: Finished difference Result 178 states and 199 transitions. [2018-01-21 08:42:07,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 08:42:07,352 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 93 [2018-01-21 08:42:07,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:07,354 INFO L225 Difference]: With dead ends: 178 [2018-01-21 08:42:07,354 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 08:42:07,355 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 357 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2018-01-21 08:42:07,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 08:42:07,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 100. [2018-01-21 08:42:07,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-01-21 08:42:07,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 109 transitions. [2018-01-21 08:42:07,370 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 109 transitions. Word has length 93 [2018-01-21 08:42:07,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:07,371 INFO L432 AbstractCegarLoop]: Abstraction has 100 states and 109 transitions. [2018-01-21 08:42:07,371 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 08:42:07,371 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 109 transitions. [2018-01-21 08:42:07,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-01-21 08:42:07,373 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:07,373 INFO L322 BasicCegarLoop]: trace histogram [8, 6, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:42:07,373 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:07,373 INFO L82 PathProgramCache]: Analyzing trace with hash 737188527, now seen corresponding path program 3 times [2018-01-21 08:42:07,374 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:07,374 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:07,375 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:07,375 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:07,375 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:07,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:07,398 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:07,461 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2018-01-21 08:42:07,461 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:07,461 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:07,461 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:07,461 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:07,461 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:07,461 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:07,466 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:42:07,467 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:42:07,481 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:07,487 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:07,494 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:07,495 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:07,498 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:07,547 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 114 proven. 2 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-01-21 08:42:07,547 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:07,755 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 114 proven. 2 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-01-21 08:42:07,775 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:07,775 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:07,778 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:42:07,778 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:42:07,795 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:07,807 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:07,832 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:42:07,847 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:07,852 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:07,873 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 114 proven. 2 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-01-21 08:42:07,873 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:08,047 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 114 proven. 2 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2018-01-21 08:42:08,049 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:08,049 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 18 [2018-01-21 08:42:08,049 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:08,050 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 08:42:08,050 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 08:42:08,050 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:42:08,050 INFO L87 Difference]: Start difference. First operand 100 states and 109 transitions. Second operand 12 states. [2018-01-21 08:42:08,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:08,194 INFO L93 Difference]: Finished difference Result 171 states and 195 transitions. [2018-01-21 08:42:08,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 08:42:08,194 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 141 [2018-01-21 08:42:08,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:08,195 INFO L225 Difference]: With dead ends: 171 [2018-01-21 08:42:08,196 INFO L226 Difference]: Without dead ends: 150 [2018-01-21 08:42:08,196 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 547 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:42:08,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-01-21 08:42:08,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 123. [2018-01-21 08:42:08,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-01-21 08:42:08,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 137 transitions. [2018-01-21 08:42:08,207 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 137 transitions. Word has length 141 [2018-01-21 08:42:08,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:08,207 INFO L432 AbstractCegarLoop]: Abstraction has 123 states and 137 transitions. [2018-01-21 08:42:08,208 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 08:42:08,208 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 137 transitions. [2018-01-21 08:42:08,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-01-21 08:42:08,210 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:08,210 INFO L322 BasicCegarLoop]: trace histogram [11, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1] [2018-01-21 08:42:08,211 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:08,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1663187030, now seen corresponding path program 4 times [2018-01-21 08:42:08,211 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:08,212 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:08,212 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:08,212 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:08,212 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:08,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:08,246 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:08,375 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 451 trivial. 0 not checked. [2018-01-21 08:42:08,375 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:08,376 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:08,376 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:08,376 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:08,376 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:08,376 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:08,401 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:42:08,401 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:42:08,449 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:08,453 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:08,517 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 324 proven. 10 refuted. 0 times theorem prover too weak. 167 trivial. 0 not checked. [2018-01-21 08:42:08,517 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:08,674 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 116 proven. 53 refuted. 0 times theorem prover too weak. 332 trivial. 0 not checked. [2018-01-21 08:42:08,693 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:08,694 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:08,696 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:42:08,696 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:42:08,778 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:08,785 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:08,807 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 324 proven. 10 refuted. 0 times theorem prover too weak. 167 trivial. 0 not checked. [2018-01-21 08:42:08,807 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:08,951 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 116 proven. 53 refuted. 0 times theorem prover too weak. 332 trivial. 0 not checked. [2018-01-21 08:42:08,953 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:08,953 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10, 10, 10] total 19 [2018-01-21 08:42:08,953 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:08,953 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 08:42:08,954 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 08:42:08,954 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:42:08,954 INFO L87 Difference]: Start difference. First operand 123 states and 137 transitions. Second operand 15 states. [2018-01-21 08:42:09,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:09,179 INFO L93 Difference]: Finished difference Result 405 states and 487 transitions. [2018-01-21 08:42:09,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:42:09,179 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 198 [2018-01-21 08:42:09,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:09,181 INFO L225 Difference]: With dead ends: 405 [2018-01-21 08:42:09,181 INFO L226 Difference]: Without dead ends: 313 [2018-01-21 08:42:09,182 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 808 GetRequests, 773 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:42:09,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2018-01-21 08:42:09,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 162. [2018-01-21 08:42:09,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-21 08:42:09,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2018-01-21 08:42:09,196 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 198 [2018-01-21 08:42:09,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:09,197 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2018-01-21 08:42:09,197 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 08:42:09,197 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2018-01-21 08:42:09,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-01-21 08:42:09,199 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:09,199 INFO L322 BasicCegarLoop]: trace histogram [17, 13, 12, 12, 12, 12, 12, 8, 8, 8, 8, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 1] [2018-01-21 08:42:09,199 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:09,200 INFO L82 PathProgramCache]: Analyzing trace with hash 601612238, now seen corresponding path program 5 times [2018-01-21 08:42:09,200 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:09,200 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:09,200 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:09,200 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:09,200 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:09,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:09,230 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:09,346 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 916 trivial. 0 not checked. [2018-01-21 08:42:09,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:09,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:09,347 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:09,347 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:09,347 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:09,347 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:09,352 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:42:09,352 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:09,368 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:09,376 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:09,387 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:09,389 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:09,393 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:09,449 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 483 proven. 10 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2018-01-21 08:42:09,449 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:09,606 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 81 proven. 238 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2018-01-21 08:42:09,627 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:09,627 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:09,629 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:42:09,629 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:42:09,654 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:09,674 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:11,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:42:11,237 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:11,245 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:11,274 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 483 proven. 10 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2018-01-21 08:42:11,274 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:11,405 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 81 proven. 238 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2018-01-21 08:42:11,406 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:42:11,407 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 16 [2018-01-21 08:42:11,407 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:42:11,407 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 08:42:11,407 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 08:42:11,407 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2018-01-21 08:42:11,408 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand 14 states. [2018-01-21 08:42:11,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:42:11,566 INFO L93 Difference]: Finished difference Result 323 states and 368 transitions. [2018-01-21 08:42:11,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:42:11,566 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 258 [2018-01-21 08:42:11,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:42:11,567 INFO L225 Difference]: With dead ends: 323 [2018-01-21 08:42:11,567 INFO L226 Difference]: Without dead ends: 184 [2018-01-21 08:42:11,568 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1041 GetRequests, 1015 SyntacticMatches, 10 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:42:11,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-01-21 08:42:11,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 168. [2018-01-21 08:42:11,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-01-21 08:42:11,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 185 transitions. [2018-01-21 08:42:11,579 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 185 transitions. Word has length 258 [2018-01-21 08:42:11,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:42:11,579 INFO L432 AbstractCegarLoop]: Abstraction has 168 states and 185 transitions. [2018-01-21 08:42:11,579 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 08:42:11,579 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 185 transitions. [2018-01-21 08:42:11,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-01-21 08:42:11,582 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:42:11,582 INFO L322 BasicCegarLoop]: trace histogram [21, 17, 15, 15, 15, 15, 15, 11, 11, 11, 11, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 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, 1] [2018-01-21 08:42:11,582 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:42:11,583 INFO L82 PathProgramCache]: Analyzing trace with hash -969187446, now seen corresponding path program 6 times [2018-01-21 08:42:11,583 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:42:11,583 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:11,583 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:42:11,584 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:42:11,584 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:42:11,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:42:11,616 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:42:11,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1604 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1487 trivial. 0 not checked. [2018-01-21 08:42:11,937 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:11,937 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:42:11,937 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:42:11,937 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:42:11,937 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:11,938 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:42:11,948 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:42:11,948 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:42:11,974 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:11,990 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,001 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,022 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,037 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,153 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,292 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,295 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:42:12,300 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:42:12,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1604 backedges. 510 proven. 9 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 08:42:12,405 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:42:12,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1604 backedges. 510 proven. 9 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 08:42:12,698 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:42:12,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:42:12,701 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:42:12,701 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:42:12,727 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,737 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,764 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:42:12,809 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