java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:28:23,355 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:28:23,357 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:28:23,370 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:28:23,370 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:28:23,371 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:28:23,372 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:28:23,375 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:28:23,377 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:28:23,378 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:28:23,379 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:28:23,379 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:28:23,380 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:28:23,382 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:28:23,383 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:28:23,384 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:28:23,385 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:28:23,387 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:28:23,389 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:28:23,391 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:28:23,392 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:28:23,394 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:28:23,397 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:28:23,397 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:28:23,397 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:28:23,398 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:28:23,399 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:28:23,401 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:28:23,402 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:28:23,403 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:28:23,403 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:28:23,404 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:28:23,407 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 12:28:23,423 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:28:23,424 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:28:23,425 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:28:23,426 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:28:23,426 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:28:23,426 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:28:23,426 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:28:23,427 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:28:23,427 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:28:23,427 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:28:23,427 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:28:23,427 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:28:23,428 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:28:23,428 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:28:23,429 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:28:23,429 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:28:23,429 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:28:23,429 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:28:23,429 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:28:23,429 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:28:23,430 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:28:23,433 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:28:23,433 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:28:23,433 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:28:23,433 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:28:23,433 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:28:23,434 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:28:23,434 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:28:23,434 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:28:23,434 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:28:23,435 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:28:23,435 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:28:23,435 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:28:23,435 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:28:23,436 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:28:23,436 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:28:23,502 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:28:23,521 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:28:23,526 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:28:23,528 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:28:23,528 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:28:23,529 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call2_true-termination.i [2018-10-24 12:28:23,603 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1e9dc39de/29cc502c4bc04598a90739ea4891e586/FLAGdff9fe5a4 [2018-10-24 12:28:24,062 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:28:24,063 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call2_true-termination.i [2018-10-24 12:28:24,068 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1e9dc39de/29cc502c4bc04598a90739ea4891e586/FLAGdff9fe5a4 [2018-10-24 12:28:24,085 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/1e9dc39de/29cc502c4bc04598a90739ea4891e586 [2018-10-24 12:28:24,101 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:28:24,103 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:28:24,109 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:24,109 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:28:24,115 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:28:24,116 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,120 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73f9ea25 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 12:28:24,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:28:24" (1/1) ... [2018-10-24 12:28:24,132 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:28:24,160 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:28:24,362 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:24,365 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:28:24,385 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:28:24,410 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:28:24,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:28:24 WrapperNode [2018-10-24 12:28:24,411 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:28:24,412 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:24,412 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:28:24,412 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:28:24,423 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 12:28:24,435 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 12:28:24,458 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:28:24,458 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:28:24,459 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:28:24,459 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:28:24,470 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 12:28:24,470 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 12:28:24,472 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 12:28:24,472 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 12:28:24,478 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 12:28:24,483 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 12:28:24,484 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 12:28:24,486 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:28:24,487 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:28:24,487 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:28:24,487 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:28:24,488 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 12:28:24,619 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:28:24,619 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:28:24,619 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:28:24,619 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:28:24,620 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:28:24,620 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:28:24,620 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:28:24,620 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:28:24,857 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:28:24,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:24 BoogieIcfgContainer [2018-10-24 12:28:24,858 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:28:24,859 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:28:24,860 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:28:24,863 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:28:24,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:28:24" (1/3) ... [2018-10-24 12:28:24,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f80b8e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:24, skipping insertion in model container [2018-10-24 12:28:24,864 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 12:28:24,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f80b8e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:28:24, skipping insertion in model container [2018-10-24 12:28:24,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:28:24" (3/3) ... [2018-10-24 12:28:24,867 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call2_true-termination.i [2018-10-24 12:28:24,878 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:28:24,886 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:28:24,904 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:28:24,940 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:28:24,941 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:28:24,941 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:28:24,941 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:28:24,941 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:28:24,941 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:28:24,941 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:28:24,942 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:28:24,961 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-24 12:28:24,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-24 12:28:24,967 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:24,968 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:24,971 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:24,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:24,976 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-24 12:28:24,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,030 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,115 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 12:28:25,118 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:25,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:28:25,118 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:25,126 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:28:25,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:28:25,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:28:25,142 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-24 12:28:25,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:25,165 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-24 12:28:25,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:28:25,166 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-24 12:28:25,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:25,174 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:28:25,174 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 12:28:25,178 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 12:28:25,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 12:28:25,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-24 12:28:25,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:28:25,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-24 12:28:25,223 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-24 12:28:25,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:25,224 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-24 12:28:25,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:28:25,224 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-24 12:28:25,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:28:25,226 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,226 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,227 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,227 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-24 12:28:25,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,229 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,229 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,367 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 12:28:25,368 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:28:25,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:28:25,368 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:28:25,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:28:25,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:28:25,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:28:25,371 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-24 12:28:25,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:25,453 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 12:28:25,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:28:25,454 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-24 12:28:25,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:25,455 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:28:25,455 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:28:25,457 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 12:28:25,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:28:25,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-24 12:28:25,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-24 12:28:25,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-24 12:28:25,466 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-24 12:28:25,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:25,467 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-24 12:28:25,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:28:25,467 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-24 12:28:25,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:28:25,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:25,468 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:25,469 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:25,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:25,469 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-24 12:28:25,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:25,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:25,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:25,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:25,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:25,712 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 12:28:25,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:25,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:25,717 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-24 12:28:25,719 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-24 12:28:25,758 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:28:25,758 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:28:26,134 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:28:26,135 INFO L272 AbstractInterpreter]: Visited 15 different actions 31 times. Merged at 5 different actions 10 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-24 12:28:26,181 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:28:26,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,183 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 12:28:26,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,197 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:26,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:26,402 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 12:28:26,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:26,549 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 12:28:26,579 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:26,579 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-24 12:28:26,579 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:26,580 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:28:26,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:28:26,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:28:26,581 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-24 12:28:26,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:26,682 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:28:26,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:28:26,683 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-24 12:28:26,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:26,684 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:28:26,684 INFO L226 Difference]: Without dead ends: 21 [2018-10-24 12:28:26,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:28:26,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-24 12:28:26,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-24 12:28:26,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:28:26,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 12:28:26,690 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-24 12:28:26,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:26,690 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 12:28:26,690 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:28:26,690 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 12:28:26,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:28:26,691 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:26,692 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:26,692 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:26,692 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:26,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-24 12:28:26,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:26,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:26,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:26,694 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:26,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:26,895 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:26,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:26,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:26,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:26,897 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 12:28:26,910 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:26,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:26,965 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:28:26,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:26,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:26,989 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:26,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:27,098 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:27,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:28:27,120 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:27,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:28:27,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:28:27,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:28:27,121 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-24 12:28:27,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:27,189 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 12:28:27,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:28:27,189 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-24 12:28:27,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:27,190 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:28:27,191 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:28:27,191 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:28:27,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:28:27,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-24 12:28:27,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-24 12:28:27,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-24 12:28:27,197 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-24 12:28:27,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:27,197 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-24 12:28:27,197 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:28:27,197 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-24 12:28:27,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-24 12:28:27,198 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:27,198 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:27,199 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:27,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,199 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-24 12:28:27,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:27,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,201 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:27,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,201 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:27,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,335 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:27,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:27,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,336 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 12:28:27,344 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:27,344 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:27,379 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:27,379 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:27,382 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:27,401 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:27,736 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,762 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:27,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-24 12:28:27,763 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:27,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:28:27,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:28:27,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:28:27,764 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-24 12:28:27,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:27,825 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:28:27,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:28:27,826 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-24 12:28:27,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:27,830 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:28:27,830 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:28:27,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:28:27,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:28:27,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-24 12:28:27,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:28:27,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 12:28:27,837 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-24 12:28:27,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:27,837 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 12:28:27,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:28:27,838 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 12:28:27,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:28:27,838 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:27,839 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:27,839 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:27,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:27,840 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-24 12:28:27,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:27,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:27,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:27,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:27,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:27,971 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:27,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,971 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:27,972 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:27,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:27,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:27,972 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:28:27,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:27,987 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:28,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:28,053 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:28,633 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,654 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:28,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:28:28,654 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:28,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:28:28,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:28:28,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:28:28,656 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-24 12:28:28,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:28,797 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 12:28:28,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:28:28,799 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-24 12:28:28,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:28,800 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:28:28,800 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:28:28,801 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:28:28,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:28:28,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-24 12:28:28,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:28:28,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-24 12:28:28,807 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-24 12:28:28,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:28,807 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-24 12:28:28,807 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:28:28,808 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-24 12:28:28,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-24 12:28:28,809 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:28,809 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:28,809 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:28,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:28,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-24 12:28:28,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:28,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:28,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:28,811 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:28,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:28,982 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:28,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:28,983 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:28,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:28,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:28,984 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 12:28:28,998 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:28,998 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:29,072 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:28:29,073 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:29,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:29,117 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:29,305 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:29,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:28:29,328 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:29,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:28:29,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:28:29,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:28:29,330 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-24 12:28:29,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:29,402 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:28:29,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:28:29,402 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-24 12:28:29,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:29,404 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:28:29,404 INFO L226 Difference]: Without dead ends: 33 [2018-10-24 12:28:29,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:28:29,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-24 12:28:29,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-24 12:28:29,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:28:29,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 12:28:29,410 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-24 12:28:29,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:29,410 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 12:28:29,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:28:29,411 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 12:28:29,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:28:29,412 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:29,412 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:29,412 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:29,412 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:29,412 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-24 12:28:29,413 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:29,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,414 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:29,414 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:29,414 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:29,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:29,579 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:29,580 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:29,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:29,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:29,580 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 12:28:29,590 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:29,590 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:29,657 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:29,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:29,661 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:29,771 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:29,771 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:30,164 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:30,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-10-24 12:28:30,187 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:30,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:28:30,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:28:30,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:28:30,188 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-24 12:28:30,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:30,254 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:28:30,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:28:30,256 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-24 12:28:30,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:30,257 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:28:30,257 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:28:30,258 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:28:30,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:28:30,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-24 12:28:30,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-24 12:28:30,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-24 12:28:30,264 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-24 12:28:30,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:30,264 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-24 12:28:30,264 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:28:30,264 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-24 12:28:30,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:28:30,265 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:30,266 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:30,266 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:30,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:30,266 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-24 12:28:30,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:30,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,267 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:30,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,268 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:30,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,405 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,406 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:30,406 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:30,406 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:30,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:30,406 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 12:28:30,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:30,415 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:30,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:30,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:30,490 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:30,699 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:30,721 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:30,721 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:28:30,721 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:30,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:28:30,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:28:30,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:28:30,723 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-24 12:28:30,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:30,782 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:28:30,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:28:30,783 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-24 12:28:30,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:30,784 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:28:30,785 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:28:30,785 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:28:30,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:28:30,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:28:30,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:28:30,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 12:28:30,790 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-24 12:28:30,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:30,791 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 12:28:30,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:28:30,791 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 12:28:30,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:28:30,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:30,792 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:30,792 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:30,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:30,793 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-24 12:28:30,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:30,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,794 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:30,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:30,794 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:30,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:31,028 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:31,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:31,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:31,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:31,030 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 12:28:31,040 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:31,040 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:31,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:28:31,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:31,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:31,189 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:31,542 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:31,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:31,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:28:31,564 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:31,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:28:31,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:28:31,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:28:31,565 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-24 12:28:31,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:31,720 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:28:31,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:28:31,722 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-24 12:28:31,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:31,723 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:28:31,723 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:28:31,724 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:28:31,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:28:31,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-24 12:28:31,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-24 12:28:31,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-24 12:28:31,730 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-24 12:28:31,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:31,730 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-24 12:28:31,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:28:31,730 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-24 12:28:31,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-24 12:28:31,732 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:31,732 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:31,732 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:31,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:31,732 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-24 12:28:31,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:31,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,734 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:31,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:31,734 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:31,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,063 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:32,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:32,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:32,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:28:32,072 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:32,072 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:32,131 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:32,131 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:32,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:32,173 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:32,461 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:32,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-10-24 12:28:32,482 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:32,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:28:32,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:28:32,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:28:32,483 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-24 12:28:32,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:32,546 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:28:32,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:28:32,553 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-24 12:28:32,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:32,554 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:28:32,554 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:28:32,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:28:32,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:28:32,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-24 12:28:32,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:28:32,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 12:28:32,560 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-24 12:28:32,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:32,560 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 12:28:32,560 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:28:32,560 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 12:28:32,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:28:32,561 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:32,561 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:32,562 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:32,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:32,562 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-24 12:28:32,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:32,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:32,563 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:32,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:32,563 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:32,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,812 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,812 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:32,812 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:32,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:32,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:32,813 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 12:28:32,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:32,829 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:32,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:32,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:32,927 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:32,927 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:33,184 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:33,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:28:33,207 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:33,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:28:33,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:28:33,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:28:33,209 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-24 12:28:33,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:33,265 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:28:33,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:28:33,266 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-24 12:28:33,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:33,268 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:28:33,268 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:28:33,269 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:28:33,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:28:33,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-24 12:28:33,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:28:33,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-24 12:28:33,274 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-24 12:28:33,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:33,274 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-24 12:28:33,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:28:33,274 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-24 12:28:33,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:28:33,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:33,275 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:33,276 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:33,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:33,276 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-24 12:28:33,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:33,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,277 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:33,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:33,278 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:33,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:33,530 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:33,531 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:33,531 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:33,531 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:33,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:33,531 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 12:28:33,565 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:33,565 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:33,746 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:28:33,746 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:33,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:33,784 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:33,785 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:34,006 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:34,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:34,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:28:34,027 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:34,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:28:34,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:28:34,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:28:34,029 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-24 12:28:34,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:34,123 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:28:34,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:28:34,125 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-24 12:28:34,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:34,126 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:28:34,126 INFO L226 Difference]: Without dead ends: 51 [2018-10-24 12:28:34,127 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:28:34,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-24 12:28:34,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-24 12:28:34,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:28:34,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 12:28:34,132 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-24 12:28:34,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:34,133 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 12:28:34,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:28:34,134 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 12:28:34,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:28:34,135 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:34,135 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:34,135 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:34,135 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:34,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-24 12:28:34,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:34,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:34,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:34,142 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:34,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:35,103 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:35,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:35,103 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:35,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:35,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,105 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 12:28:35,114 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:35,114 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:35,191 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:35,191 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:35,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:35,276 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:35,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:35,520 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:35,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:35,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-10-24 12:28:35,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:35,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:28:35,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:28:35,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:28:35,542 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-24 12:28:35,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:35,696 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:28:35,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:28:35,697 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-24 12:28:35,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:35,698 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:28:35,698 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:28:35,699 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:28:35,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:28:35,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-24 12:28:35,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-24 12:28:35,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-24 12:28:35,704 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-24 12:28:35,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:35,705 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-24 12:28:35,705 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:28:35,705 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-24 12:28:35,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-24 12:28:35,706 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:35,707 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:35,707 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:35,707 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:35,707 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-24 12:28:35,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:35,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:35,708 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:35,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:35,708 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:35,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:35,926 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:35,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:35,927 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:35,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:35,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:35,927 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 12:28:35,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:35,935 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:35,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:36,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:36,087 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:36,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:36,708 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:36,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:36,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:28:36,730 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:36,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:28:36,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:28:36,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:28:36,731 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-24 12:28:36,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:36,822 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:28:36,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:28:36,822 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-24 12:28:36,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:36,823 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:28:36,823 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:28:36,825 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:28:36,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:28:36,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-24 12:28:36,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:28:36,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 12:28:36,830 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-24 12:28:36,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:36,830 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 12:28:36,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:28:36,831 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 12:28:36,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:28:36,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:36,831 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:36,832 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:36,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:36,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-24 12:28:36,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:36,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:36,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:36,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:36,833 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:36,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:37,125 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:37,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:37,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:37,126 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:37,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:37,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:37,126 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 12:28:37,134 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:37,134 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:37,459 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:28:37,460 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:37,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:37,491 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:37,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:37,976 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:37,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:37,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:28:37,997 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:37,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:28:37,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:28:37,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:28:37,998 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-24 12:28:38,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:38,114 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:28:38,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:28:38,115 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-24 12:28:38,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:38,116 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:28:38,116 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:28:38,117 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:28:38,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:28:38,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-24 12:28:38,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:28:38,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-24 12:28:38,123 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-24 12:28:38,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:38,123 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-24 12:28:38,123 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:28:38,123 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-24 12:28:38,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-24 12:28:38,124 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:38,124 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:38,124 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:38,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:38,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-24 12:28:38,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:38,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:38,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:38,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:38,126 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:38,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:38,439 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:38,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:38,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:38,440 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:38,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:38,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:38,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:28:38,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:38,448 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:38,515 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:38,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:38,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:38,568 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:38,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:39,492 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:39,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:39,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-10-24 12:28:39,512 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:39,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:28:39,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:28:39,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:28:39,514 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-24 12:28:39,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:39,584 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:28:39,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:28:39,594 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-24 12:28:39,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:39,595 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:28:39,595 INFO L226 Difference]: Without dead ends: 63 [2018-10-24 12:28:39,596 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:28:39,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-24 12:28:39,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-24 12:28:39,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 12:28:39,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-24 12:28:39,600 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-24 12:28:39,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:39,601 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-24 12:28:39,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:28:39,601 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-24 12:28:39,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:28:39,602 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:39,602 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:39,602 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:39,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:39,603 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-24 12:28:39,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:39,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:39,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:39,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:39,604 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:39,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:39,973 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:39,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:39,973 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:39,974 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:39,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:39,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:39,974 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 12:28:39,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:39,982 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:40,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:40,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:40,095 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:40,096 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:41,113 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:41,141 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:41,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:28:41,142 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:41,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:28:41,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:28:41,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:28:41,143 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-24 12:28:41,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:41,240 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:28:41,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:28:41,240 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-24 12:28:41,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:41,241 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:28:41,242 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:28:41,243 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:28:41,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:28:41,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-24 12:28:41,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-24 12:28:41,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-24 12:28:41,249 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-24 12:28:41,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:41,249 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-24 12:28:41,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:28:41,249 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-24 12:28:41,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:28:41,250 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:41,250 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:41,251 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:41,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:41,251 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-24 12:28:41,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:41,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:41,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:41,252 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:41,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:41,888 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:41,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:41,888 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:41,888 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:41,889 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:41,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:41,889 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 12:28:41,896 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:41,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:42,381 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:28:42,381 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:42,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:42,410 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:42,844 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:42,865 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:42,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:28:42,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:42,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:28:42,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:28:42,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:28:42,867 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-24 12:28:42,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:42,974 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:28:42,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:28:42,975 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-24 12:28:42,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:42,976 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:28:42,976 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:28:42,977 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:28:42,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:28:42,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-24 12:28:42,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:28:42,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-24 12:28:42,983 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-24 12:28:42,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:42,983 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-24 12:28:42,983 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:28:42,983 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-24 12:28:42,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:28:42,984 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:42,984 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:42,984 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:42,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:42,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-24 12:28:42,985 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:42,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,986 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:42,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:42,986 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:43,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:43,556 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:43,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,556 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:43,556 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:43,556 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:43,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:43,556 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 12:28:43,563 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:43,564 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:43,640 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:43,641 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:43,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:43,657 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:43,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:44,118 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,139 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:44,140 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-10-24 12:28:44,140 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:44,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:28:44,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:28:44,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:28:44,141 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-24 12:28:44,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:44,226 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:28:44,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:28:44,226 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-24 12:28:44,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:44,227 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:28:44,227 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:28:44,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:28:44,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:28:44,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-24 12:28:44,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-24 12:28:44,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-24 12:28:44,233 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-24 12:28:44,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:44,233 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-24 12:28:44,233 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:28:44,233 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-24 12:28:44,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-24 12:28:44,234 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:44,234 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:44,235 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:44,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:44,235 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-24 12:28:44,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:44,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:44,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:44,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:44,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:44,544 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,544 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:44,544 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:44,544 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:44,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:44,545 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 12:28:44,553 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:44,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:44,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:44,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:44,654 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:44,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:45,168 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:45,189 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:45,189 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:28:45,189 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:45,190 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:28:45,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:28:45,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:28:45,191 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-24 12:28:45,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:45,297 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:28:45,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:28:45,297 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-24 12:28:45,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:45,298 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:28:45,299 INFO L226 Difference]: Without dead ends: 75 [2018-10-24 12:28:45,300 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:28:45,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-24 12:28:45,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-24 12:28:45,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:28:45,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-24 12:28:45,304 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-24 12:28:45,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:45,304 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-24 12:28:45,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:28:45,305 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-24 12:28:45,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 12:28:45,305 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:45,305 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:45,306 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:45,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:45,306 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-24 12:28:45,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:45,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:45,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:45,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:45,307 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:45,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:47,022 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:47,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:47,022 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:47,022 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:47,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:47,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:47,023 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 12:28:47,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:47,031 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:48,670 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:28:48,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:48,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:48,707 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:48,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:49,419 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:49,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:49,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:28:49,442 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:49,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:28:49,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:28:49,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:28:49,444 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-24 12:28:49,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:49,552 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:28:49,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:28:49,556 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-24 12:28:49,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:49,557 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:28:49,557 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:28:49,558 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:28:49,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:28:49,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-24 12:28:49,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:28:49,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-24 12:28:49,562 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-24 12:28:49,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:49,563 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-24 12:28:49,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:28:49,563 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-24 12:28:49,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:28:49,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:49,564 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:49,564 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:49,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:49,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-24 12:28:49,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:49,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:49,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:49,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:49,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:49,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:50,157 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:50,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:50,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:50,158 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:50,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:50,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:50,158 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 12:28:50,167 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:50,167 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:50,249 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:50,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:50,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:50,360 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:50,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:51,232 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:51,253 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:51,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-10-24 12:28:51,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:51,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:28:51,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:28:51,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:28:51,255 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-24 12:28:51,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:51,340 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-24 12:28:51,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:28:51,341 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-24 12:28:51,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:51,342 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:28:51,343 INFO L226 Difference]: Without dead ends: 81 [2018-10-24 12:28:51,344 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:28:51,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-24 12:28:51,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-24 12:28:51,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:28:51,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-24 12:28:51,346 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-24 12:28:51,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:51,346 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-24 12:28:51,346 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:28:51,347 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-24 12:28:51,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-24 12:28:51,347 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:51,347 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:51,348 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:51,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:51,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-24 12:28:51,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:51,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:51,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:51,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:51,349 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:51,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:52,034 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:52,035 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:52,035 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:52,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:52,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:52,035 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 12:28:52,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:52,043 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:28:52,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:52,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:52,768 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:52,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:52,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:28:52,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:52,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:28:52,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:28:52,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:28:52,792 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-24 12:28:52,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:52,941 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-24 12:28:52,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:28:52,941 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-24 12:28:52,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:52,943 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:28:52,943 INFO L226 Difference]: Without dead ends: 84 [2018-10-24 12:28:52,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:28:52,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-24 12:28:52,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-24 12:28:52,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-24 12:28:52,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-24 12:28:52,948 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-24 12:28:52,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:52,948 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-24 12:28:52,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:28:52,949 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-24 12:28:52,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-24 12:28:52,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:52,950 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:52,950 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:52,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:52,950 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-24 12:28:52,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:52,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:52,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:52,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:52,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:52,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:53,781 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:53,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:53,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:53,782 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:53,782 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:53,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:53,782 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 12:28:53,789 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:28:53,790 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:28:56,122 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:28:56,122 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:56,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:56,148 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:56,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:57,308 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:57,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:57,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:28:57,331 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:57,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:28:57,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:28:57,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:28:57,333 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-24 12:28:57,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:57,422 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-24 12:28:57,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:28:57,423 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-24 12:28:57,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:57,424 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:28:57,424 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:28:57,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:28:57,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:28:57,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-24 12:28:57,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-24 12:28:57,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-24 12:28:57,430 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-24 12:28:57,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:57,430 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-24 12:28:57,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:28:57,430 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-24 12:28:57,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-24 12:28:57,431 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:57,431 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:57,431 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:57,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:57,432 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-24 12:28:57,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:57,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:57,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:57,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:57,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:57,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:57,778 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:57,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:57,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:57,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:57,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:57,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:57,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:57,786 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:28:57,786 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:28:57,875 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:28:57,875 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:28:57,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:28:57,970 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:57,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:28:59,136 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:59,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:28:59,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-10-24 12:28:59,158 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:28:59,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:28:59,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:28:59,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:28:59,160 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-24 12:28:59,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:28:59,283 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-24 12:28:59,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:28:59,286 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-24 12:28:59,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:28:59,288 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:28:59,288 INFO L226 Difference]: Without dead ends: 90 [2018-10-24 12:28:59,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:28:59,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-24 12:28:59,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-24 12:28:59,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:28:59,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-24 12:28:59,293 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-24 12:28:59,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:28:59,293 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-24 12:28:59,293 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:28:59,293 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-24 12:28:59,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-24 12:28:59,294 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:28:59,294 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:28:59,294 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:28:59,295 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:28:59,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-24 12:28:59,295 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:28:59,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:59,296 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:28:59,296 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:28:59,296 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:28:59,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:28:59,948 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:28:59,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:59,948 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:28:59,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:28:59,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:28:59,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:28:59,948 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:28:59,955 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:28:59,956 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:00,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:00,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:00,082 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:00,878 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:00,899 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:00,899 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:29:00,899 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:00,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:29:00,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:29:00,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:29:00,901 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-24 12:29:01,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:01,004 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-24 12:29:01,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:29:01,005 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-24 12:29:01,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:01,006 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:29:01,006 INFO L226 Difference]: Without dead ends: 93 [2018-10-24 12:29:01,007 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:29:01,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-24 12:29:01,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-24 12:29:01,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-24 12:29:01,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-24 12:29:01,010 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-24 12:29:01,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:01,010 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-24 12:29:01,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:29:01,011 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-24 12:29:01,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-24 12:29:01,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:01,011 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:01,011 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:01,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:01,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-24 12:29:01,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:01,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:01,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:01,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:01,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:01,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:03,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:03,093 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:03,093 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:03,093 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:03,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:03,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:03,094 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:03,101 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:03,101 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:13,156 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:29:13,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:13,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:13,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:13,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:14,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:14,069 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:14,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:29:14,070 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:14,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:29:14,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:29:14,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:29:14,073 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-24 12:29:14,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:14,177 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-24 12:29:14,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:29:14,178 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-24 12:29:14,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:14,179 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:29:14,179 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:29:14,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:29:14,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:29:14,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-24 12:29:14,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-24 12:29:14,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-24 12:29:14,184 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-24 12:29:14,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:14,185 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-24 12:29:14,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:29:14,185 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-24 12:29:14,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:29:14,185 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:14,185 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:14,186 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:14,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:14,186 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-24 12:29:14,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:14,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:14,187 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:14,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:14,187 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:14,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:14,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:14,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:14,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:14,765 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:14,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:14,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:14,766 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:14,773 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:14,773 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:14,889 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:14,889 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:14,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:14,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:14,946 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:15,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:15,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:15,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-10-24 12:29:15,883 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:15,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:29:15,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:29:15,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:29:15,885 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-24 12:29:16,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:16,075 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-24 12:29:16,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:29:16,075 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-24 12:29:16,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:16,076 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:29:16,076 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:29:16,077 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:29:16,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:29:16,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-24 12:29:16,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-24 12:29:16,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-24 12:29:16,081 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-24 12:29:16,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:16,081 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-24 12:29:16,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:29:16,082 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-24 12:29:16,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-24 12:29:16,082 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:16,082 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:16,083 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:16,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:16,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-24 12:29:16,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:16,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:16,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:16,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:16,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:16,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:17,015 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:17,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:17,016 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:17,016 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:17,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:17,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:17,016 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:17,026 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:17,027 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:17,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:17,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:17,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:17,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:18,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:18,342 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:18,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:29:18,343 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:18,343 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:29:18,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:29:18,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:29:18,344 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-24 12:29:18,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:18,482 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-24 12:29:18,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:29:18,483 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-24 12:29:18,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:18,484 INFO L225 Difference]: With dead ends: 108 [2018-10-24 12:29:18,484 INFO L226 Difference]: Without dead ends: 102 [2018-10-24 12:29:18,485 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:29:18,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-24 12:29:18,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-24 12:29:18,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-24 12:29:18,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-24 12:29:18,489 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-24 12:29:18,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:18,489 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-24 12:29:18,489 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:29:18,489 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-24 12:29:18,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-24 12:29:18,490 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:18,490 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:18,490 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:18,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:18,491 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-24 12:29:18,491 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:18,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:18,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:18,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:18,492 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:18,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:20,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:20,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:20,016 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:20,016 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:20,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:20,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:20,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:20,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:20,031 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:29:41,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:29:41,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:41,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:41,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:41,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:42,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:42,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:42,661 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:29:42,661 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:42,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:29:42,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:29:42,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:29:42,662 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-24 12:29:42,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:42,869 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-24 12:29:42,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:29:42,869 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-24 12:29:42,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:42,870 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:29:42,870 INFO L226 Difference]: Without dead ends: 105 [2018-10-24 12:29:42,871 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:29:42,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-24 12:29:42,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-24 12:29:42,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-24 12:29:42,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-24 12:29:42,875 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-24 12:29:42,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:42,876 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-24 12:29:42,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:29:42,876 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-24 12:29:42,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-24 12:29:42,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:42,877 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:42,877 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:42,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:42,877 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-24 12:29:42,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:42,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:42,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:42,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:42,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:42,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:43,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:43,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:43,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:43,541 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:43,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:43,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:43,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:43,550 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:29:43,551 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:29:43,663 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:29:43,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:29:43,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:43,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:43,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:45,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:45,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:45,587 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-10-24 12:29:45,587 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:45,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:29:45,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:29:45,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:29:45,589 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 34 states. [2018-10-24 12:29:45,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:45,738 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-24 12:29:45,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:29:45,739 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 103 [2018-10-24 12:29:45,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:45,740 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:29:45,740 INFO L226 Difference]: Without dead ends: 108 [2018-10-24 12:29:45,741 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:29:45,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-24 12:29:45,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-24 12:29:45,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:29:45,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-10-24 12:29:45,746 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 103 [2018-10-24 12:29:45,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:45,746 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-10-24 12:29:45,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:29:45,746 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-10-24 12:29:45,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-24 12:29:45,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:45,747 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:45,747 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:45,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:45,748 INFO L82 PathProgramCache]: Analyzing trace with hash 806955834, now seen corresponding path program 31 times [2018-10-24 12:29:45,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:45,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:45,749 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:29:45,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:45,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:45,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:46,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:46,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:46,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:46,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:46,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:46,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:46,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:46,273 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:46,273 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:29:46,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:46,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:29:46,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:46,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:29:47,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:47,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:29:47,567 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-24 12:29:47,567 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:29:47,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:29:47,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:29:47,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:29:47,569 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 35 states. [2018-10-24 12:29:47,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:29:47,713 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-24 12:29:47,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:29:47,713 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 106 [2018-10-24 12:29:47,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:29:47,715 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:29:47,715 INFO L226 Difference]: Without dead ends: 111 [2018-10-24 12:29:47,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:29:47,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-24 12:29:47,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-24 12:29:47,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-24 12:29:47,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-10-24 12:29:47,720 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 106 [2018-10-24 12:29:47,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:29:47,720 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-10-24 12:29:47,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:29:47,720 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-10-24 12:29:47,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-24 12:29:47,721 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:29:47,721 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:29:47,721 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:29:47,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:29:47,722 INFO L82 PathProgramCache]: Analyzing trace with hash -2111919965, now seen corresponding path program 32 times [2018-10-24 12:29:47,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:29:47,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:47,723 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:29:47,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:29:47,723 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:29:47,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:29:48,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:29:48,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:48,689 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:29:48,690 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:29:48,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:29:48,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:29:48,690 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:29:48,698 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:29:48,698 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:30:35,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:30:35,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:35,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:35,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:35,358 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:36,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:36,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:36,565 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-24 12:30:36,565 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:36,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:30:36,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:30:36,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:30:36,567 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 36 states. [2018-10-24 12:30:36,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:36,713 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-24 12:30:36,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:30:36,713 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 109 [2018-10-24 12:30:36,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:36,715 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:30:36,715 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:30:36,716 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:30:36,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:30:36,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-24 12:30:36,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-24 12:30:36,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-10-24 12:30:36,719 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 109 [2018-10-24 12:30:36,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:36,720 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-10-24 12:30:36,720 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:30:36,720 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-10-24 12:30:36,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-10-24 12:30:36,721 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:36,721 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:36,721 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:36,721 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:36,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1861994138, now seen corresponding path program 33 times [2018-10-24 12:30:36,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:36,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:36,722 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:36,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:36,722 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:36,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:37,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:37,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:37,427 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:37,428 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:37,428 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:37,428 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:37,428 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:37,435 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:30:37,435 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:30:37,567 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:30:37,567 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:30:37,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:37,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:37,688 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:38,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:38,983 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:38,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-10-24 12:30:38,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:38,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:30:38,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:30:38,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:30:38,985 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 37 states. [2018-10-24 12:30:39,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:39,133 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-24 12:30:39,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:30:39,134 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 112 [2018-10-24 12:30:39,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:39,135 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:30:39,135 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:30:39,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:30:39,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:30:39,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-24 12:30:39,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-24 12:30:39,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-10-24 12:30:39,138 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 112 [2018-10-24 12:30:39,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:39,138 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-10-24 12:30:39,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:30:39,139 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-10-24 12:30:39,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-24 12:30:39,139 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:39,139 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:39,139 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:39,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:39,140 INFO L82 PathProgramCache]: Analyzing trace with hash -2036477629, now seen corresponding path program 34 times [2018-10-24 12:30:39,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:39,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:39,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:30:39,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:39,141 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:39,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:39,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:39,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:39,791 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:39,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:39,792 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:39,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:39,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:39,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:39,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:30:39,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:39,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:30:40,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:40,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:30:41,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:41,497 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:30:41,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-24 12:30:41,498 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:30:41,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:30:41,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:30:41,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:30:41,499 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 38 states. [2018-10-24 12:30:41,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:30:41,627 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-24 12:30:41,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:30:41,628 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 115 [2018-10-24 12:30:41,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:30:41,629 INFO L225 Difference]: With dead ends: 126 [2018-10-24 12:30:41,629 INFO L226 Difference]: Without dead ends: 120 [2018-10-24 12:30:41,630 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:30:41,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-24 12:30:41,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-24 12:30:41,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:30:41,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-10-24 12:30:41,635 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 115 [2018-10-24 12:30:41,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:30:41,635 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-10-24 12:30:41,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:30:41,635 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-10-24 12:30:41,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-10-24 12:30:41,636 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:30:41,636 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:30:41,636 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:30:41,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:30:41,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1198237190, now seen corresponding path program 35 times [2018-10-24 12:30:41,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:30:41,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:41,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:30:41,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:30:41,637 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:30:41,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:30:42,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:30:42,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:42,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:30:42,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:30:42,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:30:42,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:30:42,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:30:42,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:30:42,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:32:08,501 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:32:08,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:08,525 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:08,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:08,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:10,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:10,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:10,233 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-24 12:32:10,233 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:10,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:32:10,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:32:10,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:32:10,234 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 39 states. [2018-10-24 12:32:10,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:10,374 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-24 12:32:10,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:32:10,375 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 118 [2018-10-24 12:32:10,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:10,376 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:32:10,376 INFO L226 Difference]: Without dead ends: 123 [2018-10-24 12:32:10,377 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:32:10,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-24 12:32:10,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-24 12:32:10,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-24 12:32:10,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-10-24 12:32:10,380 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 118 [2018-10-24 12:32:10,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:10,381 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-10-24 12:32:10,381 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:32:10,381 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-10-24 12:32:10,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-24 12:32:10,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:10,382 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:10,382 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:10,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:10,382 INFO L82 PathProgramCache]: Analyzing trace with hash -117177885, now seen corresponding path program 36 times [2018-10-24 12:32:10,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:10,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:10,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:10,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:10,383 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:10,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:11,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:11,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:11,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:11,045 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:11,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:11,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:11,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:11,052 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:32:11,053 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:32:11,206 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:32:11,207 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:32:11,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:11,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:11,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:12,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:12,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:12,945 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-10-24 12:32:12,945 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:12,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:32:12,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:32:12,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:32:12,947 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 40 states. [2018-10-24 12:32:13,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:13,122 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-24 12:32:13,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:32:13,125 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-24 12:32:13,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:13,126 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:32:13,126 INFO L226 Difference]: Without dead ends: 126 [2018-10-24 12:32:13,127 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:32:13,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-24 12:32:13,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-24 12:32:13,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-24 12:32:13,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-10-24 12:32:13,131 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 121 [2018-10-24 12:32:13,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:13,131 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-10-24 12:32:13,131 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:32:13,132 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-10-24 12:32:13,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-24 12:32:13,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:13,132 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:13,133 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:13,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:13,133 INFO L82 PathProgramCache]: Analyzing trace with hash 2055791962, now seen corresponding path program 37 times [2018-10-24 12:32:13,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:13,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:13,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:32:13,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:13,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:13,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:14,312 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:14,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:14,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:14,313 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:14,313 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:14,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:14,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:14,320 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:14,320 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:32:14,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:14,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:32:14,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:14,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:32:17,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:17,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:32:17,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-24 12:32:17,194 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:32:17,194 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:32:17,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:32:17,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:32:17,196 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 41 states. [2018-10-24 12:32:17,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:32:17,394 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-24 12:32:17,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:32:17,402 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 124 [2018-10-24 12:32:17,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:32:17,403 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:32:17,403 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:32:17,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:32:17,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:32:17,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-24 12:32:17,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-24 12:32:17,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-10-24 12:32:17,407 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 124 [2018-10-24 12:32:17,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:32:17,407 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-10-24 12:32:17,408 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:32:17,408 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-10-24 12:32:17,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-24 12:32:17,408 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:32:17,409 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:32:17,409 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:32:17,409 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:32:17,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1041548669, now seen corresponding path program 38 times [2018-10-24 12:32:17,409 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:32:17,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:17,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:32:17,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:32:17,410 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:32:17,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:32:18,170 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:32:18,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:18,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:32:18,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:32:18,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:32:18,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:32:18,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:32:18,180 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:32:18,180 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