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-acceleration/array_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:08:03,895 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:08:03,901 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:08:03,915 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:08:03,915 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:08:03,916 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:08:03,918 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:08:03,919 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:08:03,921 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:08:03,922 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:08:03,923 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:08:03,923 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:08:03,924 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:08:03,925 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:08:03,926 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:08:03,927 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:08:03,928 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:08:03,930 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:08:03,932 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:08:03,933 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:08:03,934 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:08:03,935 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:08:03,938 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:08:03,938 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:08:03,938 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:08:03,939 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:08:03,940 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:08:03,941 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:08:03,942 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:08:03,943 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:08:03,943 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:08:03,944 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 09:08:03,946 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 [2018-10-27 09:08:03,962 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:08:03,962 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:08:03,963 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:08:03,963 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:08:03,963 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:08:03,964 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:08:03,964 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:08:03,964 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:08:03,964 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:08:03,964 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:08:03,965 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:08:03,965 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:08:03,965 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:08:03,965 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:08:03,966 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:08:03,966 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:08:03,966 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:08:03,966 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:08:03,967 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:08:03,967 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:08:03,967 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:08:03,967 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:08:03,967 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:08:03,968 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:08:03,968 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:08:03,968 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:08:03,968 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:08:03,968 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:08:03,969 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:08:03,969 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:08:03,969 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:08:03,969 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:08:03,969 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:08:03,969 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:08:03,970 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:08:03,970 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:08:04,012 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:08:04,025 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:08:04,029 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:08:04,031 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:08:04,031 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:08:04,032 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-27 09:08:04,106 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9731ab5e5/8008bb9ae6474271a8d42e124853dea9/FLAGf762846ba [2018-10-27 09:08:04,556 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:08:04,556 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-27 09:08:04,567 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9731ab5e5/8008bb9ae6474271a8d42e124853dea9/FLAGf762846ba [2018-10-27 09:08:04,580 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9731ab5e5/8008bb9ae6474271a8d42e124853dea9 [2018-10-27 09:08:04,591 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:08:04,592 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:08:04,593 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:08:04,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:08:04,597 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:08:04,598 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,601 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a6628d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04, skipping insertion in model container [2018-10-27 09:08:04,602 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,612 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:08:04,633 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:08:04,817 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:08:04,823 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:08:04,851 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:08:04,882 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:08:04,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04 WrapperNode [2018-10-27 09:08:04,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:08:04,884 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:08:04,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:08:04,884 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:08:04,894 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,905 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,925 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:08:04,926 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:08:04,926 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:08:04,926 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:08:04,934 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,936 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,936 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,942 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,947 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,948 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (1/1) ... [2018-10-27 09:08:04,950 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:08:04,951 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:08:04,951 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:08:04,951 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:08:04,952 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (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 [2018-10-27 09:08:05,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:08:05,074 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:08:05,074 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:08:05,074 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:08:05,075 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:08:05,075 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:08:05,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:08:05,075 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:08:05,414 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:08:05,415 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:08:05 BoogieIcfgContainer [2018-10-27 09:08:05,415 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:08:05,416 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:08:05,416 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:08:05,419 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:08:05,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:08:04" (1/3) ... [2018-10-27 09:08:05,420 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3213cede and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:08:05, skipping insertion in model container [2018-10-27 09:08:05,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:08:04" (2/3) ... [2018-10-27 09:08:05,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3213cede and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:08:05, skipping insertion in model container [2018-10-27 09:08:05,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:08:05" (3/3) ... [2018-10-27 09:08:05,423 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call2_true-termination.i [2018-10-27 09:08:05,432 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:08:05,440 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:08:05,457 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:08:05,491 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:08:05,491 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:08:05,491 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:08:05,491 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:08:05,491 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:08:05,491 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:08:05,492 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:08:05,492 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:08:05,508 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-27 09:08:05,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-27 09:08:05,514 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:05,515 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:05,517 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:05,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:05,524 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-27 09:08:05,526 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:05,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,584 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:05,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,584 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:05,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:05,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:05,682 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:08:05,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:08:05,682 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:08:05,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:08:05,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:08:05,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:08:05,703 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-27 09:08:05,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:05,727 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-27 09:08:05,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:08:05,729 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-27 09:08:05,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:05,738 INFO L225 Difference]: With dead ends: 35 [2018-10-27 09:08:05,738 INFO L226 Difference]: Without dead ends: 15 [2018-10-27 09:08:05,742 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 [2018-10-27 09:08:05,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-27 09:08:05,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-27 09:08:05,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 09:08:05,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-27 09:08:05,783 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-27 09:08:05,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:05,784 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-27 09:08:05,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:08:05,784 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-27 09:08:05,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 09:08:05,785 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:05,785 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:05,785 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:05,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:05,786 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-27 09:08:05,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:05,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:05,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,788 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:05,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:05,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:05,874 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:08:05,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:08:05,874 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:08:05,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:08:05,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:08:05,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:08:05,878 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-27 09:08:05,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:05,950 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-27 09:08:05,951 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:08:05,951 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-27 09:08:05,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:05,952 INFO L225 Difference]: With dead ends: 24 [2018-10-27 09:08:05,952 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 09:08:05,953 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 [2018-10-27 09:08:05,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 09:08:05,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-27 09:08:05,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-27 09:08:05,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-27 09:08:05,958 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-27 09:08:05,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:05,958 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-27 09:08:05,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:08:05,959 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-27 09:08:05,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-27 09:08:05,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:05,960 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:05,960 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:05,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:05,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-27 09:08:05,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:05,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,962 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:05,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,962 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:05,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:06,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:06,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:06,070 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-27 09:08:06,072 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-27 09:08:06,115 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:08:06,115 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:08:06,314 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:08:06,316 INFO L272 AbstractInterpreter]: Visited 15 different actions 23 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-27 09:08:06,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:06,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:08:06,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:06,338 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 [2018-10-27 09:08:06,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:06,349 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:06,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:06,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:06,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:06,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,595 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:06,596 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-27 09:08:06,596 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:06,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:08:06,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:08:06,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:08:06,597 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-27 09:08:06,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:06,717 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 09:08:06,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:08:06,718 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-27 09:08:06,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:06,718 INFO L225 Difference]: With dead ends: 27 [2018-10-27 09:08:06,719 INFO L226 Difference]: Without dead ends: 21 [2018-10-27 09:08:06,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:08:06,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-27 09:08:06,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-27 09:08:06,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 09:08:06,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 09:08:06,724 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-27 09:08:06,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:06,725 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 09:08:06,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:08:06,725 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 09:08:06,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 09:08:06,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:06,726 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:06,726 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:06,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:06,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-27 09:08:06,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:06,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:06,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:06,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:06,729 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:06,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:06,856 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:06,857 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:06,857 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:06,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:06,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:06,857 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 [2018-10-27 09:08:06,875 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:06,876 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:06,935 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:08:06,935 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:06,938 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:06,989 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:07,263 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:07,284 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:07,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 09:08:07,284 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:07,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:08:07,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:08:07,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:08:07,286 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-27 09:08:07,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:07,344 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-27 09:08:07,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:08:07,345 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-27 09:08:07,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:07,345 INFO L225 Difference]: With dead ends: 30 [2018-10-27 09:08:07,345 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 09:08:07,346 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:08:07,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 09:08:07,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-27 09:08:07,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-27 09:08:07,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-27 09:08:07,351 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-27 09:08:07,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:07,351 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-27 09:08:07,351 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:08:07,352 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-27 09:08:07,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-27 09:08:07,353 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:07,353 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:07,353 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:07,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:07,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-27 09:08:07,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:07,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:07,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,355 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:07,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:07,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:07,496 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:07,496 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:07,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:07,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:07,497 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 [2018-10-27 09:08:07,511 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:07,511 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:07,559 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:07,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:07,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:07,581 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:07,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:07,700 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:07,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:07,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-27 09:08:07,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:07,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:08:07,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:08:07,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:08:07,728 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-27 09:08:07,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:07,771 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 09:08:07,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 09:08:07,772 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-27 09:08:07,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:07,773 INFO L225 Difference]: With dead ends: 33 [2018-10-27 09:08:07,773 INFO L226 Difference]: Without dead ends: 27 [2018-10-27 09:08:07,774 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:08:07,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-27 09:08:07,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-27 09:08:07,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 09:08:07,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 09:08:07,779 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-27 09:08:07,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:07,780 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 09:08:07,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:08:07,780 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 09:08:07,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 09:08:07,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:07,781 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:07,782 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:07,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:07,782 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-27 09:08:07,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:07,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:07,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,783 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:07,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:08,050 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:08,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:08,051 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:08,052 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:08,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:08,052 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 [2018-10-27 09:08:08,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:08,075 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:08,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:08,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:08,236 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:08,443 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:08,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 09:08:08,465 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:08,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:08:08,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:08:08,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:08:08,466 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-27 09:08:08,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:08,523 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-27 09:08:08,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:08:08,525 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-27 09:08:08,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:08,527 INFO L225 Difference]: With dead ends: 36 [2018-10-27 09:08:08,527 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 09:08:08,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:08:08,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 09:08:08,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-27 09:08:08,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-27 09:08:08,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-27 09:08:08,534 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-27 09:08:08,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:08,534 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-27 09:08:08,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:08:08,534 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-27 09:08:08,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-27 09:08:08,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:08,535 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:08,536 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:08,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:08,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-27 09:08:08,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:08,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:08,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:08,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:08,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:08,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:08,708 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:08,709 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:08,709 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:08,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:08,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:08,709 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) [2018-10-27 09:08:08,725 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:08,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:08,818 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:08:08,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:08,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:08,859 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:09,028 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,050 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:09,050 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 09:08:09,050 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:09,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:08:09,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:08:09,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:08:09,051 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-27 09:08:09,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:09,111 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 09:08:09,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:08:09,111 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-27 09:08:09,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:09,113 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:08:09,113 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 09:08:09,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:08:09,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 09:08:09,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-27 09:08:09,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 09:08:09,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 09:08:09,119 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-27 09:08:09,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:09,120 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 09:08:09,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:08:09,120 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 09:08:09,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 09:08:09,121 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:09,121 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:09,121 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:09,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:09,122 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-27 09:08:09,122 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:09,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:09,123 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:09,123 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:09,123 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:09,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:09,377 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,378 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:09,378 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:09,379 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:09,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,379 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 [2018-10-27 09:08:09,389 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:09,389 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:09,452 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:09,452 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:09,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:09,503 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:09,734 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:09,754 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:09,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-10-27 09:08:09,755 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:09,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:08:09,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:08:09,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:08:09,756 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-27 09:08:09,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:09,811 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-27 09:08:09,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:08:09,813 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-27 09:08:09,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:09,814 INFO L225 Difference]: With dead ends: 42 [2018-10-27 09:08:09,814 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 09:08:09,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:08:09,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 09:08:09,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-27 09:08:09,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-27 09:08:09,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-27 09:08:09,822 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-27 09:08:09,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:09,823 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-27 09:08:09,823 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:08:09,823 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-27 09:08:09,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-27 09:08:09,824 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:09,824 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:09,824 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:09,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:09,825 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-27 09:08:09,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:09,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:09,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:09,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:09,826 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:09,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:10,082 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:10,082 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:10,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:10,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:10,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:10,083 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 [2018-10-27 09:08:10,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:10,091 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:10,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:10,133 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:10,149 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:10,357 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,379 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:10,380 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 09:08:10,380 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:10,381 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:08:10,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:08:10,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:08:10,382 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-27 09:08:10,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:10,443 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 09:08:10,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:08:10,445 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-27 09:08:10,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:10,447 INFO L225 Difference]: With dead ends: 45 [2018-10-27 09:08:10,447 INFO L226 Difference]: Without dead ends: 39 [2018-10-27 09:08:10,447 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:08:10,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-27 09:08:10,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-27 09:08:10,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 09:08:10,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 09:08:10,453 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-27 09:08:10,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:10,453 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 09:08:10,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:08:10,453 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 09:08:10,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 09:08:10,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:10,455 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:10,455 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:10,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:10,455 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-27 09:08:10,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:10,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:10,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:10,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:10,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:10,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:10,741 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:10,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:10,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:10,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:10,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:10,743 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 [2018-10-27 09:08:10,752 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:10,753 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:10,868 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:08:10,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:10,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:10,923 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:10,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:11,299 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:11,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:11,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 09:08:11,321 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:11,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:08:11,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:08:11,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:08:11,322 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-27 09:08:11,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:11,452 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-27 09:08:11,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:08:11,454 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-27 09:08:11,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:11,455 INFO L225 Difference]: With dead ends: 48 [2018-10-27 09:08:11,456 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 09:08:11,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:08:11,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 09:08:11,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-27 09:08:11,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-27 09:08:11,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-27 09:08:11,463 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-27 09:08:11,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:11,463 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-27 09:08:11,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:08:11,463 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-27 09:08:11,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-27 09:08:11,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:11,465 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:11,466 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:11,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:11,466 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-27 09:08:11,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:11,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:11,467 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:11,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:11,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:11,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:11,716 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:11,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:11,716 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:11,716 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:11,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:11,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:11,717 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 [2018-10-27 09:08:11,724 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:11,724 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:11,787 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:11,787 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:11,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:11,842 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:11,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:12,220 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:12,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:12,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-10-27 09:08:12,241 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:12,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:08:12,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:08:12,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:08:12,243 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-27 09:08:12,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:12,303 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 09:08:12,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 09:08:12,304 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-27 09:08:12,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:12,306 INFO L225 Difference]: With dead ends: 51 [2018-10-27 09:08:12,306 INFO L226 Difference]: Without dead ends: 45 [2018-10-27 09:08:12,306 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:08:12,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-27 09:08:12,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-27 09:08:12,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 09:08:12,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 09:08:12,311 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-27 09:08:12,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:12,312 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 09:08:12,312 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:08:12,312 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 09:08:12,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 09:08:12,313 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:12,313 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:12,313 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:12,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:12,314 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-27 09:08:12,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:12,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:12,315 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:12,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:12,315 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:12,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:13,187 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:13,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:13,188 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:13,188 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:13,188 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:13,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:13,189 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 [2018-10-27 09:08:13,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:13,209 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:13,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:13,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:13,329 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:13,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:13,600 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:13,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:13,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 09:08:13,625 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:13,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:08:13,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:08:13,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:08:13,626 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-27 09:08:13,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:13,688 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-27 09:08:13,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:08:13,690 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-27 09:08:13,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:13,691 INFO L225 Difference]: With dead ends: 54 [2018-10-27 09:08:13,692 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 09:08:13,693 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:08:13,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 09:08:13,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-27 09:08:13,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-27 09:08:13,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-27 09:08:13,698 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-27 09:08:13,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:13,698 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-27 09:08:13,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:08:13,699 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-27 09:08:13,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-27 09:08:13,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:13,700 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:13,700 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:13,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:13,700 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-27 09:08:13,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:13,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:13,702 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:13,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:13,702 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:13,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:14,064 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:14,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:14,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:14,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:14,065 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:14,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:14,065 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 [2018-10-27 09:08:14,076 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:14,076 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:14,254 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:08:14,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:14,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:14,290 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:14,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:14,566 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:14,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:14,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 09:08:14,599 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:14,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:08:14,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:08:14,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:08:14,600 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-27 09:08:14,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:14,776 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 09:08:14,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:08:14,776 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-27 09:08:14,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:14,778 INFO L225 Difference]: With dead ends: 57 [2018-10-27 09:08:14,778 INFO L226 Difference]: Without dead ends: 51 [2018-10-27 09:08:14,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:08:14,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-27 09:08:14,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-27 09:08:14,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 09:08:14,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 09:08:14,784 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-27 09:08:14,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:14,785 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 09:08:14,785 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:08:14,785 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 09:08:14,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 09:08:14,786 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:14,786 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:14,786 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:14,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:14,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-27 09:08:14,787 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:14,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:14,788 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:14,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:14,788 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:14,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:15,165 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:15,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:15,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:15,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:15,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:15,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:15,166 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 [2018-10-27 09:08:15,176 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:15,176 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:15,231 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:15,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:15,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:15,261 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:15,261 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:15,518 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:15,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:15,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-10-27 09:08:15,540 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:15,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 09:08:15,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 09:08:15,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:08:15,541 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-27 09:08:15,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:15,640 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-27 09:08:15,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:08:15,641 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-27 09:08:15,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:15,642 INFO L225 Difference]: With dead ends: 60 [2018-10-27 09:08:15,642 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 09:08:15,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:08:15,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 09:08:15,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-27 09:08:15,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-27 09:08:15,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-27 09:08:15,648 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-27 09:08:15,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:15,649 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-27 09:08:15,649 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 09:08:15,649 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-27 09:08:15,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-27 09:08:15,650 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:15,650 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:15,650 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:15,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:15,651 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-27 09:08:15,651 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:15,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:15,652 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:15,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:15,652 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:15,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:15,878 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:15,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:15,879 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:15,879 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:15,879 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:15,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:15,879 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 [2018-10-27 09:08:15,888 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:15,888 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:15,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:15,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:16,065 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:16,065 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:16,667 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:16,689 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:16,689 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 09:08:16,689 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:16,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:08:16,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:08:16,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:08:16,690 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-27 09:08:16,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:16,778 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 09:08:16,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:08:16,779 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-27 09:08:16,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:16,780 INFO L225 Difference]: With dead ends: 63 [2018-10-27 09:08:16,780 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 09:08:16,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:08:16,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 09:08:16,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-27 09:08:16,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 09:08:16,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 09:08:16,786 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-27 09:08:16,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:16,787 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 09:08:16,787 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:08:16,787 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 09:08:16,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 09:08:16,788 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:16,788 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:16,788 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:16,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:16,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-27 09:08:16,789 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:16,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:16,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:16,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:16,790 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:16,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:17,072 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:17,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:17,072 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:17,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:17,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:17,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:17,073 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 [2018-10-27 09:08:17,080 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:17,080 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:17,412 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 09:08:17,412 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:17,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:17,436 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:17,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:17,958 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:17,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:17,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 09:08:17,980 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:17,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:08:17,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:08:17,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:08:17,981 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-27 09:08:18,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:18,093 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-27 09:08:18,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:08:18,094 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-27 09:08:18,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:18,095 INFO L225 Difference]: With dead ends: 66 [2018-10-27 09:08:18,095 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 09:08:18,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:08:18,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 09:08:18,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-27 09:08:18,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-27 09:08:18,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-27 09:08:18,102 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-27 09:08:18,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:18,103 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-27 09:08:18,103 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:08:18,103 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-27 09:08:18,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-27 09:08:18,104 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:18,104 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:18,105 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:18,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:18,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-27 09:08:18,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:18,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:18,106 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:18,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:18,106 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:18,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:18,374 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:18,374 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:18,374 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:18,374 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:18,375 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:18,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:18,375 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 [2018-10-27 09:08:18,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:18,383 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:18,453 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:18,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:18,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:18,494 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:18,494 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:19,499 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:19,499 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-10-27 09:08:19,500 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:19,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:08:19,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:08:19,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:08:19,501 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-27 09:08:19,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:19,567 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 09:08:19,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 09:08:19,572 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-27 09:08:19,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:19,573 INFO L225 Difference]: With dead ends: 69 [2018-10-27 09:08:19,573 INFO L226 Difference]: Without dead ends: 63 [2018-10-27 09:08:19,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:08:19,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-27 09:08:19,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-27 09:08:19,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-27 09:08:19,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-27 09:08:19,578 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-27 09:08:19,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:19,578 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-27 09:08:19,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:08:19,578 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-27 09:08:19,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-27 09:08:19,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:19,580 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:19,580 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:19,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:19,580 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-27 09:08:19,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:19,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:19,581 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:19,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:19,581 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:19,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:19,971 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:19,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:19,971 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:19,972 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:19,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:19,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:19,972 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 [2018-10-27 09:08:19,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:19,980 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:20,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:20,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:20,096 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:20,096 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:21,083 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:21,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:21,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 09:08:21,111 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:21,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:08:21,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:08:21,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:08:21,113 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-27 09:08:21,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:21,417 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-27 09:08:21,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:08:21,418 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-27 09:08:21,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:21,418 INFO L225 Difference]: With dead ends: 72 [2018-10-27 09:08:21,418 INFO L226 Difference]: Without dead ends: 66 [2018-10-27 09:08:21,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:08:21,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-27 09:08:21,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-27 09:08:21,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-27 09:08:21,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-27 09:08:21,424 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-27 09:08:21,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:21,425 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-27 09:08:21,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:08:21,425 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-27 09:08:21,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-27 09:08:21,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:21,426 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:21,426 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:21,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:21,426 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-27 09:08:21,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:21,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:21,427 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:21,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:21,427 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:21,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:22,205 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:22,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:22,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:22,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:22,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:22,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:22,206 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 [2018-10-27 09:08:22,214 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:22,215 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:22,794 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 09:08:22,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:22,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:22,829 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:22,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:23,275 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:23,296 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:23,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 09:08:23,296 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:23,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:08:23,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:08:23,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:08:23,298 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-27 09:08:23,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:23,409 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 09:08:23,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:08:23,409 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-27 09:08:23,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:23,410 INFO L225 Difference]: With dead ends: 75 [2018-10-27 09:08:23,411 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 09:08:23,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:08:23,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 09:08:23,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-27 09:08:23,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-27 09:08:23,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-27 09:08:23,417 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-27 09:08:23,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:23,417 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-27 09:08:23,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:08:23,418 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-27 09:08:23,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-27 09:08:23,419 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:23,419 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:23,419 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:23,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:23,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-27 09:08:23,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:23,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:23,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:23,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:23,420 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:23,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:24,101 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:24,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:24,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:24,101 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:24,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:24,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:24,102 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 [2018-10-27 09:08:24,110 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:24,110 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:24,191 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:24,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:24,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:24,211 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:24,211 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:24,680 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:24,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:24,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-10-27 09:08:24,702 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:24,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:08:24,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:08:24,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:08:24,703 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-27 09:08:24,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:24,788 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-27 09:08:24,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:08:24,789 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-27 09:08:24,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:24,790 INFO L225 Difference]: With dead ends: 78 [2018-10-27 09:08:24,790 INFO L226 Difference]: Without dead ends: 72 [2018-10-27 09:08:24,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:08:24,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-27 09:08:24,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-27 09:08:24,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-27 09:08:24,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-27 09:08:24,795 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-27 09:08:24,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:24,795 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-27 09:08:24,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:08:24,795 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-27 09:08:24,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-27 09:08:24,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:24,796 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:24,796 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:24,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:24,796 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-27 09:08:24,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:24,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:24,797 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:24,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:24,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:24,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:25,066 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:25,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:25,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:25,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:25,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:25,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:25,067 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 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 [2018-10-27 09:08:25,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:25,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:25,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:25,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:25,189 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:25,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:25,687 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:25,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:25,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 09:08:25,710 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:25,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:08:25,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:08:25,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:08:25,712 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-27 09:08:25,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:25,812 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 09:08:25,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:08:25,813 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-27 09:08:25,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:25,814 INFO L225 Difference]: With dead ends: 81 [2018-10-27 09:08:25,814 INFO L226 Difference]: Without dead ends: 75 [2018-10-27 09:08:25,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:08:25,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-27 09:08:25,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-27 09:08:25,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-27 09:08:25,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-27 09:08:25,819 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-27 09:08:25,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:25,820 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-27 09:08:25,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:08:25,820 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-27 09:08:25,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-27 09:08:25,821 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:25,821 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:25,821 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:25,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:25,822 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-27 09:08:25,822 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:25,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:25,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:25,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:25,823 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:25,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:26,160 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:26,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:26,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:26,161 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:26,161 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:26,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:26,161 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 [2018-10-27 09:08:26,168 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:26,169 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:27,874 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 09:08:27,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:27,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:27,899 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:27,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:28,725 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:28,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:28,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 09:08:28,747 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:28,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:08:28,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:08:28,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:08:28,749 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-27 09:08:28,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:28,926 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-27 09:08:28,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:08:28,930 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-27 09:08:28,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:28,931 INFO L225 Difference]: With dead ends: 84 [2018-10-27 09:08:28,931 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 09:08:28,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:08:28,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 09:08:28,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-27 09:08:28,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 09:08:28,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-27 09:08:28,936 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-27 09:08:28,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:28,936 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-27 09:08:28,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:08:28,936 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-27 09:08:28,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-27 09:08:28,937 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:28,937 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:28,937 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:28,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:28,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-27 09:08:28,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:28,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:28,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:28,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:28,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:28,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:29,279 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:29,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:29,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:29,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:29,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:29,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:29,280 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 [2018-10-27 09:08:29,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:29,287 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:29,368 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:29,368 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:29,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:29,392 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:29,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:29,983 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:30,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:30,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-10-27 09:08:30,005 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:30,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:08:30,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:08:30,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:08:30,006 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-27 09:08:30,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:30,090 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-27 09:08:30,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 09:08:30,092 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-27 09:08:30,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:30,093 INFO L225 Difference]: With dead ends: 87 [2018-10-27 09:08:30,093 INFO L226 Difference]: Without dead ends: 81 [2018-10-27 09:08:30,094 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:08:30,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-27 09:08:30,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-27 09:08:30,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-27 09:08:30,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-27 09:08:30,096 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-27 09:08:30,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:30,096 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-27 09:08:30,097 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:08:30,097 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-27 09:08:30,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-27 09:08:30,098 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:30,098 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:30,098 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:30,098 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:30,098 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-27 09:08:30,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:30,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:30,099 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:30,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:30,099 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:30,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:30,783 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:30,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:30,783 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:30,783 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:30,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:30,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:30,784 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 [2018-10-27 09:08:30,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:30,792 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:30,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:30,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:30,943 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:30,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:31,742 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:31,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:31,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 09:08:31,763 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:31,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 09:08:31,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 09:08:31,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:08:31,764 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-27 09:08:31,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:31,902 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-27 09:08:31,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:08:31,902 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-27 09:08:31,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:31,903 INFO L225 Difference]: With dead ends: 90 [2018-10-27 09:08:31,904 INFO L226 Difference]: Without dead ends: 84 [2018-10-27 09:08:31,905 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:08:31,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-27 09:08:31,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-27 09:08:31,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-27 09:08:31,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-27 09:08:31,909 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-27 09:08:31,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:31,909 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-27 09:08:31,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 09:08:31,909 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-27 09:08:31,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-27 09:08:31,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:31,910 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:31,910 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:31,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:31,911 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-27 09:08:31,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:31,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:31,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:31,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:31,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:32,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:32,653 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:32,653 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:32,653 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:32,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:32,653 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 [2018-10-27 09:08:32,661 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:32,661 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:43,472 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 09:08:43,472 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:43,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:43,499 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:43,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:44,204 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:44,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:44,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 09:08:44,229 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:44,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:08:44,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:08:44,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:08:44,230 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-27 09:08:44,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:44,337 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-27 09:08:44,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:08:44,338 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-27 09:08:44,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:44,338 INFO L225 Difference]: With dead ends: 93 [2018-10-27 09:08:44,338 INFO L226 Difference]: Without dead ends: 87 [2018-10-27 09:08:44,339 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:08:44,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-27 09:08:44,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-27 09:08:44,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-27 09:08:44,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-27 09:08:44,342 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-27 09:08:44,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:44,343 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-27 09:08:44,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:08:44,343 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-27 09:08:44,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-27 09:08:44,344 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:44,344 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:44,344 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:44,344 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:44,344 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-27 09:08:44,344 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:44,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:44,345 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:44,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:44,345 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:44,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:44,811 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:44,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:44,812 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:44,812 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:44,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:44,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:44,812 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 [2018-10-27 09:08:44,819 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:44,819 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:44,909 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:44,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:44,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:44,971 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:44,972 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:45,764 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:45,785 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:45,785 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-10-27 09:08:45,785 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:45,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 09:08:45,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 09:08:45,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 09:08:45,787 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-27 09:08:45,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:45,918 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-27 09:08:45,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 09:08:45,919 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-27 09:08:45,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:45,920 INFO L225 Difference]: With dead ends: 96 [2018-10-27 09:08:45,920 INFO L226 Difference]: Without dead ends: 90 [2018-10-27 09:08:45,921 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 09:08:45,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-27 09:08:45,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-27 09:08:45,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-27 09:08:45,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-27 09:08:45,924 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-27 09:08:45,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:45,924 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-27 09:08:45,924 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 09:08:45,924 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-27 09:08:45,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-27 09:08:45,925 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:45,925 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:45,925 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:45,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:45,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-27 09:08:45,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:45,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:45,927 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:45,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:45,927 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:45,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:47,250 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:47,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:47,251 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:47,251 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:47,251 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:47,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:47,252 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 [2018-10-27 09:08:47,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:47,259 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:47,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:47,392 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:47,393 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:48,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:48,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 09:08:48,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:48,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:08:48,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:08:48,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:08:48,661 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-27 09:08:48,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:48,764 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-27 09:08:48,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:08:48,764 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-27 09:08:48,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:48,766 INFO L225 Difference]: With dead ends: 99 [2018-10-27 09:08:48,766 INFO L226 Difference]: Without dead ends: 93 [2018-10-27 09:08:48,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:08:48,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-27 09:08:48,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-27 09:08:48,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-27 09:08:48,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-27 09:08:48,771 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-27 09:08:48,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:48,772 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-27 09:08:48,772 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:08:48,772 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-27 09:08:48,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-27 09:08:48,773 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:48,773 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:48,773 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:48,773 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:48,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-27 09:08:48,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:48,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:48,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:48,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:48,774 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:48,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:49,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:49,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:49,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:49,222 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:49,222 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:49,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:49,222 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 [2018-10-27 09:08:49,229 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:49,229 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:58,314 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 09:08:58,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:58,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:58,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:58,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:59,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:59,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:59,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 09:08:59,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:59,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:08:59,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:08:59,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:08:59,374 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-27 09:08:59,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:59,497 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-27 09:08:59,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:08:59,497 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-27 09:08:59,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:59,499 INFO L225 Difference]: With dead ends: 102 [2018-10-27 09:08:59,499 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 09:08:59,501 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:08:59,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 09:08:59,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-27 09:08:59,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-27 09:08:59,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-27 09:08:59,505 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-27 09:08:59,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:59,505 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-27 09:08:59,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:08:59,506 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-27 09:08:59,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-27 09:08:59,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:59,506 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:59,507 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:59,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:59,507 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-27 09:08:59,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:59,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:59,508 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:59,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:59,508 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:59,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:00,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:00,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:00,847 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:00,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:00,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:00,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:00,848 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 [2018-10-27 09:09:00,856 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:09:00,856 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:09:00,960 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:09:00,961 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:00,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:00,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:00,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:01,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:01,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:01,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-10-27 09:09:01,998 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:01,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:09:01,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:09:01,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:09:02,000 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-27 09:09:02,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:02,136 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-27 09:09:02,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 09:09:02,138 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-27 09:09:02,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:02,139 INFO L225 Difference]: With dead ends: 105 [2018-10-27 09:09:02,139 INFO L226 Difference]: Without dead ends: 99 [2018-10-27 09:09:02,140 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:09:02,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-27 09:09:02,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-27 09:09:02,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-27 09:09:02,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-27 09:09:02,144 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-27 09:09:02,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:02,145 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-27 09:09:02,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:09:02,145 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-27 09:09:02,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-27 09:09:02,145 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:02,146 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:02,146 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:02,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:02,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-27 09:09:02,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:02,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:02,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:02,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:02,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:02,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:03,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:03,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:03,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:03,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:03,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:03,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:03,064 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 [2018-10-27 09:09:03,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:03,071 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:09:03,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:03,170 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:03,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:03,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:04,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:04,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:04,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 09:09:04,146 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:04,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 09:09:04,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 09:09:04,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:09:04,148 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-27 09:09:04,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:04,283 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-27 09:09:04,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:09:04,284 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-27 09:09:04,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:04,285 INFO L225 Difference]: With dead ends: 108 [2018-10-27 09:09:04,285 INFO L226 Difference]: Without dead ends: 102 [2018-10-27 09:09:04,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:09:04,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-27 09:09:04,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-27 09:09:04,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-27 09:09:04,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-27 09:09:04,290 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-27 09:09:04,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:04,290 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-27 09:09:04,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 09:09:04,291 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-27 09:09:04,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-27 09:09:04,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:04,291 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:04,292 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:04,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:04,292 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-27 09:09:04,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:04,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:04,293 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:04,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:04,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:04,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:05,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:05,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:05,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:05,945 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:05,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:05,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:05,945 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 [2018-10-27 09:09:05,956 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:09:05,957 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:09:27,918 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 09:09:27,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:27,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:27,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:27,955 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:29,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:29,139 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:29,139 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 09:09:29,139 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:29,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:09:29,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:09:29,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:09:29,141 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-27 09:09:29,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:29,353 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-27 09:09:29,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:09:29,353 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-27 09:09:29,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:29,355 INFO L225 Difference]: With dead ends: 111 [2018-10-27 09:09:29,355 INFO L226 Difference]: Without dead ends: 105 [2018-10-27 09:09:29,356 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:09:29,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-27 09:09:29,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-27 09:09:29,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-27 09:09:29,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-27 09:09:29,359 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-27 09:09:29,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:29,360 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-27 09:09:29,360 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:09:29,360 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-27 09:09:29,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-27 09:09:29,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:29,361 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:29,361 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:29,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:29,361 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-27 09:09:29,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:29,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:29,362 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:29,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:29,362 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:29,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:29,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:29,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:29,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:29,923 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:29,923 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:29,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:29,924 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 [2018-10-27 09:09:29,932 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:09:29,932 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:09:30,045 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:09:30,045 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:30,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:30,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:30,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:31,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:31,833 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:31,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-10-27 09:09:31,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:31,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 09:09:31,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 09:09:31,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 09:09:31,835 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 34 states. [2018-10-27 09:09:32,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:32,022 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-27 09:09:32,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 09:09:32,022 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 103 [2018-10-27 09:09:32,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:32,024 INFO L225 Difference]: With dead ends: 114 [2018-10-27 09:09:32,024 INFO L226 Difference]: Without dead ends: 108 [2018-10-27 09:09:32,025 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 09:09:32,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-27 09:09:32,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-27 09:09:32,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-27 09:09:32,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-10-27 09:09:32,029 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 103 [2018-10-27 09:09:32,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:32,030 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-10-27 09:09:32,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 09:09:32,030 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-10-27 09:09:32,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-27 09:09:32,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:32,031 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:32,031 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:32,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:32,031 INFO L82 PathProgramCache]: Analyzing trace with hash 806955834, now seen corresponding path program 31 times [2018-10-27 09:09:32,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:32,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:32,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:32,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:32,032 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:32,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:33,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:33,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:33,467 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:33,467 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:33,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:33,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:33,468 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 [2018-10-27 09:09:33,476 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:33,476 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:09:33,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:33,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:33,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:33,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:34,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:34,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:34,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-27 09:09:34,781 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:34,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:09:34,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:09:34,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:09:34,783 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 35 states. [2018-10-27 09:09:34,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:34,935 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-27 09:09:34,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:09:34,935 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 106 [2018-10-27 09:09:34,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:34,936 INFO L225 Difference]: With dead ends: 117 [2018-10-27 09:09:34,936 INFO L226 Difference]: Without dead ends: 111 [2018-10-27 09:09:34,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:09:34,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-27 09:09:34,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-27 09:09:34,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-27 09:09:34,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-10-27 09:09:34,940 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 106 [2018-10-27 09:09:34,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:34,941 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-10-27 09:09:34,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:09:34,941 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-10-27 09:09:34,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-27 09:09:34,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:34,942 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:34,942 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:34,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:34,942 INFO L82 PathProgramCache]: Analyzing trace with hash -2111919965, now seen corresponding path program 32 times [2018-10-27 09:09:34,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:34,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:34,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:34,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:34,944 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:34,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:35,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:35,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:35,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:35,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:35,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:35,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:35,507 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 [2018-10-27 09:09:35,514 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:09:35,514 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:10:05,479 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 09:10:05,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:10:05,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:10:05,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:05,521 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:10:06,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:06,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:10:06,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-27 09:10:06,745 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:10:06,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 09:10:06,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 09:10:06,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:10:06,747 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 36 states. [2018-10-27 09:10:06,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:10:06,914 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-27 09:10:06,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:10:06,914 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 109 [2018-10-27 09:10:06,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:10:06,916 INFO L225 Difference]: With dead ends: 120 [2018-10-27 09:10:06,916 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 09:10:06,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:10:06,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 09:10:06,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-27 09:10:06,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-27 09:10:06,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-10-27 09:10:06,922 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 109 [2018-10-27 09:10:06,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:10:06,922 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-10-27 09:10:06,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 09:10:06,922 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-10-27 09:10:06,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-10-27 09:10:06,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:10:06,923 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:10:06,923 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:10:06,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:10:06,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1861994138, now seen corresponding path program 33 times [2018-10-27 09:10:06,924 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:10:06,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:06,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:10:06,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:06,925 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:10:06,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:07,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:07,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:07,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:10:07,585 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:10:07,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:10:07,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:07,585 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 [2018-10-27 09:10:07,596 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:10:07,597 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:10:07,717 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:10:07,717 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:10:07,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:10:07,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:07,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:10:09,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:09,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:10:09,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-10-27 09:10:09,449 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:10:09,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 09:10:09,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 09:10:09,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 09:10:09,450 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 37 states. [2018-10-27 09:10:09,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:10:09,595 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-27 09:10:09,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 09:10:09,596 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 112 [2018-10-27 09:10:09,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:10:09,597 INFO L225 Difference]: With dead ends: 123 [2018-10-27 09:10:09,597 INFO L226 Difference]: Without dead ends: 117 [2018-10-27 09:10:09,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 09:10:09,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-27 09:10:09,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-27 09:10:09,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-27 09:10:09,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-10-27 09:10:09,602 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 112 [2018-10-27 09:10:09,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:10:09,602 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-10-27 09:10:09,602 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 09:10:09,602 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-10-27 09:10:09,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-27 09:10:09,603 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:10:09,603 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:10:09,603 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:10:09,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:10:09,604 INFO L82 PathProgramCache]: Analyzing trace with hash -2036477629, now seen corresponding path program 34 times [2018-10-27 09:10:09,604 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:10:09,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:09,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:10:09,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:09,605 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:10:09,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:10,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:10,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:10,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:10:10,332 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:10:10,332 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:10:10,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:10,332 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 [2018-10-27 09:10:10,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:10:10,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:10:10,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:10,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:10:10,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:10,584 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:10:12,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:12,103 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:10:12,103 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-27 09:10:12,103 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:10:12,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 09:10:12,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 09:10:12,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:10:12,105 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 38 states. [2018-10-27 09:10:12,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:10:12,226 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-27 09:10:12,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:10:12,227 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 115 [2018-10-27 09:10:12,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:10:12,228 INFO L225 Difference]: With dead ends: 126 [2018-10-27 09:10:12,228 INFO L226 Difference]: Without dead ends: 120 [2018-10-27 09:10:12,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:10:12,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-27 09:10:12,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-27 09:10:12,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-27 09:10:12,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-10-27 09:10:12,234 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 115 [2018-10-27 09:10:12,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:10:12,234 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-10-27 09:10:12,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 09:10:12,234 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-10-27 09:10:12,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-10-27 09:10:12,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:10:12,235 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:10:12,235 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:10:12,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:10:12,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1198237190, now seen corresponding path program 35 times [2018-10-27 09:10:12,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:10:12,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:12,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:10:12,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:10:12,237 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:10:12,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:10:12,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:10:12,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:12,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:10:12,886 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:10:12,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:10:12,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:10:12,886 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 [2018-10-27 09:10:12,893 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:10:12,894 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:11:04,764 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 09:11:04,764 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:11:04,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:04,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:04,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:06,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:06,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:06,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-27 09:11:06,609 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:06,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:11:06,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:11:06,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:11:06,610 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 39 states. [2018-10-27 09:11:06,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:06,745 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-27 09:11:06,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 09:11:06,748 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 118 [2018-10-27 09:11:06,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:06,749 INFO L225 Difference]: With dead ends: 129 [2018-10-27 09:11:06,749 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 09:11:06,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:11:06,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 09:11:06,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-27 09:11:06,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-27 09:11:06,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-10-27 09:11:06,752 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 118 [2018-10-27 09:11:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:06,752 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-10-27 09:11:06,752 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:11:06,753 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-10-27 09:11:06,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-27 09:11:06,753 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:06,754 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:06,754 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:06,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:06,754 INFO L82 PathProgramCache]: Analyzing trace with hash -117177885, now seen corresponding path program 36 times [2018-10-27 09:11:06,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:06,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:06,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:11:06,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:06,755 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:06,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:07,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:07,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:07,439 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:07,440 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:07,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:07,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:07,440 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 [2018-10-27 09:11:07,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:11:07,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:11:07,583 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:11:07,583 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:11:07,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:07,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:07,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:09,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:09,620 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:09,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-10-27 09:11:09,621 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:09,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 09:11:09,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 09:11:09,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 09:11:09,622 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 40 states. [2018-10-27 09:11:09,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:09,822 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-27 09:11:09,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:11:09,829 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-27 09:11:09,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:09,830 INFO L225 Difference]: With dead ends: 132 [2018-10-27 09:11:09,830 INFO L226 Difference]: Without dead ends: 126 [2018-10-27 09:11:09,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 09:11:09,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-27 09:11:09,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-27 09:11:09,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-27 09:11:09,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-10-27 09:11:09,835 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 121 [2018-10-27 09:11:09,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:09,835 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-10-27 09:11:09,835 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 09:11:09,835 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-10-27 09:11:09,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-27 09:11:09,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:09,836 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:09,837 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:09,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:09,837 INFO L82 PathProgramCache]: Analyzing trace with hash 2055791962, now seen corresponding path program 37 times [2018-10-27 09:11:09,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:09,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:09,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:11:09,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:09,838 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:09,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:10,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:10,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:10,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:10,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:10,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:10,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:10,862 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 [2018-10-27 09:11:10,869 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:10,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:11:11,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:11,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:11,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:11,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:14,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:14,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:14,078 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-27 09:11:14,078 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:14,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 09:11:14,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 09:11:14,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:11:14,079 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 41 states. [2018-10-27 09:11:15,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:15,046 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-27 09:11:15,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 09:11:15,047 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 124 [2018-10-27 09:11:15,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:15,048 INFO L225 Difference]: With dead ends: 135 [2018-10-27 09:11:15,048 INFO L226 Difference]: Without dead ends: 129 [2018-10-27 09:11:15,049 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:11:15,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-27 09:11:15,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-27 09:11:15,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-27 09:11:15,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-10-27 09:11:15,052 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 124 [2018-10-27 09:11:15,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:15,053 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-10-27 09:11:15,053 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 09:11:15,053 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-10-27 09:11:15,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-27 09:11:15,054 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:15,054 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:15,054 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:15,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:15,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1041548669, now seen corresponding path program 38 times [2018-10-27 09:11:15,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:15,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:15,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:15,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:15,056 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:15,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:16,040 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:16,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:16,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:16,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:16,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:16,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:16,041 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 [2018-10-27 09:11:16,049 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:11:16,049 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown