java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:38:00,276 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:38:00,286 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:38:00,303 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:38:00,303 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:38:00,304 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:38:00,305 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:38:00,307 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:38:00,309 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:38:00,310 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:38:00,311 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:38:00,311 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:38:00,312 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:38:00,313 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:38:00,314 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:38:00,315 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:38:00,315 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:38:00,317 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:38:00,319 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:38:00,321 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:38:00,322 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:38:00,323 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:38:00,326 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:38:00,326 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:38:00,326 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:38:00,327 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:38:00,328 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:38:00,329 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:38:00,329 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:38:00,331 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:38:00,331 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:38:00,332 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:38:00,334 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:38:00,350 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:38:00,351 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:38:00,354 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:38:00,355 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:38:00,355 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:38:00,355 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:38:00,355 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:38:00,355 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:38:00,356 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:38:00,356 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:38:00,356 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:38:00,356 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:38:00,356 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:38:00,357 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:38:00,358 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:38:00,358 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:38:00,358 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:38:00,358 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:38:00,358 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:38:00,359 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:38:00,359 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:38:00,359 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:38:00,359 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:38:00,359 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:38:00,360 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:38:00,360 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:38:00,360 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:38:00,360 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:38:00,361 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:38:00,361 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:38:00,361 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:38:00,361 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:38:00,361 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:38:00,362 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:38:00,362 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:38:00,362 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:38:00,404 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:38:00,418 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:38:00,423 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:38:00,424 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:38:00,425 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:38:00,426 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-24 12:38:00,489 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a4cb87df0/e5313a134f9b4c249e14d2b6a80262b1/FLAG326449342 [2018-10-24 12:38:00,914 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:38:00,914 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-24 12:38:00,919 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a4cb87df0/e5313a134f9b4c249e14d2b6a80262b1/FLAG326449342 [2018-10-24 12:38:00,934 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/a4cb87df0/e5313a134f9b4c249e14d2b6a80262b1 [2018-10-24 12:38:00,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:38:00,946 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:38:00,947 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:38:00,947 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:38:00,953 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:38:00,954 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,958 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2597fac7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00, skipping insertion in model container [2018-10-24 12:38:00,958 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,968 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:38:00,985 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:38:01,204 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:38:01,208 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:38:01,229 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:38:01,248 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:38:01,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01 WrapperNode [2018-10-24 12:38:01,249 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:38:01,250 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:38:01,250 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:38:01,250 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:38:01,260 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,266 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,273 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:38:01,273 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:38:01,273 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:38:01,273 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:38:01,287 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,288 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,288 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,289 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,293 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,301 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,302 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... [2018-10-24 12:38:01,304 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:38:01,304 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:38:01,304 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:38:01,305 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:38:01,305 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:01,431 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:38:01,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:38:01,431 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:38:01,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:38:01,432 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:38:01,432 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:38:01,432 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:38:01,432 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:38:01,658 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:38:01,658 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:38:01 BoogieIcfgContainer [2018-10-24 12:38:01,658 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:38:01,660 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:38:01,661 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:38:01,665 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:38:01,665 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:38:00" (1/3) ... [2018-10-24 12:38:01,666 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f3c4c74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:38:01, skipping insertion in model container [2018-10-24 12:38:01,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:01" (2/3) ... [2018-10-24 12:38:01,667 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f3c4c74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:38:01, skipping insertion in model container [2018-10-24 12:38:01,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:38:01" (3/3) ... [2018-10-24 12:38:01,669 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_nondet_true-unreach-call_true-termination.i [2018-10-24 12:38:01,683 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:38:01,705 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:38:01,724 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:38:01,762 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:38:01,762 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:38:01,762 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:38:01,762 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:38:01,763 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:38:01,766 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:38:01,766 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:38:01,766 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:38:01,785 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-24 12:38:01,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:38:01,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:01,793 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:01,795 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:01,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:01,801 INFO L82 PathProgramCache]: Analyzing trace with hash -722424895, now seen corresponding path program 1 times [2018-10-24 12:38:01,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:01,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:01,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,858 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:01,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:01,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:01,910 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:01,910 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:38:01,911 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:01,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:38:01,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:38:01,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:38:01,931 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-24 12:38:01,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:01,956 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-24 12:38:01,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:38:01,960 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:38:01,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:01,970 INFO L225 Difference]: With dead ends: 32 [2018-10-24 12:38:01,970 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:38:01,974 INFO L605 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 [2018-10-24 12:38:01,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:38:02,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:38:02,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:38:02,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-24 12:38:02,008 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-24 12:38:02,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:02,008 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-24 12:38:02,008 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:38:02,009 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-24 12:38:02,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:38:02,009 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:02,010 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:02,010 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:02,010 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1289299715, now seen corresponding path program 1 times [2018-10-24 12:38:02,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:02,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:02,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:02,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,086 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:02,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:38:02,087 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:02,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:38:02,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:38:02,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:38:02,089 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-24 12:38:02,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:02,122 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:38:02,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:38:02,123 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:38:02,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:02,124 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:38:02,124 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:38:02,125 INFO L605 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 [2018-10-24 12:38:02,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:38:02,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-24 12:38:02,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:38:02,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-24 12:38:02,129 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-24 12:38:02,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:02,130 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-24 12:38:02,130 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:38:02,130 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-24 12:38:02,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:38:02,130 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:02,131 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:02,131 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:02,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1003978365, now seen corresponding path program 1 times [2018-10-24 12:38:02,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:02,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:02,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,133 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:02,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:02,205 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:38:02,207 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [25], [28], [30], [36], [37], [38], [40] [2018-10-24 12:38:02,242 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:02,242 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:02,406 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:02,407 INFO L272 AbstractInterpreter]: Visited 13 different actions 25 times. Merged at 4 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-24 12:38:02,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,428 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:02,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,428 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:02,439 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:02,440 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:02,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:02,490 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:02,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,565 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:02,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2018-10-24 12:38:02,565 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:02,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:38:02,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:38:02,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:38:02,567 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-24 12:38:02,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:02,634 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-24 12:38:02,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:38:02,634 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:38:02,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:02,635 INFO L225 Difference]: With dead ends: 23 [2018-10-24 12:38:02,636 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:38:02,636 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-24 12:38:02,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:38:02,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:38:02,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:38:02,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 12:38:02,641 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-24 12:38:02,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:02,642 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 12:38:02,643 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:38:02,643 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 12:38:02,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:38:02,644 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:02,644 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:02,644 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:02,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,645 INFO L82 PathProgramCache]: Analyzing trace with hash 6482173, now seen corresponding path program 2 times [2018-10-24 12:38:02,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:02,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,646 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:02,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,648 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:02,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,792 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:02,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:02,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:02,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:02,801 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:02,801 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:02,844 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:38:02,844 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:02,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:02,958 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:02,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:03,214 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:03,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:38:03,236 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:03,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:38:03,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:38:03,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:38:03,238 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2018-10-24 12:38:03,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:03,314 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:38:03,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:38:03,315 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2018-10-24 12:38:03,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:03,315 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:38:03,316 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:38:03,316 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:38:03,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:38:03,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-24 12:38:03,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:38:03,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-24 12:38:03,322 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-24 12:38:03,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:03,323 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-24 12:38:03,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:38:03,323 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-24 12:38:03,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:38:03,324 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:03,324 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:03,324 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:03,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:03,325 INFO L82 PathProgramCache]: Analyzing trace with hash 476147325, now seen corresponding path program 3 times [2018-10-24 12:38:03,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:03,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:03,326 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:03,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:03,326 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:03,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:03,560 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:03,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:03,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:03,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:03,569 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:03,569 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:03,592 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:03,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:03,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:03,642 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,642 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:03,887 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:03,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:03,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:38:03,908 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:03,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:38:03,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:38:03,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:38:03,909 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2018-10-24 12:38:04,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:04,136 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 12:38:04,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:38:04,139 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-24 12:38:04,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:04,140 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:38:04,140 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:38:04,143 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:38:04,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:38:04,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-24 12:38:04,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:38:04,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 12:38:04,152 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-24 12:38:04,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:04,154 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 12:38:04,154 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:38:04,154 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 12:38:04,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:38:04,155 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:04,155 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:04,156 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:04,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:04,156 INFO L82 PathProgramCache]: Analyzing trace with hash -732759811, now seen corresponding path program 4 times [2018-10-24 12:38:04,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:04,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:04,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,163 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:04,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:04,321 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:04,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:04,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:04,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:04,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:04,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:04,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:04,338 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:04,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:04,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:04,368 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:04,541 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:04,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:38:04,562 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:04,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:38:04,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:38:04,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:38:04,564 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-24 12:38:04,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:04,624 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:38:04,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:38:04,625 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-24 12:38:04,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:04,626 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:38:04,626 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 12:38:04,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:38:04,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 12:38:04,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-24 12:38:04,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:38:04,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-24 12:38:04,632 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-24 12:38:04,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:04,633 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-24 12:38:04,633 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:38:04,633 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-24 12:38:04,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:38:04,634 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:04,634 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:04,634 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:04,635 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:04,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1984471427, now seen corresponding path program 5 times [2018-10-24 12:38:04,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:04,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:04,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,636 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:04,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:04,810 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:04,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:04,811 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:04,811 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:04,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:04,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:04,811 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:04,820 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:04,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:04,916 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:38:04,916 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:04,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:05,015 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:05,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:05,298 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:05,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:05,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:38:05,329 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:05,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:38:05,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:38:05,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:38:05,330 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 10 states. [2018-10-24 12:38:05,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:05,384 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 12:38:05,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:38:05,384 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-24 12:38:05,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:05,386 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:38:05,386 INFO L226 Difference]: Without dead ends: 31 [2018-10-24 12:38:05,387 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:38:05,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-24 12:38:05,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-24 12:38:05,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:38:05,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 12:38:05,393 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-24 12:38:05,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:05,393 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 12:38:05,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:38:05,393 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 12:38:05,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:38:05,394 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:05,394 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:05,395 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:05,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:05,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1475807485, now seen corresponding path program 6 times [2018-10-24 12:38:05,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:05,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:05,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:05,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:05,396 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:05,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:05,544 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:05,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:05,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:05,545 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:05,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:05,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:05,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:05,555 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:05,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:05,595 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:05,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:05,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:05,640 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:05,641 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:05,818 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:05,840 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:05,840 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:38:05,840 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:05,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:38:05,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:38:05,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:38:05,841 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 11 states. [2018-10-24 12:38:05,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:05,923 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:38:05,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:38:05,924 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-24 12:38:05,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:05,925 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:38:05,925 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:38:05,925 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:38:05,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:38:05,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-24 12:38:05,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:38:05,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-24 12:38:05,931 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-24 12:38:05,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:05,931 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-24 12:38:05,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:38:05,931 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-24 12:38:05,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:38:05,932 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:05,932 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:05,933 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:05,933 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:05,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1160163715, now seen corresponding path program 7 times [2018-10-24 12:38:05,933 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:05,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:05,934 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:05,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:05,934 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:05,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:06,141 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:06,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:06,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:06,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:06,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:06,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:06,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:06,150 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:06,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:06,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:06,202 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:06,402 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:06,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:38:06,424 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:06,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:38:06,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:38:06,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=299, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:38:06,426 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 12 states. [2018-10-24 12:38:06,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:06,596 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:38:06,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:38:06,597 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2018-10-24 12:38:06,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:06,598 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:38:06,598 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:38:06,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:38:06,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:38:06,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-24 12:38:06,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:38:06,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 12:38:06,603 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-24 12:38:06,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:06,603 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 12:38:06,603 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:38:06,603 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 12:38:06,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:38:06,604 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:06,604 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:06,605 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:06,605 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:06,605 INFO L82 PathProgramCache]: Analyzing trace with hash -196142851, now seen corresponding path program 8 times [2018-10-24 12:38:06,605 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:06,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:06,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:06,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:06,606 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:06,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:06,750 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:06,751 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:06,751 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:06,751 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:06,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:06,752 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:06,762 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:06,762 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:06,787 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:38:06,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:06,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:06,826 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:06,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:07,056 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:07,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:38:07,077 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:07,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:38:07,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:38:07,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:38:07,079 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 13 states. [2018-10-24 12:38:07,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:07,144 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:38:07,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:38:07,145 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2018-10-24 12:38:07,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:07,146 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:38:07,146 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:38:07,147 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:38:07,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:38:07,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-24 12:38:07,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:38:07,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-24 12:38:07,153 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-24 12:38:07,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:07,153 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-24 12:38:07,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:38:07,153 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-24 12:38:07,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:38:07,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:07,154 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:07,155 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:07,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:07,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1496891779, now seen corresponding path program 9 times [2018-10-24 12:38:07,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:07,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,156 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:07,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:07,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:07,461 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:07,462 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:07,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:07,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:07,469 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:07,470 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:07,503 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:07,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:07,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:07,529 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:07,892 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:07,913 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:07,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:38:07,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:07,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:38:07,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:38:07,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:38:07,915 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 14 states. [2018-10-24 12:38:07,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:07,966 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:38:07,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:38:07,967 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2018-10-24 12:38:07,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:07,969 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:38:07,969 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:38:07,970 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:38:07,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:38:07,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-24 12:38:07,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:38:07,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 12:38:07,975 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-24 12:38:07,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:07,976 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 12:38:07,976 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:38:07,976 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 12:38:07,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:38:07,977 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:07,977 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:07,977 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:07,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:07,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1381705981, now seen corresponding path program 10 times [2018-10-24 12:38:07,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:07,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,978 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:07,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:07,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:07,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:08,381 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:08,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:08,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:08,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:08,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:08,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:08,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:08,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:08,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:08,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:08,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:08,476 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:08,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:08,744 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:08,765 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:08,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:38:08,766 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:08,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:38:08,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:38:08,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:38:08,767 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 15 states. [2018-10-24 12:38:08,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:08,821 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:38:08,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:38:08,822 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2018-10-24 12:38:08,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:08,822 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:38:08,823 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 12:38:08,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:38:08,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 12:38:08,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-24 12:38:08,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:38:08,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-24 12:38:08,829 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-24 12:38:08,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:08,829 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-24 12:38:08,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:38:08,830 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-24 12:38:08,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:38:08,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:08,831 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:08,831 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:08,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:08,832 INFO L82 PathProgramCache]: Analyzing trace with hash 75574909, now seen corresponding path program 11 times [2018-10-24 12:38:08,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:08,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:08,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:08,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:08,833 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:08,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:09,144 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:09,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:09,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:09,145 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:09,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:09,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:09,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:09,153 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:09,153 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:09,198 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:38:09,198 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:09,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:09,435 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:09,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:10,026 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:10,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:38:10,047 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:10,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:38:10,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:38:10,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=535, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:38:10,049 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 16 states. [2018-10-24 12:38:10,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:10,142 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:38:10,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:38:10,142 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2018-10-24 12:38:10,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:10,143 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:38:10,144 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:38:10,145 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:38:10,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:38:10,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-24 12:38:10,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:38:10,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 12:38:10,150 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-24 12:38:10,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:10,150 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 12:38:10,150 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:38:10,150 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 12:38:10,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:38:10,151 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:10,151 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:10,152 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:10,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:10,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1528510717, now seen corresponding path program 12 times [2018-10-24 12:38:10,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:10,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:10,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,153 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:10,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:10,392 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,392 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:10,392 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:10,392 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:10,392 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:10,392 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:10,392 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:10,400 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:10,400 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:10,425 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:10,425 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:10,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:10,504 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:10,816 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:10,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:10,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:38:10,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:10,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:38:10,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:38:10,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=604, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:38:10,840 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 17 states. [2018-10-24 12:38:10,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:10,906 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:38:10,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:38:10,907 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2018-10-24 12:38:10,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:10,908 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:38:10,908 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:38:10,909 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:38:10,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:38:10,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-24 12:38:10,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:38:10,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-24 12:38:10,913 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-24 12:38:10,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:10,914 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-24 12:38:10,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:38:10,914 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-24 12:38:10,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:38:10,915 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:10,915 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:10,915 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:10,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:10,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1258757757, now seen corresponding path program 13 times [2018-10-24 12:38:10,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:10,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:10,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:10,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:10,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:11,107 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:11,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:11,107 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:11,107 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:11,107 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:11,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:11,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 12:38:11,117 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:11,117 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:11,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:11,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:11,292 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:11,292 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:11,702 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:11,725 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:11,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:38:11,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:11,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:38:11,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:38:11,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=677, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:38:11,727 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 18 states. [2018-10-24 12:38:11,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:11,778 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:38:11,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:38:11,778 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2018-10-24 12:38:11,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:11,779 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:38:11,780 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:38:11,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:38:11,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:38:11,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-24 12:38:11,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:38:11,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 12:38:11,787 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-24 12:38:11,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:11,788 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 12:38:11,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:38:11,788 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 12:38:11,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:38:11,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:11,789 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:11,789 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:11,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:11,789 INFO L82 PathProgramCache]: Analyzing trace with hash 932137213, now seen corresponding path program 14 times [2018-10-24 12:38:11,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:11,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:11,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:11,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:11,791 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:11,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:12,115 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:12,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:12,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:12,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:12,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:12,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:12,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:12,125 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:12,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:12,163 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:38:12,164 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:12,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:12,202 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:12,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:13,237 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:13,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:13,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:38:13,259 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:13,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:38:13,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:38:13,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:38:13,260 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 19 states. [2018-10-24 12:38:13,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:13,316 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:38:13,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:38:13,316 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 53 [2018-10-24 12:38:13,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:13,317 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:38:13,318 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:38:13,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:38:13,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:38:13,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-24 12:38:13,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:38:13,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-24 12:38:13,325 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-24 12:38:13,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:13,325 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-24 12:38:13,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:38:13,326 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-24 12:38:13,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:38:13,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:13,327 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:13,327 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:13,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:13,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1319563651, now seen corresponding path program 15 times [2018-10-24 12:38:13,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:13,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:13,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:13,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:13,328 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:13,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:13,524 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:13,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:13,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:13,525 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:13,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:13,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:13,525 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:13,533 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:13,533 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:13,574 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:13,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:13,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:13,623 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:13,623 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:14,757 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:14,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:14,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:38:14,778 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:14,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:38:14,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:38:14,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=835, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:38:14,780 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 20 states. [2018-10-24 12:38:14,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:14,961 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:38:14,961 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:38:14,961 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 56 [2018-10-24 12:38:14,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:14,962 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:38:14,962 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:38:14,963 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=577, Invalid=905, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:38:14,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:38:14,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-24 12:38:14,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:38:14,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-24 12:38:14,970 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-24 12:38:14,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:14,970 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-24 12:38:14,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:38:14,970 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-24 12:38:14,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:38:14,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:14,973 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:14,973 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:14,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:14,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1354193149, now seen corresponding path program 16 times [2018-10-24 12:38:14,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:14,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:14,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:14,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:14,975 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:14,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,609 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:15,609 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:15,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:15,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:15,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:15,618 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:15,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:15,952 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:15,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:17,439 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:17,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:17,462 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:38:17,462 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:17,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:38:17,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:38:17,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:38:17,463 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 21 states. [2018-10-24 12:38:17,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:17,514 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:38:17,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:38:17,514 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 59 [2018-10-24 12:38:17,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:17,515 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:38:17,516 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:38:17,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:38:17,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:38:17,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-24 12:38:17,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:38:17,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-24 12:38:17,522 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-24 12:38:17,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:17,522 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-24 12:38:17,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:38:17,522 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-24 12:38:17,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-24 12:38:17,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:17,523 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:17,524 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:17,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:17,524 INFO L82 PathProgramCache]: Analyzing trace with hash 779550333, now seen corresponding path program 17 times [2018-10-24 12:38:17,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:17,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:17,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:17,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:17,525 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:17,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:18,674 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:18,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:18,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:18,674 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:18,674 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:18,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:18,674 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:18,682 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:18,682 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:18,721 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:38:18,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:18,724 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:18,757 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:18,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:19,201 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:19,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:19,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:38:19,223 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:19,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:38:19,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:38:19,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:38:19,225 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 22 states. [2018-10-24 12:38:19,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:19,270 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:38:19,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:38:19,270 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 62 [2018-10-24 12:38:19,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:19,271 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:38:19,271 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:38:19,273 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:38:19,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:38:19,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-24 12:38:19,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:38:19,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-24 12:38:19,276 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-24 12:38:19,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:19,277 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-24 12:38:19,277 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:38:19,277 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-24 12:38:19,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:38:19,278 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:19,278 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:19,278 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:19,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:19,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1335060733, now seen corresponding path program 18 times [2018-10-24 12:38:19,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:19,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:19,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:19,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:19,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:19,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:20,024 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:20,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:20,024 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:20,024 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:20,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:20,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:20,025 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:20,036 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:20,036 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:20,069 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:20,069 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:20,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:20,183 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:20,183 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:20,838 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:20,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:20,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:38:20,860 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:20,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:38:20,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:38:20,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=790, Invalid=1102, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:20,862 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 23 states. [2018-10-24 12:38:20,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:20,927 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:38:20,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:38:20,927 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2018-10-24 12:38:20,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:20,928 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:38:20,928 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:38:20,930 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=796, Invalid=1184, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:38:20,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:38:20,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-24 12:38:20,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:38:20,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-24 12:38:20,935 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-24 12:38:20,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:20,936 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-24 12:38:20,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:38:20,936 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-24 12:38:20,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:38:20,937 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:20,937 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:20,937 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:20,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:20,937 INFO L82 PathProgramCache]: Analyzing trace with hash 2036395645, now seen corresponding path program 19 times [2018-10-24 12:38:20,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:20,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:20,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:20,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:20,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:20,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:21,244 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:21,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:21,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:21,244 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:21,244 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:21,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:21,244 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:21,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:21,252 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:21,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:21,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:21,315 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:21,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:21,979 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:22,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:22,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-24 12:38:22,000 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:22,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:38:22,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:38:22,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=1199, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:38:22,002 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 24 states. [2018-10-24 12:38:22,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:22,088 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:38:22,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:38:22,089 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 68 [2018-10-24 12:38:22,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:22,090 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:38:22,090 INFO L226 Difference]: Without dead ends: 73 [2018-10-24 12:38:22,091 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=877, Invalid=1285, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:38:22,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-24 12:38:22,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-24 12:38:22,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:38:22,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-24 12:38:22,096 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-24 12:38:22,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:22,096 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-24 12:38:22,096 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:38:22,096 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-24 12:38:22,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:38:22,097 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:22,097 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:22,097 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:22,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:22,098 INFO L82 PathProgramCache]: Analyzing trace with hash 488863997, now seen corresponding path program 20 times [2018-10-24 12:38:22,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:22,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:22,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:22,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:22,099 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:22,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:22,561 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:22,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:22,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:22,562 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:22,562 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:22,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:22,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:22,572 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:22,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:22,626 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:38:22,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:22,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:22,820 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:22,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:23,547 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:23,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:23,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-24 12:38:23,571 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:23,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:38:23,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:38:23,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:38:23,572 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 25 states. [2018-10-24 12:38:23,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:23,652 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:38:23,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:38:23,655 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 71 [2018-10-24 12:38:23,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:23,656 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:38:23,656 INFO L226 Difference]: Without dead ends: 76 [2018-10-24 12:38:23,658 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:38:23,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-24 12:38:23,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-24 12:38:23,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-24 12:38:23,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-24 12:38:23,661 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-24 12:38:23,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:23,661 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-24 12:38:23,662 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:38:23,662 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-24 12:38:23,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:38:23,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:23,663 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:23,663 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:23,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:23,663 INFO L82 PathProgramCache]: Analyzing trace with hash 152493693, now seen corresponding path program 21 times [2018-10-24 12:38:23,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:23,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:23,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:23,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:23,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:23,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:24,171 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:24,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:24,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:24,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:24,172 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:24,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:24,172 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:24,180 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:24,180 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:24,224 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:24,224 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:24,226 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:24,279 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:24,279 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:24,882 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:24,903 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:24,903 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-24 12:38:24,903 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:24,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:38:24,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:38:24,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=1405, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:38:24,905 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 26 states. [2018-10-24 12:38:24,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:24,982 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:38:24,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:38:24,983 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 74 [2018-10-24 12:38:24,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:24,984 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:38:24,984 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:38:24,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1051, Invalid=1499, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:38:24,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:38:24,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-24 12:38:24,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:38:24,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-24 12:38:24,990 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-24 12:38:24,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:24,990 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-24 12:38:24,990 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:38:24,990 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-24 12:38:24,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:38:24,991 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:24,991 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:24,991 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:24,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:24,992 INFO L82 PathProgramCache]: Analyzing trace with hash -496531203, now seen corresponding path program 22 times [2018-10-24 12:38:24,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:24,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:24,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:24,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:24,993 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:25,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:25,923 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:25,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:25,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:25,923 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:25,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:25,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:25,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:25,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:25,932 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:25,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:25,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:26,025 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:26,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:26,675 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:26,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:26,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-24 12:38:26,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:26,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:38:26,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:38:26,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1138, Invalid=1514, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:38:26,698 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 27 states. [2018-10-24 12:38:26,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:26,756 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-24 12:38:26,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:38:26,757 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 77 [2018-10-24 12:38:26,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:26,758 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:38:26,758 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:38:26,760 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1144, Invalid=1612, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:38:26,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:38:26,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-24 12:38:26,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-24 12:38:26,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-24 12:38:26,763 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-24 12:38:26,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:26,763 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-24 12:38:26,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:38:26,763 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-24 12:38:26,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-24 12:38:26,764 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:26,764 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:26,764 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:26,764 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:26,764 INFO L82 PathProgramCache]: Analyzing trace with hash 345558653, now seen corresponding path program 23 times [2018-10-24 12:38:26,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:26,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:26,765 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:26,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:26,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:26,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:27,368 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:27,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,369 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:27,369 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:27,369 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:27,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:27,369 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:27,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:27,377 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:27,428 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:38:27,429 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:27,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:27,806 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:27,807 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:28,791 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:28,812 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:28,812 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-24 12:38:28,812 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:28,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:38:28,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:38:28,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1235, Invalid=1627, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:38:28,814 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 28 states. [2018-10-24 12:38:28,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:28,888 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-24 12:38:28,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:38:28,888 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 80 [2018-10-24 12:38:28,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:28,889 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:38:28,889 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:38:28,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1241, Invalid=1729, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:38:28,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:38:28,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-24 12:38:28,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:38:28,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-24 12:38:28,897 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-24 12:38:28,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:28,897 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-24 12:38:28,897 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:38:28,897 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-24 12:38:28,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-24 12:38:28,898 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:28,898 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:28,898 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:28,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:28,899 INFO L82 PathProgramCache]: Analyzing trace with hash 140482813, now seen corresponding path program 24 times [2018-10-24 12:38:28,899 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:28,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,899 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:28,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,900 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:28,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:29,334 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:29,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:29,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:29,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:29,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:29,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:29,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:29,342 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:29,343 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:29,392 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:29,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:29,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:29,483 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:29,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:30,496 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:30,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:30,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:38:30,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:30,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:38:30,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:38:30,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:38:30,518 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 29 states. [2018-10-24 12:38:30,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:30,621 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-24 12:38:30,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:38:30,621 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 83 [2018-10-24 12:38:30,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:30,622 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:38:30,622 INFO L226 Difference]: Without dead ends: 88 [2018-10-24 12:38:30,624 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:38:30,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-24 12:38:30,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-24 12:38:30,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:38:30,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-24 12:38:30,627 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-24 12:38:30,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:30,628 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-24 12:38:30,628 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:38:30,628 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-24 12:38:30,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-24 12:38:30,628 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:30,629 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:30,629 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:30,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:30,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1830371715, now seen corresponding path program 25 times [2018-10-24 12:38:30,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:30,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:30,630 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:30,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:30,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:30,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,108 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:31,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:31,108 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:31,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:31,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:31,109 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:31,116 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:31,116 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:31,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:31,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:31,207 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:31,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:32,076 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:32,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:32,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-24 12:38:32,096 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:32,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:38:32,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:38:32,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:38:32,098 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 30 states. [2018-10-24 12:38:32,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:32,187 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-24 12:38:32,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:38:32,187 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 86 [2018-10-24 12:38:32,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:32,188 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:38:32,189 INFO L226 Difference]: Without dead ends: 91 [2018-10-24 12:38:32,190 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:38:32,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-24 12:38:32,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-24 12:38:32,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-24 12:38:32,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-24 12:38:32,193 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-24 12:38:32,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:32,193 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-24 12:38:32,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:38:32,194 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-24 12:38:32,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:38:32,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:32,194 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:32,195 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:32,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:32,195 INFO L82 PathProgramCache]: Analyzing trace with hash 940288253, now seen corresponding path program 26 times [2018-10-24 12:38:32,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:32,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:32,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:32,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:32,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:32,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:32,790 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:32,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:32,791 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:32,791 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:32,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:32,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:32,791 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:32,799 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:32,799 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:32,862 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:38:32,863 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:32,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:32,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:32,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:34,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:34,059 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:34,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-24 12:38:34,060 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:34,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:38:34,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:38:34,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:38:34,061 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 31 states. [2018-10-24 12:38:34,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:34,149 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-24 12:38:34,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:38:34,154 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-24 12:38:34,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:34,155 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:38:34,155 INFO L226 Difference]: Without dead ends: 94 [2018-10-24 12:38:34,155 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:38:34,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-24 12:38:34,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-24 12:38:34,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-24 12:38:34,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-24 12:38:34,158 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-24 12:38:34,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:34,159 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-24 12:38:34,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:38:34,159 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-24 12:38:34,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-24 12:38:34,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:34,159 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:34,160 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:34,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:34,160 INFO L82 PathProgramCache]: Analyzing trace with hash 989900413, now seen corresponding path program 27 times [2018-10-24 12:38:34,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:34,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:34,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,161 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:34,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:34,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:34,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:34,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:34,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:34,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:34,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:34,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:34,850 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:34,850 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:34,896 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:34,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:34,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:34,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:34,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:36,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:36,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:36,405 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-24 12:38:36,405 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:36,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:38:36,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:38:36,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1663, Invalid=2119, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:38:36,406 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 32 states. [2018-10-24 12:38:36,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:36,517 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-24 12:38:36,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:38:36,518 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 92 [2018-10-24 12:38:36,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:36,518 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:38:36,518 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:38:36,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1669, Invalid=2237, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:38:36,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:38:36,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-24 12:38:36,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-24 12:38:36,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-24 12:38:36,523 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-24 12:38:36,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:36,524 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-24 12:38:36,524 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:38:36,524 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-24 12:38:36,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:38:36,525 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:36,525 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:36,525 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:36,525 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:36,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1517009149, now seen corresponding path program 28 times [2018-10-24 12:38:36,525 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:36,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:36,526 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:36,526 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:36,526 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:36,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:37,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:37,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:37,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:37,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:37,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:37,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:37,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:37,062 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:37,062 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:37,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:37,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:37,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:37,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:38,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:38,233 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:38,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-24 12:38:38,233 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:38,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:38:38,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:38:38,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1780, Invalid=2252, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:38:38,235 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 33 states. [2018-10-24 12:38:38,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:38,337 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-24 12:38:38,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:38:38,344 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 95 [2018-10-24 12:38:38,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:38,345 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:38:38,345 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:38:38,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1786, Invalid=2374, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:38:38,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:38:38,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-24 12:38:38,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:38:38,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-24 12:38:38,349 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-24 12:38:38,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:38,350 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-24 12:38:38,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:38:38,350 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-24 12:38:38,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-24 12:38:38,350 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:38,351 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:38,351 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:38,351 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:38,351 INFO L82 PathProgramCache]: Analyzing trace with hash -2082038147, now seen corresponding path program 29 times [2018-10-24 12:38:38,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:38,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:38,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:38,352 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:38,352 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:38,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:38,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:38,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:38,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:38,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:38,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:38,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:38,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:38,955 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:38,956 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:39,019 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:38:39,019 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:39,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:39,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:40,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:40,154 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:40,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-24 12:38:40,154 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:40,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:38:40,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:38:40,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=2389, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:38:40,156 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 34 states. [2018-10-24 12:38:40,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:40,271 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-24 12:38:40,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:38:40,272 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 98 [2018-10-24 12:38:40,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:40,273 INFO L225 Difference]: With dead ends: 108 [2018-10-24 12:38:40,273 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:38:40,274 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1907, Invalid=2515, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:38:40,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:38:40,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-24 12:38:40,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:38:40,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-24 12:38:40,278 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-24 12:38:40,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:40,279 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-24 12:38:40,279 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:38:40,279 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-24 12:38:40,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 12:38:40,280 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:40,280 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:40,280 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:40,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:40,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1736455939, now seen corresponding path program 30 times [2018-10-24 12:38:40,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:40,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:40,281 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:40,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:40,281 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:40,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:41,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:41,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:41,020 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:41,021 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:41,021 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:41,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:41,021 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:41,029 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:41,030 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:41,080 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:41,080 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:41,083 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:41,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:41,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:42,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:42,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:42,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-24 12:38:42,359 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:42,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:38:42,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:38:42,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:38:42,361 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 35 states. [2018-10-24 12:38:42,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:42,494 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-24 12:38:42,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:38:42,494 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 101 [2018-10-24 12:38:42,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:42,495 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:38:42,495 INFO L226 Difference]: Without dead ends: 106 [2018-10-24 12:38:42,496 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:38:42,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-24 12:38:42,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-24 12:38:42,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:38:42,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-24 12:38:42,501 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-24 12:38:42,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:42,501 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-24 12:38:42,501 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:38:42,501 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-24 12:38:42,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:38:42,502 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:42,502 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:42,503 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:42,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:42,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1533505923, now seen corresponding path program 31 times [2018-10-24 12:38:42,503 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:42,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:42,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:42,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:42,504 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:42,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:43,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:43,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:43,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:43,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:43,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:43,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:43,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:43,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:43,076 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:43,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:43,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:43,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:43,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:44,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:44,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:44,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-24 12:38:44,429 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:44,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:38:44,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:38:44,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2155, Invalid=2675, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:38:44,431 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 36 states. [2018-10-24 12:38:44,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:44,564 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-24 12:38:44,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:38:44,565 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 104 [2018-10-24 12:38:44,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:44,566 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:38:44,566 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:38:44,567 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2161, Invalid=2809, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:38:44,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:38:44,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-24 12:38:44,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-24 12:38:44,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-24 12:38:44,571 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-24 12:38:44,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:44,572 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-24 12:38:44,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:38:44,572 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-24 12:38:44,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-24 12:38:44,572 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:44,573 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:44,573 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:44,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:44,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1531435261, now seen corresponding path program 32 times [2018-10-24 12:38:44,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:44,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:44,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:44,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:44,574 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:44,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:45,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:45,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:45,290 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:45,290 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:45,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:45,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:45,290 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:45,297 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:45,297 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:45,422 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:38:45,423 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:45,426 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:45,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:45,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:47,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:47,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:47,152 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-24 12:38:47,152 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:47,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:38:47,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:38:47,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2288, Invalid=2824, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:38:47,154 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 37 states. [2018-10-24 12:38:47,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:47,227 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-24 12:38:47,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:38:47,227 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 107 [2018-10-24 12:38:47,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:47,228 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:38:47,229 INFO L226 Difference]: Without dead ends: 112 [2018-10-24 12:38:47,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2294, Invalid=2962, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:38:47,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-24 12:38:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-24 12:38:47,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-24 12:38:47,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-24 12:38:47,234 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-24 12:38:47,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:47,234 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-24 12:38:47,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:38:47,234 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-24 12:38:47,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-24 12:38:47,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:47,235 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:47,235 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:47,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:47,235 INFO L82 PathProgramCache]: Analyzing trace with hash -1810465155, now seen corresponding path program 33 times [2018-10-24 12:38:47,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:47,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:47,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:47,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:47,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:47,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:48,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:48,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:48,494 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:48,494 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:48,494 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:48,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:48,494 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:48,501 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:48,502 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:48,560 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:48,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:48,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:48,612 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:48,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:49,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:50,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:50,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-24 12:38:50,003 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:50,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:38:50,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:38:50,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:38:50,004 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 38 states. [2018-10-24 12:38:50,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:50,088 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-24 12:38:50,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:38:50,088 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 110 [2018-10-24 12:38:50,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:50,089 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:38:50,089 INFO L226 Difference]: Without dead ends: 115 [2018-10-24 12:38:50,090 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:38:50,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-24 12:38:50,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-24 12:38:50,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-24 12:38:50,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-24 12:38:50,094 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-24 12:38:50,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:50,094 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-24 12:38:50,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:38:50,095 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-24 12:38:50,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-24 12:38:50,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:50,095 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:50,096 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:50,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:50,096 INFO L82 PathProgramCache]: Analyzing trace with hash 1271130365, now seen corresponding path program 34 times [2018-10-24 12:38:50,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:50,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:50,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:50,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:50,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:50,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:51,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:51,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:51,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:51,321 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:51,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:51,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:51,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:51,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:51,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:51,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:51,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:51,436 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:52,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:52,993 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:52,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-24 12:38:52,994 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:52,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:38:52,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:38:52,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:38:52,995 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 39 states. [2018-10-24 12:38:53,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:53,105 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-24 12:38:53,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:38:53,105 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 113 [2018-10-24 12:38:53,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:53,107 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:38:53,107 INFO L226 Difference]: Without dead ends: 118 [2018-10-24 12:38:53,107 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:38:53,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-24 12:38:53,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-24 12:38:53,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-24 12:38:53,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-24 12:38:53,112 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-24 12:38:53,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:53,112 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-24 12:38:53,112 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:38:53,112 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-24 12:38:53,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:38:53,113 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:53,113 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:53,113 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:53,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:53,113 INFO L82 PathProgramCache]: Analyzing trace with hash 157314685, now seen corresponding path program 35 times [2018-10-24 12:38:53,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:53,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:53,114 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:53,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:53,114 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:53,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:53,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:53,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:53,959 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:53,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:53,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:53,960 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:53,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:53,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:54,046 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:38:54,046 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:54,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:54,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:54,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:55,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:55,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:55,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-24 12:38:55,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:55,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:38:55,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:38:55,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2711, Invalid=3295, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:38:55,660 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 40 states. [2018-10-24 12:38:55,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:55,751 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-24 12:38:55,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:38:55,752 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 116 [2018-10-24 12:38:55,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:55,753 INFO L225 Difference]: With dead ends: 126 [2018-10-24 12:38:55,753 INFO L226 Difference]: Without dead ends: 121 [2018-10-24 12:38:55,754 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2717, Invalid=3445, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:38:55,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-24 12:38:55,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-24 12:38:55,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-24 12:38:55,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-24 12:38:55,758 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-24 12:38:55,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:55,758 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-24 12:38:55,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:38:55,758 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-24 12:38:55,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:38:55,759 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:55,759 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:55,759 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:55,760 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:55,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1391720701, now seen corresponding path program 36 times [2018-10-24 12:38:55,760 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:55,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:55,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:55,761 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:55,761 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:55,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:56,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:56,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:56,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:56,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:56,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:56,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:56,855 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:56,863 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:56,863 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:56,927 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:56,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:56,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:57,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:57,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:59,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:59,072 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:59,072 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-24 12:38:59,072 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:59,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:38:59,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:38:59,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2860, Invalid=3460, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:38:59,074 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 41 states. [2018-10-24 12:38:59,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:59,169 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-24 12:38:59,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:38:59,169 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-24 12:38:59,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:59,170 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:38:59,170 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:38:59,171 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2866, Invalid=3614, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:38:59,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:38:59,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-24 12:38:59,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-24 12:38:59,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-24 12:38:59,174 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-24 12:38:59,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:59,175 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-24 12:38:59,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:38:59,175 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-24 12:38:59,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-24 12:38:59,175 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:59,176 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:59,176 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:59,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:59,176 INFO L82 PathProgramCache]: Analyzing trace with hash 2071355005, now seen corresponding path program 37 times [2018-10-24 12:38:59,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:59,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:59,177 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:59,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:59,177 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:59,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:59,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:38:59,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:59,900 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:59,900 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:59,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:59,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:59,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:38:59,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:59,908 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:59,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:59,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:00,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:00,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:01,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:01,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:01,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-24 12:39:01,761 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:01,762 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:39:01,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:39:01,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3013, Invalid=3629, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:39:01,763 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 42 states. [2018-10-24 12:39:02,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:02,006 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-24 12:39:02,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:39:02,007 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 122 [2018-10-24 12:39:02,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:02,008 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:39:02,008 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:39:02,009 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 204 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3019, Invalid=3787, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:39:02,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:39:02,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-24 12:39:02,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-24 12:39:02,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-24 12:39:02,014 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-24 12:39:02,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:02,014 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-24 12:39:02,014 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:39:02,014 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-24 12:39:02,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:39:02,015 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:02,015 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:02,015 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:02,015 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:02,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1713895171, now seen corresponding path program 38 times [2018-10-24 12:39:02,016 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:02,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:02,016 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:02,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:02,017 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:02,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:02,844 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:02,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:02,844 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:02,845 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:02,845 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:02,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:02,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:02,876 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:02,876 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:02,961 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-24 12:39:02,961 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:02,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:03,478 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:03,478 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:05,490 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:05,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:05,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-24 12:39:05,512 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:05,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:39:05,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:39:05,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3170, Invalid=3802, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:39:05,513 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 43 states. [2018-10-24 12:39:05,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:05,635 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-24 12:39:05,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:39:05,635 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 125 [2018-10-24 12:39:05,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:05,637 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:39:05,637 INFO L226 Difference]: Without dead ends: 130 [2018-10-24 12:39:05,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 209 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3176, Invalid=3964, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:39:05,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-24 12:39:05,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-24 12:39:05,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:39:05,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-24 12:39:05,642 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-24 12:39:05,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:05,642 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-24 12:39:05,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:39:05,642 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-24 12:39:05,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-24 12:39:05,643 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:05,643 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:05,643 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:05,644 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:05,644 INFO L82 PathProgramCache]: Analyzing trace with hash 559435389, now seen corresponding path program 39 times [2018-10-24 12:39:05,644 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:05,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:05,645 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:05,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:05,645 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:05,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:06,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:06,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:06,754 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:06,754 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:06,754 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:06,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:06,754 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:06,761 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:06,761 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:06,829 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:06,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:06,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:06,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:06,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:08,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:08,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:08,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-24 12:39:08,797 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:08,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:39:08,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:39:08,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3331, Invalid=3979, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:39:08,799 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 44 states. [2018-10-24 12:39:09,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:09,677 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-24 12:39:09,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:39:09,678 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 128 [2018-10-24 12:39:09,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:09,679 INFO L225 Difference]: With dead ends: 138 [2018-10-24 12:39:09,679 INFO L226 Difference]: Without dead ends: 133 [2018-10-24 12:39:09,680 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3337, Invalid=4145, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:39:09,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-24 12:39:09,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-24 12:39:09,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-24 12:39:09,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-24 12:39:09,685 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-24 12:39:09,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:09,685 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-24 12:39:09,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:39:09,685 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-24 12:39:09,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-24 12:39:09,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:09,686 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:09,687 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:09,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:09,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1989142275, now seen corresponding path program 40 times [2018-10-24 12:39:09,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:09,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:09,688 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:09,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:09,688 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:09,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:11,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:11,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:11,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:11,768 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:11,768 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:11,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:11,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:11,777 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:11,777 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:11,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:11,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:11,933 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:11,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:13,859 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:13,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:13,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-24 12:39:13,889 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:13,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:39:13,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:39:13,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=4160, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:39:13,891 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 45 states. [2018-10-24 12:39:14,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:14,091 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-24 12:39:14,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:39:14,092 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 131 [2018-10-24 12:39:14,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:14,093 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:39:14,093 INFO L226 Difference]: Without dead ends: 136 [2018-10-24 12:39:14,094 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3502, Invalid=4330, Unknown=0, NotChecked=0, Total=7832 [2018-10-24 12:39:14,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-24 12:39:14,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-24 12:39:14,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-24 12:39:14,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-24 12:39:14,099 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-24 12:39:14,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:14,099 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-24 12:39:14,099 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:39:14,099 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-24 12:39:14,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:39:14,100 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:14,100 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:14,100 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:14,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:14,101 INFO L82 PathProgramCache]: Analyzing trace with hash -234471811, now seen corresponding path program 41 times [2018-10-24 12:39:14,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:14,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:14,102 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:14,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:14,102 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:15,710 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:15,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:15,710 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:15,711 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:15,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:15,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:15,711 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:15,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:15,718 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:15,926 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-24 12:39:15,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:15,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:16,094 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:16,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:18,131 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:18,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:18,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-24 12:39:18,151 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:18,151 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:39:18,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:39:18,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3665, Invalid=4345, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:39:18,153 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 46 states. [2018-10-24 12:39:18,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:18,857 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-24 12:39:18,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:39:18,858 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 134 [2018-10-24 12:39:18,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:18,859 INFO L225 Difference]: With dead ends: 144 [2018-10-24 12:39:18,859 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:39:18,860 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3671, Invalid=4519, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:39:18,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:39:18,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-24 12:39:18,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-24 12:39:18,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-24 12:39:18,865 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-24 12:39:18,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:18,865 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-24 12:39:18,865 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:39:18,865 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-24 12:39:18,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-24 12:39:18,866 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:18,866 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:18,866 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:18,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:18,867 INFO L82 PathProgramCache]: Analyzing trace with hash -893638403, now seen corresponding path program 42 times [2018-10-24 12:39:18,867 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:18,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:18,868 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:18,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:18,868 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:18,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:19,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:19,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:19,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:19,840 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:19,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:19,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:19,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:19,848 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:19,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:19,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:19,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:19,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:20,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:20,258 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:22,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:22,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:22,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-24 12:39:22,398 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:22,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:39:22,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:39:22,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3838, Invalid=4534, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:39:22,399 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 47 states. [2018-10-24 12:39:22,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:22,522 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-24 12:39:22,522 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:39:22,522 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 137 [2018-10-24 12:39:22,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:22,523 INFO L225 Difference]: With dead ends: 147 [2018-10-24 12:39:22,523 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:39:22,523 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3844, Invalid=4712, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:39:22,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:39:22,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-24 12:39:22,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:39:22,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-24 12:39:22,527 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-24 12:39:22,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:22,527 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-24 12:39:22,528 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:39:22,528 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-24 12:39:22,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-24 12:39:22,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:22,529 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:22,529 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:22,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:22,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1535103363, now seen corresponding path program 43 times [2018-10-24 12:39:22,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:22,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:22,530 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:22,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:22,530 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:22,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:23,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:23,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:23,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:23,385 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:23,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:23,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:23,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:23,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:23,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:23,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:23,469 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:23,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:23,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:25,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:25,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:25,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-24 12:39:25,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:25,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:39:25,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:39:25,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:39:25,752 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 48 states. [2018-10-24 12:39:25,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:25,900 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-24 12:39:25,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:39:25,900 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 140 [2018-10-24 12:39:25,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:25,901 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:39:25,901 INFO L226 Difference]: Without dead ends: 145 [2018-10-24 12:39:25,902 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-24 12:39:25,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-24 12:39:25,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-24 12:39:25,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-24 12:39:25,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-24 12:39:25,906 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-24 12:39:25,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:25,907 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-24 12:39:25,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:39:25,907 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-24 12:39:25,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-24 12:39:25,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:25,908 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:25,908 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:25,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:25,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1186740477, now seen corresponding path program 44 times [2018-10-24 12:39:25,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:25,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:25,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:25,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:25,910 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:25,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:26,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:26,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:26,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:26,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:26,956 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:26,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:26,956 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:26,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:26,966 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:27,064 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-24 12:39:27,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:27,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:27,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:27,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:29,373 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:29,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:29,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-24 12:39:29,395 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:29,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:39:29,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:39:29,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:39:29,396 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 49 states. [2018-10-24 12:39:30,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:30,205 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-24 12:39:30,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:39:30,206 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 143 [2018-10-24 12:39:30,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:30,207 INFO L225 Difference]: With dead ends: 153 [2018-10-24 12:39:30,207 INFO L226 Difference]: Without dead ends: 148 [2018-10-24 12:39:30,208 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 239 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:39:30,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-24 12:39:30,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-24 12:39:30,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-24 12:39:30,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-24 12:39:30,211 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-24 12:39:30,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:30,212 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-24 12:39:30,212 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:39:30,212 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-24 12:39:30,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-24 12:39:30,213 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:30,213 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:30,213 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:30,213 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:30,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1345970563, now seen corresponding path program 45 times [2018-10-24 12:39:30,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:30,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:30,214 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:30,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:30,214 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:30,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:31,314 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:31,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:31,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:31,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:31,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:31,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:31,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:31,323 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:31,323 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:31,399 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:31,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:31,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:31,450 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:31,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:33,846 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:33,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:33,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-24 12:39:33,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:33,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:39:33,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:39:33,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=5125, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:39:33,868 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 50 states. [2018-10-24 12:39:33,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:33,966 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-24 12:39:33,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:39:33,967 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 146 [2018-10-24 12:39:33,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:33,968 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:39:33,968 INFO L226 Difference]: Without dead ends: 151 [2018-10-24 12:39:33,969 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 244 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4387, Invalid=5315, Unknown=0, NotChecked=0, Total=9702 [2018-10-24 12:39:33,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-24 12:39:33,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-24 12:39:33,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-24 12:39:33,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-24 12:39:33,973 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-24 12:39:33,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:33,973 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-24 12:39:33,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:39:33,973 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-24 12:39:33,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-24 12:39:33,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:33,974 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:33,974 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:33,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:33,975 INFO L82 PathProgramCache]: Analyzing trace with hash 644892925, now seen corresponding path program 46 times [2018-10-24 12:39:33,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:33,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:33,976 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:33,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:33,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:33,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:35,264 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:35,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:35,265 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:35,265 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:35,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:35,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:35,265 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:35,275 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:35,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:35,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:35,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:35,473 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:35,473 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:38,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:38,256 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:38,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-24 12:39:38,257 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:38,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:39:38,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:39:38,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4570, Invalid=5330, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:39:38,258 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 51 states. [2018-10-24 12:39:38,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:38,391 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-24 12:39:38,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:39:38,392 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-24 12:39:38,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:38,392 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:39:38,392 INFO L226 Difference]: Without dead ends: 154 [2018-10-24 12:39:38,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4576, Invalid=5524, Unknown=0, NotChecked=0, Total=10100 [2018-10-24 12:39:38,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-24 12:39:38,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-24 12:39:38,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-24 12:39:38,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-24 12:39:38,398 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-24 12:39:38,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:38,398 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-24 12:39:38,398 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:39:38,398 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-24 12:39:38,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-24 12:39:38,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:38,399 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:38,400 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:38,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:38,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1255673469, now seen corresponding path program 47 times [2018-10-24 12:39:38,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:38,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:38,401 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:38,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:38,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:38,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:39,423 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:39,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:39,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:39,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:39,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:39,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:39,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:39,433 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:39,433 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:39,540 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-24 12:39:39,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:39,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:39,596 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:39,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:42,206 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:42,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:42,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-24 12:39:42,226 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:42,227 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:39:42,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:39:42,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4763, Invalid=5539, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:39:42,228 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 52 states. [2018-10-24 12:39:42,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:42,387 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-24 12:39:42,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:39:42,387 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 152 [2018-10-24 12:39:42,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:42,388 INFO L225 Difference]: With dead ends: 162 [2018-10-24 12:39:42,388 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:39:42,389 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4769, Invalid=5737, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:39:42,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:39:42,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-24 12:39:42,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-24 12:39:42,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-24 12:39:42,393 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-24 12:39:42,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:42,394 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-24 12:39:42,394 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:39:42,394 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-24 12:39:42,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-24 12:39:42,395 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:42,395 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:42,395 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:42,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:42,396 INFO L82 PathProgramCache]: Analyzing trace with hash -757573379, now seen corresponding path program 48 times [2018-10-24 12:39:42,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:42,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:42,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:42,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:42,397 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:42,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:43,395 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:43,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:43,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:43,396 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:43,396 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:43,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:43,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:43,404 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:43,405 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:43,489 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:43,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:43,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:43,877 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:43,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:46,513 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:46,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:46,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-24 12:39:46,533 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:46,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:39:46,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:39:46,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4960, Invalid=5752, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:39:46,535 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 53 states. [2018-10-24 12:39:46,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:46,693 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-24 12:39:46,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:39:46,693 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 155 [2018-10-24 12:39:46,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:46,694 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:39:46,694 INFO L226 Difference]: Without dead ends: 160 [2018-10-24 12:39:46,695 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 259 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4966, Invalid=5954, Unknown=0, NotChecked=0, Total=10920 [2018-10-24 12:39:46,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-24 12:39:46,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-24 12:39:46,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-24 12:39:46,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-24 12:39:46,698 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-24 12:39:46,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:46,698 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-24 12:39:46,698 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:39:46,698 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-24 12:39:46,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-24 12:39:46,699 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:46,699 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:46,699 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:46,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:46,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1823866493, now seen corresponding path program 49 times [2018-10-24 12:39:46,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:46,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:46,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:46,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:46,701 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:46,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:47,887 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:47,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:47,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:47,887 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:47,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:47,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:47,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:47,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:47,895 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:47,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:47,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:48,231 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:48,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:51,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:51,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:51,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-24 12:39:51,038 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:51,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:39:51,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:39:51,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5161, Invalid=5969, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:39:51,039 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 54 states. [2018-10-24 12:39:51,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:51,180 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-24 12:39:51,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:39:51,180 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 158 [2018-10-24 12:39:51,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:51,181 INFO L225 Difference]: With dead ends: 168 [2018-10-24 12:39:51,182 INFO L226 Difference]: Without dead ends: 163 [2018-10-24 12:39:51,182 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 264 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5167, Invalid=6175, Unknown=0, NotChecked=0, Total=11342 [2018-10-24 12:39:51,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-24 12:39:51,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-24 12:39:51,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-24 12:39:51,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-24 12:39:51,186 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-24 12:39:51,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:51,187 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-24 12:39:51,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:39:51,187 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-24 12:39:51,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-24 12:39:51,188 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:51,188 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:51,188 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:51,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:51,189 INFO L82 PathProgramCache]: Analyzing trace with hash -185308931, now seen corresponding path program 50 times [2018-10-24 12:39:51,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:51,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:51,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:51,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:51,190 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:51,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:52,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:52,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:52,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:52,283 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:52,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:52,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:52,283 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:52,290 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:52,290 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:52,409 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-24 12:39:52,410 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:52,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:52,489 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:52,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:55,393 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:55,413 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:55,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-24 12:39:55,414 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:55,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:39:55,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:39:55,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5366, Invalid=6190, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:39:55,415 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 55 states. [2018-10-24 12:39:55,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:55,542 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-24 12:39:55,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:39:55,542 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 161 [2018-10-24 12:39:55,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:55,544 INFO L225 Difference]: With dead ends: 171 [2018-10-24 12:39:55,544 INFO L226 Difference]: Without dead ends: 166 [2018-10-24 12:39:55,545 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 269 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5372, Invalid=6400, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:39:55,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-24 12:39:55,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-24 12:39:55,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-24 12:39:55,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-24 12:39:55,548 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-24 12:39:55,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:55,548 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-24 12:39:55,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:39:55,548 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-24 12:39:55,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-24 12:39:55,549 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:55,549 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:55,549 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:55,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:55,550 INFO L82 PathProgramCache]: Analyzing trace with hash -866128259, now seen corresponding path program 51 times [2018-10-24 12:39:55,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:55,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:55,550 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:55,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:55,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:55,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:56,622 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:56,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:56,622 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:56,622 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:56,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:56,623 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:56,623 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:39:56,630 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:56,630 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:56,719 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:56,720 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:56,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:56,800 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:56,800 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:59,775 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:39:59,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:59,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-24 12:39:59,795 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:59,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-24 12:39:59,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-24 12:39:59,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:39:59,797 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 56 states. [2018-10-24 12:39:59,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:59,965 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-24 12:39:59,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:39:59,965 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 164 [2018-10-24 12:39:59,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:59,966 INFO L225 Difference]: With dead ends: 174 [2018-10-24 12:39:59,966 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:39:59,967 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-24 12:39:59,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:39:59,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-24 12:39:59,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-24 12:39:59,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-24 12:39:59,971 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-24 12:39:59,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:59,971 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-24 12:39:59,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-24 12:39:59,971 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-24 12:39:59,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-24 12:39:59,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:59,972 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:59,972 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:59,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:59,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1975810301, now seen corresponding path program 52 times [2018-10-24 12:39:59,972 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:59,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:59,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:59,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:59,973 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:59,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:01,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:01,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:01,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:01,354 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:01,354 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:01,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:01,354 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:01,363 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:01,363 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:01,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:01,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:01,566 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:01,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:04,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:04,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:04,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-24 12:40:04,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:04,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:40:04,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:40:04,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5788, Invalid=6644, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:40:04,840 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 57 states. [2018-10-24 12:40:05,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:05,012 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-24 12:40:05,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-24 12:40:05,013 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 167 [2018-10-24 12:40:05,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:05,014 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:40:05,014 INFO L226 Difference]: Without dead ends: 172 [2018-10-24 12:40:05,015 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 279 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5794, Invalid=6862, Unknown=0, NotChecked=0, Total=12656 [2018-10-24 12:40:05,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-24 12:40:05,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-24 12:40:05,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-24 12:40:05,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-24 12:40:05,019 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-24 12:40:05,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:05,019 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-24 12:40:05,019 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:40:05,019 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-24 12:40:05,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-24 12:40:05,020 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:05,020 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:05,020 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:05,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:05,021 INFO L82 PathProgramCache]: Analyzing trace with hash -522854787, now seen corresponding path program 53 times [2018-10-24 12:40:05,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:05,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:05,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:05,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:05,022 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:05,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:06,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:06,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:06,265 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:06,266 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:06,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:06,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:06,266 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:06,274 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:06,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:06,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-24 12:40:06,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:06,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:07,086 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:07,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:10,258 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:10,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:10,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-24 12:40:10,279 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:10,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:40:10,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:40:10,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6005, Invalid=6877, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:40:10,281 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 58 states. [2018-10-24 12:40:10,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:10,458 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-24 12:40:10,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:40:10,458 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 170 [2018-10-24 12:40:10,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:10,459 INFO L225 Difference]: With dead ends: 180 [2018-10-24 12:40:10,459 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:40:10,460 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 284 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6011, Invalid=7099, Unknown=0, NotChecked=0, Total=13110 [2018-10-24 12:40:10,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:40:10,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-24 12:40:10,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-24 12:40:10,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-24 12:40:10,464 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-24 12:40:10,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:10,464 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-24 12:40:10,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:40:10,464 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-24 12:40:10,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-24 12:40:10,465 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:10,466 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:10,466 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:10,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:10,466 INFO L82 PathProgramCache]: Analyzing trace with hash 2118682877, now seen corresponding path program 54 times [2018-10-24 12:40:10,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:10,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:10,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:10,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:10,467 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:10,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:11,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:11,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:11,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:11,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:11,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:11,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:11,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:11,707 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:11,707 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:11,794 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:11,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:11,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:11,952 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:11,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:15,193 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:15,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:15,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-24 12:40:15,213 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:15,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-24 12:40:15,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-24 12:40:15,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:40:15,214 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 59 states. [2018-10-24 12:40:15,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:15,339 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-24 12:40:15,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:40:15,340 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 173 [2018-10-24 12:40:15,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:15,340 INFO L225 Difference]: With dead ends: 183 [2018-10-24 12:40:15,341 INFO L226 Difference]: Without dead ends: 178 [2018-10-24 12:40:15,341 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 289 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-24 12:40:15,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-24 12:40:15,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-24 12:40:15,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-24 12:40:15,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-24 12:40:15,344 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-24 12:40:15,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:15,345 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-24 12:40:15,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-24 12:40:15,345 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-24 12:40:15,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:40:15,346 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:15,346 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:15,346 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:15,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:15,346 INFO L82 PathProgramCache]: Analyzing trace with hash -518533507, now seen corresponding path program 55 times [2018-10-24 12:40:15,346 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:15,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:15,347 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:15,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:15,347 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:15,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:16,656 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:16,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:16,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:16,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:16,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:16,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:16,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:16,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:16,665 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:16,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:16,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:16,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:16,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:20,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:20,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:20,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-24 12:40:20,282 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:20,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:40:20,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:40:20,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:40:20,283 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 60 states. [2018-10-24 12:40:20,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:20,468 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-24 12:40:20,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-24 12:40:20,468 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 176 [2018-10-24 12:40:20,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:20,469 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:40:20,469 INFO L226 Difference]: Without dead ends: 181 [2018-10-24 12:40:20,470 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-24 12:40:20,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-24 12:40:20,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-24 12:40:20,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-24 12:40:20,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-24 12:40:20,474 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-24 12:40:20,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:20,474 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-24 12:40:20,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:40:20,475 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-24 12:40:20,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-24 12:40:20,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:20,476 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:20,476 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:20,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:20,476 INFO L82 PathProgramCache]: Analyzing trace with hash 2004916477, now seen corresponding path program 56 times [2018-10-24 12:40:20,476 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:20,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:20,477 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:20,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:20,477 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:20,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:21,789 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:21,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:21,789 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:21,789 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:21,790 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:21,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:21,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:21,798 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:21,798 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:21,929 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-24 12:40:21,929 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:21,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:22,080 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:22,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:25,609 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:25,629 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:25,630 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-24 12:40:25,630 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:25,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:40:25,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:40:25,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6680, Invalid=7600, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:40:25,631 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 61 states. [2018-10-24 12:40:25,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:25,819 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-24 12:40:25,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:40:25,820 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 179 [2018-10-24 12:40:25,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:25,821 INFO L225 Difference]: With dead ends: 189 [2018-10-24 12:40:25,821 INFO L226 Difference]: Without dead ends: 184 [2018-10-24 12:40:25,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6686, Invalid=7834, Unknown=0, NotChecked=0, Total=14520 [2018-10-24 12:40:25,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-24 12:40:25,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-24 12:40:25,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-24 12:40:25,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-24 12:40:25,826 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-24 12:40:25,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:25,827 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-24 12:40:25,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:40:25,827 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-24 12:40:25,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-24 12:40:25,828 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:25,828 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:25,828 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:25,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:25,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1004159363, now seen corresponding path program 57 times [2018-10-24 12:40:25,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:25,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:25,829 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:25,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:25,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:25,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:27,301 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:27,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:27,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:27,301 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:27,301 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:27,301 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:27,301 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:27,309 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:27,309 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:27,396 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:27,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:27,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:27,486 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:27,487 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:31,191 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:31,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:31,214 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-24 12:40:31,214 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:31,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-24 12:40:31,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-24 12:40:31,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6913, Invalid=7849, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:40:31,216 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 62 states. [2018-10-24 12:40:31,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:31,357 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-24 12:40:31,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:40:31,357 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 182 [2018-10-24 12:40:31,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:31,358 INFO L225 Difference]: With dead ends: 192 [2018-10-24 12:40:31,358 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:40:31,359 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 304 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6919, Invalid=8087, Unknown=0, NotChecked=0, Total=15006 [2018-10-24 12:40:31,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:40:31,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-24 12:40:31,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-24 12:40:31,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-24 12:40:31,362 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-24 12:40:31,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:31,362 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-24 12:40:31,362 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-24 12:40:31,363 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-24 12:40:31,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-24 12:40:31,363 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:31,364 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:31,364 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:31,364 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:31,364 INFO L82 PathProgramCache]: Analyzing trace with hash 174893309, now seen corresponding path program 58 times [2018-10-24 12:40:31,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:31,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:31,365 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:31,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:31,365 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:31,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:32,765 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:32,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:32,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:32,765 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:32,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:32,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:32,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:32,773 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:32,774 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:32,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:32,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:32,938 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:32,938 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:36,688 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:36,709 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:36,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-24 12:40:36,709 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:36,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:40:36,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:40:36,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7150, Invalid=8102, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:40:36,711 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 63 states. [2018-10-24 12:40:36,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:36,895 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-24 12:40:36,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:40:36,895 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 185 [2018-10-24 12:40:36,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:36,896 INFO L225 Difference]: With dead ends: 195 [2018-10-24 12:40:36,897 INFO L226 Difference]: Without dead ends: 190 [2018-10-24 12:40:36,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 309 SyntacticMatches, 1 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7156, Invalid=8344, Unknown=0, NotChecked=0, Total=15500 [2018-10-24 12:40:36,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-24 12:40:36,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-24 12:40:36,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-24 12:40:36,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-24 12:40:36,900 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-24 12:40:36,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:36,901 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-24 12:40:36,901 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:40:36,901 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-24 12:40:36,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-24 12:40:36,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:36,902 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:36,902 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:36,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:36,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1090498173, now seen corresponding path program 59 times [2018-10-24 12:40:36,902 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:36,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:36,903 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:36,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:36,903 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:36,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:38,314 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:38,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:38,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:38,315 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:38,315 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:38,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:38,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:38,322 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:38,322 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:38,464 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-24 12:40:38,464 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:38,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:38,556 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:38,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:42,433 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:42,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:42,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-24 12:40:42,454 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:42,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-24 12:40:42,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-24 12:40:42,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-24 12:40:42,455 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 64 states. [2018-10-24 12:40:42,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:42,632 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-24 12:40:42,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-24 12:40:42,632 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 188 [2018-10-24 12:40:42,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:42,633 INFO L225 Difference]: With dead ends: 198 [2018-10-24 12:40:42,633 INFO L226 Difference]: Without dead ends: 193 [2018-10-24 12:40:42,634 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 314 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-24 12:40:42,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-24 12:40:42,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-24 12:40:42,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-24 12:40:42,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-24 12:40:42,638 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-24 12:40:42,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:42,638 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-24 12:40:42,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-24 12:40:42,638 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-24 12:40:42,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-24 12:40:42,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:42,639 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:42,639 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:42,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:42,639 INFO L82 PathProgramCache]: Analyzing trace with hash 537704701, now seen corresponding path program 60 times [2018-10-24 12:40:42,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:42,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:42,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:42,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:42,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:42,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:44,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:44,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:44,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:44,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:44,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:44,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:44,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:44,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:44,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:44,174 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:44,175 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:44,178 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:44,281 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:44,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:48,322 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:48,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:48,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-24 12:40:48,359 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:48,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-24 12:40:48,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-24 12:40:48,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7636, Invalid=8620, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:40:48,361 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 65 states. [2018-10-24 12:40:48,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:48,973 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-24 12:40:48,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:40:48,973 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 191 [2018-10-24 12:40:48,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:48,975 INFO L225 Difference]: With dead ends: 201 [2018-10-24 12:40:48,975 INFO L226 Difference]: Without dead ends: 196 [2018-10-24 12:40:48,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 319 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=7642, Invalid=8870, Unknown=0, NotChecked=0, Total=16512 [2018-10-24 12:40:48,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-24 12:40:48,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-24 12:40:48,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-24 12:40:48,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-24 12:40:48,980 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-24 12:40:48,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:48,980 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-24 12:40:48,980 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-24 12:40:48,980 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-24 12:40:48,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-24 12:40:48,981 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:48,981 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:48,981 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:48,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:48,982 INFO L82 PathProgramCache]: Analyzing trace with hash -828006787, now seen corresponding path program 61 times [2018-10-24 12:40:48,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:48,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:48,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:48,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:48,983 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:49,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:50,495 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:50,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:50,495 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:50,496 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:50,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:50,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:50,496 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:50,504 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:50,504 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:50,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:50,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:50,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:50,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:54,790 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:54,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:54,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-24 12:40:54,810 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:54,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:40:54,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:40:54,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7885, Invalid=8885, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:40:54,813 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 66 states. [2018-10-24 12:40:55,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:55,005 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-24 12:40:55,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-24 12:40:55,005 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 194 [2018-10-24 12:40:55,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:55,006 INFO L225 Difference]: With dead ends: 204 [2018-10-24 12:40:55,006 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:40:55,007 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=7891, Invalid=9139, Unknown=0, NotChecked=0, Total=17030 [2018-10-24 12:40:55,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:40:55,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-24 12:40:55,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-24 12:40:55,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-24 12:40:55,011 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-24 12:40:55,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:55,011 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-24 12:40:55,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:40:55,012 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-24 12:40:55,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-24 12:40:55,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:55,013 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:55,013 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:55,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:55,014 INFO L82 PathProgramCache]: Analyzing trace with hash -513750787, now seen corresponding path program 62 times [2018-10-24 12:40:55,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:55,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:55,014 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:55,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:55,015 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:55,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:57,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:57,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:57,113 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:57,113 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:57,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:57,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:57,114 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:40:57,122 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:57,123 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:57,276 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-24 12:40:57,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:57,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:57,353 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:40:57,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:01,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:01,633 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:01,633 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-24 12:41:01,633 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:01,634 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:41:01,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:41:01,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8138, Invalid=9154, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:41:01,636 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 67 states. [2018-10-24 12:41:01,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:01,859 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-24 12:41:01,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:41:01,859 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 197 [2018-10-24 12:41:01,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:01,860 INFO L225 Difference]: With dead ends: 207 [2018-10-24 12:41:01,861 INFO L226 Difference]: Without dead ends: 202 [2018-10-24 12:41:01,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 329 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2018-10-24 12:41:01,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-24 12:41:01,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-24 12:41:01,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-24 12:41:01,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-24 12:41:01,866 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-24 12:41:01,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:01,867 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-24 12:41:01,867 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:41:01,867 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-24 12:41:01,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-24 12:41:01,868 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:01,868 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:01,868 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:01,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:01,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1541960067, now seen corresponding path program 63 times [2018-10-24 12:41:01,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:01,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:01,869 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:01,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:01,870 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:01,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:03,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:03,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:03,501 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:03,501 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:03,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:03,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:03,502 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:03,512 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:41:03,512 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:41:03,605 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:41:03,605 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:03,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:03,689 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:03,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:08,094 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:08,114 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:08,114 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-24 12:41:08,114 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:08,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-24 12:41:08,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-24 12:41:08,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8395, Invalid=9427, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:41:08,116 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 68 states. [2018-10-24 12:41:08,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:08,278 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-24 12:41:08,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-24 12:41:08,279 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 200 [2018-10-24 12:41:08,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:08,280 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:41:08,280 INFO L226 Difference]: Without dead ends: 205 [2018-10-24 12:41:08,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8401, Invalid=9689, Unknown=0, NotChecked=0, Total=18090 [2018-10-24 12:41:08,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-24 12:41:08,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-24 12:41:08,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-24 12:41:08,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-24 12:41:08,284 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-24 12:41:08,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:08,284 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-24 12:41:08,284 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-24 12:41:08,284 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-24 12:41:08,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-24 12:41:08,285 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:08,286 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:08,286 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:08,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:08,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1217865475, now seen corresponding path program 64 times [2018-10-24 12:41:08,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:08,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:08,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:08,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:08,287 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:08,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:09,921 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:09,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:09,921 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:09,921 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:09,921 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:09,921 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:09,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:09,928 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:09,928 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:41:10,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:10,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:10,110 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:10,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:14,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:14,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:14,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-24 12:41:14,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:14,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:41:14,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:41:14,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8656, Invalid=9704, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:41:14,660 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 69 states. [2018-10-24 12:41:14,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:14,842 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-24 12:41:14,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:41:14,843 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 203 [2018-10-24 12:41:14,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:14,844 INFO L225 Difference]: With dead ends: 213 [2018-10-24 12:41:14,844 INFO L226 Difference]: Without dead ends: 208 [2018-10-24 12:41:14,845 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 339 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=8662, Invalid=9970, Unknown=0, NotChecked=0, Total=18632 [2018-10-24 12:41:14,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-24 12:41:14,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-24 12:41:14,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-24 12:41:14,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-24 12:41:14,848 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-24 12:41:14,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:14,848 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-24 12:41:14,848 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:41:14,848 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-24 12:41:14,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-24 12:41:14,849 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:14,850 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:14,850 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:14,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:14,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1202356611, now seen corresponding path program 65 times [2018-10-24 12:41:14,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:14,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:14,851 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:14,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:14,851 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:14,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:16,528 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:16,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:16,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:16,529 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:16,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:16,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:16,529 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:16,537 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:41:16,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:41:16,695 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-24 12:41:16,695 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:16,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:16,788 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:16,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:21,411 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:21,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:21,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-24 12:41:21,432 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:21,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:41:21,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:41:21,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8921, Invalid=9985, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:41:21,434 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 70 states. [2018-10-24 12:41:21,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:21,652 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-24 12:41:21,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:41:21,653 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 206 [2018-10-24 12:41:21,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:21,654 INFO L225 Difference]: With dead ends: 216 [2018-10-24 12:41:21,654 INFO L226 Difference]: Without dead ends: 211 [2018-10-24 12:41:21,655 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8927, Invalid=10255, Unknown=0, NotChecked=0, Total=19182 [2018-10-24 12:41:21,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-24 12:41:21,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-24 12:41:21,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-24 12:41:21,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-24 12:41:21,659 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-24 12:41:21,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:21,660 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-24 12:41:21,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:41:21,660 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-24 12:41:21,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-24 12:41:21,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:21,661 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:21,661 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:21,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:21,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1260710141, now seen corresponding path program 66 times [2018-10-24 12:41:21,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:21,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:21,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:21,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:21,663 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:21,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:23,450 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:23,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:23,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:23,450 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:23,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:23,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:23,451 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:23,458 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:41:23,459 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:41:23,561 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:41:23,561 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:23,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:23,654 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:23,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:28,510 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:28,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:28,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-24 12:41:28,530 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:28,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-24 12:41:28,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-24 12:41:28,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:41:28,532 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 71 states. [2018-10-24 12:41:28,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:28,704 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-24 12:41:28,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:41:28,705 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 209 [2018-10-24 12:41:28,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:28,706 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:41:28,706 INFO L226 Difference]: Without dead ends: 214 [2018-10-24 12:41:28,706 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 349 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-24 12:41:28,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-24 12:41:28,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-24 12:41:28,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-24 12:41:28,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-24 12:41:28,711 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-24 12:41:28,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:28,711 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-24 12:41:28,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-24 12:41:28,711 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-24 12:41:28,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-24 12:41:28,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:28,713 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:28,713 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:28,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:28,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1033933187, now seen corresponding path program 67 times [2018-10-24 12:41:28,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:28,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:28,714 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:28,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:28,714 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:28,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:30,618 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:30,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:30,618 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:30,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:30,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:30,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:30,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:30,627 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:30,627 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:41:30,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:30,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:30,821 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:30,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:35,799 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:35,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:35,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-24 12:41:35,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:35,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-24 12:41:35,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-24 12:41:35,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-24 12:41:35,821 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 72 states. [2018-10-24 12:41:36,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:36,052 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-24 12:41:36,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-24 12:41:36,052 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 212 [2018-10-24 12:41:36,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:36,053 INFO L225 Difference]: With dead ends: 222 [2018-10-24 12:41:36,053 INFO L226 Difference]: Without dead ends: 217 [2018-10-24 12:41:36,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 354 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-24 12:41:36,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-24 12:41:36,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-24 12:41:36,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-24 12:41:36,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-24 12:41:36,058 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-24 12:41:36,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:36,059 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-24 12:41:36,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-24 12:41:36,059 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-24 12:41:36,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-24 12:41:36,060 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:36,060 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:36,061 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:36,061 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:36,061 INFO L82 PathProgramCache]: Analyzing trace with hash -2053834499, now seen corresponding path program 68 times [2018-10-24 12:41:36,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:36,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:36,062 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:36,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:36,062 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:36,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:37,890 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:37,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:37,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:37,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:37,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:37,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:37,891 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:37,898 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:41:37,899 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:41:38,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-24 12:41:38,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:38,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:38,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:38,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:43,214 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:43,234 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:43,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 144 [2018-10-24 12:41:43,234 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:43,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-24 12:41:43,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-24 12:41:43,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9740, Invalid=10852, Unknown=0, NotChecked=0, Total=20592 [2018-10-24 12:41:43,236 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 73 states. [2018-10-24 12:41:43,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:43,439 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-24 12:41:43,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:41:43,439 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 215 [2018-10-24 12:41:43,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:43,440 INFO L225 Difference]: With dead ends: 225 [2018-10-24 12:41:43,440 INFO L226 Difference]: Without dead ends: 220 [2018-10-24 12:41:43,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=9746, Invalid=11134, Unknown=0, NotChecked=0, Total=20880 [2018-10-24 12:41:43,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-24 12:41:43,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-24 12:41:43,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-24 12:41:43,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-24 12:41:43,444 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-24 12:41:43,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:43,444 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-24 12:41:43,444 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-24 12:41:43,445 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-24 12:41:43,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-24 12:41:43,445 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:43,445 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:43,446 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:43,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:43,446 INFO L82 PathProgramCache]: Analyzing trace with hash 959798909, now seen corresponding path program 69 times [2018-10-24 12:41:43,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:43,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:43,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:43,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:43,447 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:43,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:45,281 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:45,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:45,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:45,281 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:45,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:45,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:45,282 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:41:45,306 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:41:45,306 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:41:45,417 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:41:45,417 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:45,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:45,495 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:45,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:50,673 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:50,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:50,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-24 12:41:50,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:50,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-10-24 12:41:50,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-10-24 12:41:50,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10021, Invalid=11149, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:41:50,696 INFO L87 Difference]: Start difference. First operand 219 states and 219 transitions. Second operand 74 states. [2018-10-24 12:41:50,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:50,949 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-24 12:41:50,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-10-24 12:41:50,950 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 218 [2018-10-24 12:41:50,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:50,951 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:41:50,951 INFO L226 Difference]: Without dead ends: 223 [2018-10-24 12:41:50,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 364 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=10027, Invalid=11435, Unknown=0, NotChecked=0, Total=21462 [2018-10-24 12:41:50,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-24 12:41:50,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-24 12:41:50,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-24 12:41:50,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 222 transitions. [2018-10-24 12:41:50,955 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 222 transitions. Word has length 218 [2018-10-24 12:41:50,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:50,955 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 222 transitions. [2018-10-24 12:41:50,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-10-24 12:41:50,955 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 222 transitions. [2018-10-24 12:41:50,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-24 12:41:50,956 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:50,956 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:50,956 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:50,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:50,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1883698947, now seen corresponding path program 70 times [2018-10-24 12:41:50,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:50,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:50,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:50,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:50,957 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:51,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-24 12:41:51,831 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:41:51,835 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:41:51,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:41:51 BoogieIcfgContainer [2018-10-24 12:41:51,835 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:41:51,836 INFO L168 Benchmark]: Toolchain (without parser) took 230891.06 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 851.4 MB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -550.4 MB). Peak memory consumption was 301.0 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:51,837 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:41:51,838 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.02 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:51,838 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.01 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:41:51,838 INFO L168 Benchmark]: Boogie Preprocessor took 30.88 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:41:51,838 INFO L168 Benchmark]: RCFGBuilder took 354.41 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 771.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -832.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:51,839 INFO L168 Benchmark]: TraceAbstraction took 230175.78 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 80.2 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 271.6 MB). Peak memory consumption was 351.8 MB. Max. memory is 7.1 GB. [2018-10-24 12:41:51,841 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 302.02 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 23.01 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.88 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 354.41 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 771.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -832.6 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230175.78 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 80.2 MB). Free memory was 2.2 GB in the beginning and 2.0 GB in the end (delta: 271.6 MB). Peak memory consumption was 351.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 222 with TraceHistMax 71,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 49 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 230.0s OverallTime, 72 OverallIterations, 71 TraceHistogramMax, 11.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 791 SDtfs, 2553 SDslu, 19636 SDs, 0 SdLazy, 4698 SolverSat, 111 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18770 GetRequests, 13393 SyntacticMatches, 70 SemanticMatches, 5307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19517 ImplicationChecksByTransitivity, 203.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=222occurred in iteration=71, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 71 MinimizatonAttempts, 69 StatesRemovedByMinimization, 69 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 5.7s SatisfiabilityAnalysisTime, 207.0s InterpolantComputationTime, 16029 NumberOfCodeBlocks, 16029 NumberOfCodeBlocksAsserted, 968 NumberOfCheckSat, 23824 ConstructedInterpolants, 0 QuantifiedInterpolants, 10207476 SizeOfPredicates, 139 NumberOfNonLiveVariables, 30705 ConjunctsInSsa, 2894 ConjunctsInUnsatCore, 209 InterpolantComputations, 2 PerfectInterpolantSequences, 0/507150 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown