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/const_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:28:23,629 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:28:23,631 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:28:23,643 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:28:23,643 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:28:23,644 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:28:23,645 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:28:23,647 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:28:23,649 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:28:23,650 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:28:23,651 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:28:23,651 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:28:23,652 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:28:23,653 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:28:23,654 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:28:23,655 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:28:23,656 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:28:23,658 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:28:23,660 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:28:23,662 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:28:23,663 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:28:23,664 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:28:23,667 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:28:23,667 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:28:23,667 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:28:23,668 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:28:23,669 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:28:23,670 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:28:23,671 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:28:23,672 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:28:23,673 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:28:23,673 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:28:23,676 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:28:23,699 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:28:23,699 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:28:23,700 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:28:23,700 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:28:23,701 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:28:23,701 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:28:23,701 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:28:23,701 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:28:23,702 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:28:23,703 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:28:23,703 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:28:23,704 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:28:23,704 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:28:23,704 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:28:23,706 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:28:23,706 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:28:23,706 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:28:23,706 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:28:23,706 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:28:23,707 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:28:23,707 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:28:23,707 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:28:23,707 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:28:23,707 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:28:23,708 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:28:23,709 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:28:23,710 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:23,710 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:28:23,710 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:28:23,710 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:28:23,710 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:28:23,711 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:28:23,711 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:28:23,712 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:28:23,712 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:28:23,712 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:28:23,772 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:28:23,798 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:28:23,802 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:28:23,804 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:28:23,804 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:28:23,805 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-24 12:28:23,875 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/68c97b1c7/0e8cd2d31eb64251b595c0c61ccd22a9/FLAG9607078a9 [2018-10-24 12:28:24,255 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:28:24,256 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_false-unreach-call1.i [2018-10-24 12:28:24,263 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/68c97b1c7/0e8cd2d31eb64251b595c0c61ccd22a9/FLAG9607078a9 [2018-10-24 12:28:24,278 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/68c97b1c7/0e8cd2d31eb64251b595c0c61ccd22a9 [2018-10-24 12:28:24,288 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:28:24,290 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:28:24,293 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:24,294 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:28:24,300 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:28:24,301 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,305 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f27b578 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24, skipping insertion in model container [2018-10-24 12:28:24,305 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,316 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:28:24,341 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:28:24,575 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:24,580 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:28:24,600 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:24,618 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:28:24,618 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24 WrapperNode [2018-10-24 12:28:24,619 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:24,619 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:24,620 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:28:24,620 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:28:24,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,636 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,642 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:24,643 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:28:24,643 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:28:24,643 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:28:24,653 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,653 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,654 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,654 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,663 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,665 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:28:24,665 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:28:24,665 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:28:24,665 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:28:24,666 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:28:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:28:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:28:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:28:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:28:24,726 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:28:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:28:24,726 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:28:25,064 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:28:25,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:25 BoogieIcfgContainer [2018-10-24 12:28:25,065 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:28:25,066 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:28:25,066 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:28:25,069 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:28:25,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:28:24" (1/3) ... [2018-10-24 12:28:25,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b447c35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:25, skipping insertion in model container [2018-10-24 12:28:25,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24" (2/3) ... [2018-10-24 12:28:25,071 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b447c35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:25, skipping insertion in model container [2018-10-24 12:28:25,071 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:25" (3/3) ... [2018-10-24 12:28:25,073 INFO L112 eAbstractionObserver]: Analyzing ICFG const_false-unreach-call1.i [2018-10-24 12:28:25,081 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:28:25,088 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:28:25,101 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:28:25,130 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:28:25,130 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:28:25,130 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:28:25,130 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:28:25,130 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:28:25,130 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:28:25,130 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:28:25,131 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:28:25,148 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-24 12:28:25,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:28:25,155 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,156 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,158 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,166 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-24 12:28:25,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,218 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:25,269 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:25,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:28:25,270 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:25,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:28:25,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:28:25,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:25,288 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-24 12:28:25,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:25,310 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-24 12:28:25,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:28:25,312 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:28:25,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:25,321 INFO L225 Difference]: With dead ends: 29 [2018-10-24 12:28:25,322 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 12:28:25,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:25,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 12:28:25,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 12:28:25,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 12:28:25,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 12:28:25,361 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-24 12:28:25,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:25,361 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 12:28:25,362 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:28:25,362 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 12:28:25,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:28:25,363 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,363 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,363 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,364 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,364 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-24 12:28:25,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,366 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:25,479 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:25,480 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:28:25,480 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:25,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:25,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:25,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:25,484 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-24 12:28:25,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:25,533 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-24 12:28:25,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:25,534 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:28:25,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:25,535 INFO L225 Difference]: With dead ends: 19 [2018-10-24 12:28:25,535 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 12:28:25,536 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:25,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 12:28:25,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 12:28:25,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 12:28:25,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 12:28:25,541 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 12:28:25,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:25,541 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 12:28:25,541 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:25,541 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 12:28:25,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:28:25,542 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,542 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,543 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-24 12:28:25,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,545 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:25,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:25,675 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:25,676 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-24 12:28:25,678 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-24 12:28:25,712 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:25,713 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:25,989 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:25,995 INFO L272 AbstractInterpreter]: Visited 12 different actions 25 times. Merged at 3 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-24 12:28:26,048 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:26,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,051 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:26,067 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,068 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:26,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,097 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:26,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:26,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:26,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:28:26,290 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:26,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:28:26,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:28:26,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:26,291 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-24 12:28:26,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:26,317 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:28:26,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:28:26,318 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-24 12:28:26,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:26,319 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:28:26,319 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:28:26,320 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:28:26,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:28:26,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 12:28:26,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 12:28:26,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 12:28:26,325 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 12:28:26,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:26,325 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 12:28:26,325 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:28:26,325 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 12:28:26,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:28:26,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:26,326 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:26,326 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:26,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,327 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-24 12:28:26,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:26,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,328 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:26,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:26,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:26,463 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:26,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:26,481 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:26,481 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:26,532 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:28:26,532 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:26,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:26,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:26,814 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:26,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:28:26,836 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:26,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:28:26,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:28:26,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:28:26,837 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-24 12:28:26,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:26,881 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-24 12:28:26,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:26,882 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-24 12:28:26,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:26,883 INFO L225 Difference]: With dead ends: 23 [2018-10-24 12:28:26,883 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:28:26,883 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:28:26,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:28:26,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:28:26,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:28:26,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 12:28:26,888 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 12:28:26,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:26,888 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 12:28:26,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:28:26,889 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 12:28:26,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:28:26,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:26,890 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:26,890 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:26,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,890 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-24 12:28:26,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:26,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:26,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,892 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:26,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,015 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:27,015 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:27,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,016 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:27,024 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:27,025 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:27,040 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:27,040 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:27,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:27,059 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:27,343 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:27,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:28:27,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:27,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:28:27,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:28:27,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:27,367 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-24 12:28:27,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:27,413 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-24 12:28:27,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:28:27,413 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-24 12:28:27,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:27,414 INFO L225 Difference]: With dead ends: 25 [2018-10-24 12:28:27,415 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 12:28:27,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:28:27,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 12:28:27,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 12:28:27,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:28:27,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 12:28:27,420 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 12:28:27,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:27,421 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 12:28:27,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:28:27,421 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 12:28:27,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:28:27,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:27,422 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:27,422 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:27,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,423 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-24 12:28:27,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:27,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:27,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:27,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,552 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,553 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:27,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:27,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,553 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:27,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:27,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:27,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:28,549 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:28,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:28:28,571 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:28,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:28:28,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:28:28,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:28,572 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-24 12:28:28,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:28,614 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:28:28,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:28:28,614 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-24 12:28:28,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:28,615 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:28:28,615 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:28:28,616 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:28:28,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:28:28,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 12:28:28,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 12:28:28,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-24 12:28:28,621 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-24 12:28:28,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:28,622 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-24 12:28:28,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:28:28,622 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-24 12:28:28,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:28:28,623 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:28,623 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:28,623 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:28,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:28,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-24 12:28:28,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:28,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:28,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,625 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:28,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,768 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:28,769 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:28,769 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:28,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,769 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:28,778 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:28,778 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:28,853 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:28:28,853 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:28,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:28,887 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:29,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:28:29,457 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:29,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:28:29,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:28:29,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:29,459 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-24 12:28:29,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:29,560 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-24 12:28:29,561 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:29,562 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-24 12:28:29,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:29,563 INFO L225 Difference]: With dead ends: 29 [2018-10-24 12:28:29,563 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:28:29,563 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:28:29,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:28:29,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 12:28:29,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:28:29,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 12:28:29,568 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-24 12:28:29,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:29,569 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 12:28:29,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:28:29,569 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 12:28:29,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:28:29,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:29,570 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:29,570 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:29,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:29,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-24 12:28:29,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:29,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:29,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,572 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:29,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:29,858 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:29,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:29,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:29,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:29,868 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:29,868 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:29,881 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:29,881 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:29,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:29,909 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:30,389 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,424 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:30,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:28:30,425 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:30,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:30,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:30,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:28:30,426 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-24 12:28:30,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:30,503 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-24 12:28:30,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:28:30,505 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-24 12:28:30,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:30,506 INFO L225 Difference]: With dead ends: 31 [2018-10-24 12:28:30,506 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 12:28:30,507 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:28:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 12:28:30,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 12:28:30,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:28:30,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 12:28:30,512 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-24 12:28:30,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:30,512 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 12:28:30,512 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:30,512 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 12:28:30,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:28:30,513 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:30,513 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:30,513 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:30,514 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:30,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-24 12:28:30,514 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:30,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,515 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:30,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,515 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:30,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,694 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,694 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:30,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:30,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:30,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:30,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:30,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:30,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:30,739 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:34,289 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:34,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:28:34,310 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:34,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:28:34,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:28:34,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:28:34,311 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-24 12:28:34,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:34,447 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:28:34,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:28:34,448 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-24 12:28:34,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:34,449 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:28:34,449 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 12:28:34,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:28:34,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 12:28:34,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-24 12:28:34,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:28:34,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-24 12:28:34,455 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-24 12:28:34,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:34,455 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-24 12:28:34,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:28:34,455 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-24 12:28:34,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 12:28:34,456 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:34,456 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:34,457 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:34,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:34,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-24 12:28:34,457 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:34,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,458 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:34,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,459 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:34,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:34,649 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:34,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:34,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:34,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:34,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:34,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:34,660 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:34,660 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:34,696 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:28:34,697 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:34,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:34,711 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:40,902 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 70 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:40,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:40,923 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:28:40,923 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:40,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:28:40,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:28:40,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=261, Unknown=1, NotChecked=0, Total=380 [2018-10-24 12:28:40,925 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-24 12:28:41,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:41,010 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-24 12:28:41,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:41,010 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-24 12:28:41,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:41,012 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:28:41,012 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:28:41,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=118, Invalid=261, Unknown=1, NotChecked=0, Total=380 [2018-10-24 12:28:41,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:28:41,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 12:28:41,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:28:41,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 12:28:41,018 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-24 12:28:41,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:41,018 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 12:28:41,018 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:28:41,018 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 12:28:41,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:28:41,019 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:41,019 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:41,020 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:41,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:41,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-24 12:28:41,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:41,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,021 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:41,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,022 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:41,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:41,311 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:41,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:41,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:41,312 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:41,312 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:41,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:41,312 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:41,320 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:41,320 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:41,333 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:41,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:41,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:41,368 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:41,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:46,523 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:46,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:46,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:28:46,544 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:46,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:28:46,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:28:46,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:28:46,545 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-24 12:28:46,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:46,746 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-24 12:28:46,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:28:46,748 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-24 12:28:46,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:46,749 INFO L225 Difference]: With dead ends: 37 [2018-10-24 12:28:46,749 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:28:46,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:28:46,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:28:46,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 12:28:46,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:28:46,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 12:28:46,754 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-24 12:28:46,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:46,754 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 12:28:46,755 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:28:46,755 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 12:28:46,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:28:46,756 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:46,756 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:46,756 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:46,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:46,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-24 12:28:46,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:46,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:46,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:46,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:46,758 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:46,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:47,073 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:47,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:47,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:47,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:47,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:47,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:47,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:47,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:47,083 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:47,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:47,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:47,141 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:47,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:53,586 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 108 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:53,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:53,607 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:28:53,607 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:53,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:28:53,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:28:53,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-24 12:28:53,609 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-24 12:28:53,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:53,778 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:28:53,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:28:53,785 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-24 12:28:53,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:53,786 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:28:53,786 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:28:53,786 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=166, Invalid=385, Unknown=1, NotChecked=0, Total=552 [2018-10-24 12:28:53,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:28:53,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 12:28:53,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 12:28:53,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 12:28:53,792 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-24 12:28:53,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:53,792 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 12:28:53,793 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:28:53,793 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 12:28:53,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 12:28:53,794 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:53,794 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:53,794 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:53,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:53,795 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-24 12:28:53,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:53,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:53,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:53,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:53,796 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:53,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:54,095 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:54,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:54,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:54,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:54,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:54,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:54,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:54,103 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:54,103 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:54,251 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:28:54,251 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:54,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:54,278 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:54,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:59,704 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:59,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:59,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:28:59,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:59,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:28:59,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:28:59,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:28:59,728 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-24 12:28:59,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:59,926 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-24 12:28:59,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:28:59,929 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-24 12:28:59,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:59,930 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:28:59,930 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:28:59,931 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:28:59,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:28:59,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 12:28:59,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:28:59,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 12:28:59,935 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-24 12:28:59,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:59,936 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 12:28:59,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:28:59,936 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 12:28:59,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:28:59,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:59,937 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:59,937 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:59,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:59,937 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-24 12:28:59,937 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:59,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:59,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:59,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:59,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:59,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:00,231 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:00,231 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:00,232 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:00,232 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:00,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:00,232 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:00,239 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:00,239 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:00,254 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:00,254 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:00,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:00,273 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:12,592 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 152 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:12,612 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:12,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:29:12,612 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:12,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:29:12,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:29:12,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=531, Unknown=3, NotChecked=0, Total=756 [2018-10-24 12:29:12,613 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-24 12:29:12,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:12,768 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-24 12:29:12,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:29:12,768 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-24 12:29:12,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:12,769 INFO L225 Difference]: With dead ends: 43 [2018-10-24 12:29:12,770 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 12:29:12,771 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=222, Invalid=531, Unknown=3, NotChecked=0, Total=756 [2018-10-24 12:29:12,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 12:29:12,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 12:29:12,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:29:12,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 12:29:12,775 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-24 12:29:12,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:12,775 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 12:29:12,776 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:29:12,776 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 12:29:12,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:29:12,777 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:12,777 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:12,777 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:12,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:12,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-24 12:29:12,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:12,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:12,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:12,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:12,779 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:12,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:13,043 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:13,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:13,043 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:13,043 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:13,043 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:13,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:13,043 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:13,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:13,052 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:13,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:13,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:13,093 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:13,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:20,152 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:20,172 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:20,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:29:20,172 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:20,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:29:20,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:29:20,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:29:20,174 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-24 12:29:20,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:20,476 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:29:20,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:29:20,477 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-24 12:29:20,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:20,477 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:29:20,478 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:29:20,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:29:20,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:29:20,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-24 12:29:20,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:29:20,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-24 12:29:20,484 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-24 12:29:20,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:20,484 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-24 12:29:20,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:29:20,484 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-24 12:29:20,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:29:20,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:20,485 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:20,485 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:20,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:20,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-24 12:29:20,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:20,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:20,487 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:20,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:20,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:20,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:21,222 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:21,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:21,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:21,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:21,223 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:21,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:21,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:21,236 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:21,236 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:21,352 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:29:21,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:21,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:21,390 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:21,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:35,852 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 208 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:35,873 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:35,873 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:29:35,873 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:35,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:29:35,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:29:35,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-24 12:29:35,875 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-24 12:29:36,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:36,050 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-24 12:29:36,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:29:36,051 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-24 12:29:36,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:36,052 INFO L225 Difference]: With dead ends: 47 [2018-10-24 12:29:36,052 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:29:36,052 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=286, Invalid=705, Unknown=1, NotChecked=0, Total=992 [2018-10-24 12:29:36,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:29:36,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-24 12:29:36,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:29:36,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 12:29:36,058 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-24 12:29:36,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:36,058 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 12:29:36,058 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:29:36,058 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 12:29:36,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:29:36,059 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:36,059 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:36,059 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:36,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:36,060 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-24 12:29:36,060 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:36,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:36,060 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:36,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:36,061 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:36,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:36,594 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:36,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:36,595 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:36,595 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:36,595 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:36,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:36,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:36,603 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:36,603 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:36,647 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:36,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:36,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:36,725 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:36,726 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:54,175 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 234 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:54,195 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:54,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:29:54,195 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:54,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:29:54,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:29:54,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=797, Unknown=4, NotChecked=0, Total=1122 [2018-10-24 12:29:54,196 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-24 12:29:54,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:54,449 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-24 12:29:54,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:29:54,450 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-24 12:29:54,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:54,451 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:29:54,451 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 12:29:54,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=321, Invalid=797, Unknown=4, NotChecked=0, Total=1122 [2018-10-24 12:29:54,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 12:29:54,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-24 12:29:54,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:29:54,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 12:29:54,457 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-24 12:29:54,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:54,458 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 12:29:54,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:29:54,458 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 12:29:54,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:29:54,459 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:54,459 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:54,459 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:54,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:54,459 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-24 12:29:54,459 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:54,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:54,460 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:54,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:54,461 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:54,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:54,731 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:54,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:54,732 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:54,732 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:54,732 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:54,732 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:54,732 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:54,740 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:54,740 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:54,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:54,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:54,818 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:54,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:13,128 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 266 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:13,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:13,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:30:13,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:13,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:30:13,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:30:13,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=898, Unknown=4, NotChecked=0, Total=1260 [2018-10-24 12:30:13,149 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-24 12:30:13,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:13,494 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:30:13,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:30:13,495 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-24 12:30:13,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:13,496 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:30:13,496 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 12:30:13,497 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=358, Invalid=898, Unknown=4, NotChecked=0, Total=1260 [2018-10-24 12:30:13,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 12:30:13,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-24 12:30:13,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 12:30:13,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-24 12:30:13,503 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-24 12:30:13,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:13,503 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-24 12:30:13,503 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:30:13,503 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-24 12:30:13,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:30:13,504 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:13,504 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:13,505 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:13,505 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:13,505 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-24 12:30:13,505 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:13,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:13,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:13,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:13,506 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:14,251 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:14,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:14,251 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:14,251 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:14,251 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:14,251 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:14,251 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:14,258 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:14,258 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:14,895 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:30:14,895 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:14,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:14,928 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:14,929 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:40,476 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 302 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:40,496 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:40,496 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:30:40,496 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:40,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:30:40,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:30:40,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1005, Unknown=4, NotChecked=0, Total=1406 [2018-10-24 12:30:40,498 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-24 12:30:41,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:41,109 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-24 12:30:41,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:30:41,110 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-24 12:30:41,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:41,111 INFO L225 Difference]: With dead ends: 53 [2018-10-24 12:30:41,112 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:30:41,113 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=397, Invalid=1005, Unknown=4, NotChecked=0, Total=1406 [2018-10-24 12:30:41,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:30:41,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:30:41,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:30:41,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 12:30:41,116 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-24 12:30:41,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:41,116 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 12:30:41,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:30:41,117 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 12:30:41,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:30:41,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:41,117 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:41,118 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:41,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:41,118 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-24 12:30:41,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:41,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:41,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:41,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:41,119 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:41,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:41,557 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:41,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:41,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:41,557 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:41,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:41,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:41,558 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:41,572 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:41,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:41,593 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:41,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:41,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:41,606 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:41,606 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:06,106 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 340 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:06,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:06,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:31:06,126 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:06,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:31:06,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:31:06,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1121, Unknown=1, NotChecked=0, Total=1560 [2018-10-24 12:31:06,128 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-24 12:31:06,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:06,413 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-24 12:31:06,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:31:06,414 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-24 12:31:06,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:06,415 INFO L225 Difference]: With dead ends: 55 [2018-10-24 12:31:06,415 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 12:31:06,416 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=438, Invalid=1121, Unknown=1, NotChecked=0, Total=1560 [2018-10-24 12:31:06,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 12:31:06,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-24 12:31:06,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:31:06,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 12:31:06,422 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-24 12:31:06,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:06,422 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 12:31:06,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:31:06,422 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 12:31:06,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:31:06,423 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:06,423 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:06,423 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:06,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:06,424 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-24 12:31:06,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:06,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:06,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:31:06,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:06,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:06,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:06,789 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:06,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:06,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:06,790 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:06,790 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:06,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:06,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:06,799 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:06,799 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:31:06,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:06,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:06,856 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:06,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:23,476 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:23,496 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:23,496 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:31:23,496 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:23,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:31:23,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:31:23,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:31:23,497 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-24 12:31:23,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:31:23,896 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:31:23,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:31:23,896 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-24 12:31:23,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:31:23,896 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:31:23,896 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:31:23,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:31:23,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:31:23,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-24 12:31:23,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:31:23,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-24 12:31:23,905 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-24 12:31:23,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:31:23,906 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-24 12:31:23,906 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:31:23,906 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-24 12:31:23,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:31:23,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:31:23,910 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:31:23,910 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:31:23,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:31:23,910 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-24 12:31:23,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:31:23,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:23,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:31:23,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:31:23,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:31:23,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:31:24,307 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:24,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:24,307 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:31:24,307 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:31:24,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:31:24,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:31:24,308 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:31:24,316 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:31:24,316 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:31:38,000 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:31:38,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:31:38,081 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:31:38,117 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:38,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:31:59,623 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:31:59,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:31:59,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:31:59,644 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:31:59,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:31:59,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:31:59,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1364, Unknown=2, NotChecked=0, Total=1892 [2018-10-24 12:31:59,646 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-24 12:32:00,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:00,000 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-24 12:32:00,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:32:00,003 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-24 12:32:00,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:00,004 INFO L225 Difference]: With dead ends: 59 [2018-10-24 12:32:00,004 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:32:00,005 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=526, Invalid=1364, Unknown=2, NotChecked=0, Total=1892 [2018-10-24 12:32:00,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:32:00,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-24 12:32:00,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:32:00,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 12:32:00,009 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-24 12:32:00,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:00,009 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 12:32:00,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:32:00,009 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 12:32:00,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:32:00,010 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:00,010 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:00,010 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:00,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:00,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-24 12:32:00,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:00,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:00,012 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:00,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:00,012 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:00,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:00,491 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:00,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:00,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:00,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:00,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:00,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:00,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:00,498 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:32:00,498 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:32:00,530 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:32:00,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:00,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:00,563 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:00,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:24,877 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 460 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:24,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:24,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-24 12:32:24,897 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:24,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:32:24,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:32:24,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1493, Unknown=4, NotChecked=0, Total=2070 [2018-10-24 12:32:24,899 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-24 12:32:25,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:25,243 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-24 12:32:25,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:32:25,243 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-24 12:32:25,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:25,244 INFO L225 Difference]: With dead ends: 61 [2018-10-24 12:32:25,244 INFO L226 Difference]: Without dead ends: 56 [2018-10-24 12:32:25,246 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.7s TimeCoverageRelationStatistics Valid=573, Invalid=1493, Unknown=4, NotChecked=0, Total=2070 [2018-10-24 12:32:25,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-24 12:32:25,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-24 12:32:25,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:32:25,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 12:32:25,249 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-24 12:32:25,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:25,250 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 12:32:25,250 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:32:25,250 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 12:32:25,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:32:25,251 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:25,251 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:25,251 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:25,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:25,251 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-24 12:32:25,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:25,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:25,252 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:25,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:25,252 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:25,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:27,230 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:27,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:27,231 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:27,231 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:27,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:27,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:27,231 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:27,240 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:27,240 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:32:27,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:27,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:27,277 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:27,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:33:00,337 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 500 refuted. 6 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:00,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:33:00,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-24 12:33:00,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:33:00,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:33:00,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:33:00,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1630, Unknown=4, NotChecked=0, Total=2256 [2018-10-24 12:33:00,360 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-10-24 12:33:00,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:33:00,731 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:33:00,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:33:00,732 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-10-24 12:33:00,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:33:00,733 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:33:00,733 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:33:00,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.9s TimeCoverageRelationStatistics Valid=622, Invalid=1630, Unknown=4, NotChecked=0, Total=2256 [2018-10-24 12:33:00,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:33:00,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-24 12:33:00,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:33:00,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-24 12:33:00,738 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-24 12:33:00,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:33:00,739 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-24 12:33:00,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:33:00,739 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-24 12:33:00,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:33:00,739 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:33:00,740 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:33:00,740 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:33:00,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:33:00,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1216973154, now seen corresponding path program 23 times [2018-10-24 12:33:00,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:33:00,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:00,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:33:00,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:33:00,741 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:33:00,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:33:01,259 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:33:01,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:01,260 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:33:01,260 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:33:01,260 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:33:01,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:33:01,260 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:33:01,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:33:01,267 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