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.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call4_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:10:46,367 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:10:46,369 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:10:46,382 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:10:46,382 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:10:46,383 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:10:46,385 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:10:46,387 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:10:46,388 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:10:46,389 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:10:46,390 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:10:46,390 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:10:46,391 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:10:46,392 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:10:46,393 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:10:46,394 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:10:46,395 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:10:46,397 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:10:46,399 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:10:46,400 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:10:46,401 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:10:46,404 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:10:46,408 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:10:46,408 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:10:46,409 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:10:46,412 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:10:46,412 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:10:46,413 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:10:46,417 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:10:46,418 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:10:46,419 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:10:46,419 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:10:46,419 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:10:46,421 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:10:46,422 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:10:46,423 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:10:46,423 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:10:46,445 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:10:46,445 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:10:46,446 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:10:46,446 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:10:46,447 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:10:46,448 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:10:46,448 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:10:46,448 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:10:46,448 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:10:46,449 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:10:46,449 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:10:46,449 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:10:46,450 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:10:46,450 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:10:46,450 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:10:46,451 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:10:46,451 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:10:46,451 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:10:46,451 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:10:46,451 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:10:46,453 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:10:46,453 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:10:46,453 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:10:46,453 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:10:46,453 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:10:46,454 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:10:46,454 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:10:46,454 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:10:46,454 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:10:46,454 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:10:46,455 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:10:46,455 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:10:46,455 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:10:46,455 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:10:46,515 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:10:46,531 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:10:46,536 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:10:46,538 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:10:46,538 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:10:46,539 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call4_true-termination.i [2018-10-24 12:10:46,602 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e87ea3d2d/d35117b1a59b49d4a67225384bc5e16f/FLAG024782d75 [2018-10-24 12:10:47,026 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:10:47,027 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call4_true-termination.i [2018-10-24 12:10:47,034 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e87ea3d2d/d35117b1a59b49d4a67225384bc5e16f/FLAG024782d75 [2018-10-24 12:10:47,048 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e87ea3d2d/d35117b1a59b49d4a67225384bc5e16f [2018-10-24 12:10:47,060 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:10:47,061 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:10:47,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:10:47,062 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:10:47,066 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:10:47,067 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,070 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@368859d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47, skipping insertion in model container [2018-10-24 12:10:47,070 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,081 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:10:47,101 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:10:47,297 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:10:47,303 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:10:47,328 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:10:47,357 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:10:47,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47 WrapperNode [2018-10-24 12:10:47,357 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:10:47,358 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:10:47,359 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:10:47,359 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:10:47,369 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,381 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,406 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:10:47,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:10:47,406 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:10:47,407 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:10:47,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,417 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,419 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,433 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,439 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (1/1) ... [2018-10-24 12:10:47,444 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:10:47,445 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:10:47,445 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:10:47,446 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:10:47,446 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (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 12:10:47,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:10:47,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:10:47,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:10:47,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:10:47,569 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:10:47,570 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:10:47,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:10:47,570 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:10:47,904 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:10:47,905 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:10:47 BoogieIcfgContainer [2018-10-24 12:10:47,905 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:10:47,906 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:10:47,906 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:10:47,909 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:10:47,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:10:47" (1/3) ... [2018-10-24 12:10:47,910 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@327bc52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:10:47, skipping insertion in model container [2018-10-24 12:10:47,910 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:10:47" (2/3) ... [2018-10-24 12:10:47,911 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@327bc52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:10:47, skipping insertion in model container [2018-10-24 12:10:47,911 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:10:47" (3/3) ... [2018-10-24 12:10:47,912 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call4_true-termination.i [2018-10-24 12:10:47,922 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:10:47,929 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:10:47,947 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:10:47,981 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:10:47,981 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:10:47,981 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:10:47,981 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:10:47,981 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:10:47,982 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:10:47,982 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:10:47,982 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:10:47,999 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-24 12:10:48,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:10:48,004 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:48,005 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:48,007 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:48,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:48,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-24 12:10:48,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:48,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:48,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,065 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:48,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:48,139 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 12:10:48,141 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:10:48,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:10:48,142 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:10:48,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:10:48,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:10:48,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:10:48,162 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-24 12:10:48,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:48,183 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-24 12:10:48,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:10:48,185 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:10:48,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:48,194 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:10:48,194 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:10:48,198 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 12:10:48,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:10:48,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:10:48,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:10:48,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 12:10:48,233 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 12:10:48,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:48,234 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 12:10:48,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:10:48,234 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 12:10:48,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:10:48,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:48,235 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:48,236 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:48,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:48,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-24 12:10:48,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:48,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:48,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:48,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:48,344 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 12:10:48,344 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:10:48,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:10:48,345 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:10:48,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:10:48,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:10:48,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:10:48,347 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-24 12:10:48,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:48,408 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-24 12:10:48,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:10:48,410 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-24 12:10:48,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:48,413 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:10:48,413 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:10:48,414 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 12:10:48,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:10:48,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-24 12:10:48,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:10:48,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-24 12:10:48,420 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-24 12:10:48,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:48,421 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-24 12:10:48,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:10:48,421 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-24 12:10:48,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-24 12:10:48,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:48,422 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:48,423 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:48,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:48,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-24 12:10:48,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:48,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:48,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:48,540 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 12:10:48,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:48,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:48,542 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-24 12:10:48,544 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-24 12:10:48,595 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:10:48,596 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:10:49,234 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-24 12:10:49,236 INFO L272 AbstractInterpreter]: Visited 16 different actions 48 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 30 variables. [2018-10-24 12:10:49,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:49,269 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-24 12:10:49,453 INFO L232 lantSequenceWeakener]: Weakened 16 states. On average, predicates are now at 85.6% of their original sizes. [2018-10-24 12:10:49,453 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-24 12:10:49,676 INFO L413 sIntCurrentIteration]: We have 17 unified AI predicates [2018-10-24 12:10:49,677 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-24 12:10:49,677 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:10:49,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [4] total 11 [2018-10-24 12:10:49,678 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:10:49,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:10:49,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:10:49,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:10:49,679 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2018-10-24 12:10:50,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:50,356 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-10-24 12:10:50,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:10:50,357 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-24 12:10:50,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:50,358 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:10:50,358 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:10:50,359 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:10:50,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:10:50,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2018-10-24 12:10:50,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-24 12:10:50,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-10-24 12:10:50,367 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 18 [2018-10-24 12:10:50,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:50,368 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-10-24 12:10:50,368 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:10:50,368 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-10-24 12:10:50,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-24 12:10:50,369 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:50,370 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:50,370 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:50,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:50,370 INFO L82 PathProgramCache]: Analyzing trace with hash 867262738, now seen corresponding path program 1 times [2018-10-24 12:10:50,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:50,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:50,372 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:50,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:50,372 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:50,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:50,511 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:50,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:50,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:50,512 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 31 with the following transitions: [2018-10-24 12:10:50,513 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-24 12:10:50,515 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:10:50,515 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:10:53,532 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:10:53,532 INFO L272 AbstractInterpreter]: Visited 19 different actions 732 times. Merged at 7 different actions 372 times. Widened at 2 different actions 87 times. Found 2 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-24 12:10:53,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:53,546 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:10:53,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:53,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:10:53,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:53,563 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:53,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:53,634 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:53,735 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:53,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:53,987 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:54,013 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:54,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:10:54,013 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:54,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:10:54,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:10:54,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:10:54,015 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 6 states. [2018-10-24 12:10:54,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:54,154 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2018-10-24 12:10:54,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:10:54,155 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 30 [2018-10-24 12:10:54,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:54,156 INFO L225 Difference]: With dead ends: 53 [2018-10-24 12:10:54,156 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:10:54,157 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:10:54,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:10:54,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2018-10-24 12:10:54,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 12:10:54,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-10-24 12:10:54,164 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 30 [2018-10-24 12:10:54,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:54,164 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-10-24 12:10:54,164 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:10:54,164 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-10-24 12:10:54,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 12:10:54,165 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:54,166 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:54,166 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:54,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:54,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1046082345, now seen corresponding path program 2 times [2018-10-24 12:10:54,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:54,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:54,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:54,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:54,168 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:54,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:54,382 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:54,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:54,383 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:54,383 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:54,383 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:54,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:54,384 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 12:10:54,400 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:54,401 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:54,485 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:10:54,485 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:54,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:54,594 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:54,594 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:55,141 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:55,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:55,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-24 12:10:55,175 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:55,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:10:55,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:10:55,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:10:55,177 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 7 states. [2018-10-24 12:10:55,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:55,251 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2018-10-24 12:10:55,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:10:55,254 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2018-10-24 12:10:55,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:55,255 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:10:55,256 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:10:55,256 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:10:55,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:10:55,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2018-10-24 12:10:55,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:10:55,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-24 12:10:55,269 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 33 [2018-10-24 12:10:55,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:55,269 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-24 12:10:55,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:10:55,272 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-24 12:10:55,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:10:55,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:55,273 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:55,274 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:55,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:55,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1296502514, now seen corresponding path program 3 times [2018-10-24 12:10:55,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:55,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:55,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,276 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:55,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:55,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:55,414 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:55,414 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:55,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:55,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:55,414 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 12:10:55,422 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:55,422 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:55,479 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:55,479 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:55,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:55,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:55,671 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:55,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:55,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:10:55,693 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:55,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:10:55,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:10:55,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:10:55,694 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 8 states. [2018-10-24 12:10:55,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:55,790 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2018-10-24 12:10:55,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:10:55,791 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-10-24 12:10:55,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:55,792 INFO L225 Difference]: With dead ends: 67 [2018-10-24 12:10:55,792 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 12:10:55,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:10:55,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 12:10:55,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 40. [2018-10-24 12:10:55,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:10:55,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-24 12:10:55,800 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2018-10-24 12:10:55,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:55,801 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-24 12:10:55,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:10:55,801 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-24 12:10:55,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:10:55,802 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:55,802 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:55,802 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:55,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:55,803 INFO L82 PathProgramCache]: Analyzing trace with hash 318444279, now seen corresponding path program 4 times [2018-10-24 12:10:55,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:55,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,804 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:55,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,804 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:55,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:55,899 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:55,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:55,900 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:55,900 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:55,900 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:55,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:55,900 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 12:10:55,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:55,909 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:55,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:55,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:56,053 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:56,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:56,336 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:56,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:56,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:10:56,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:56,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:10:56,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:10:56,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:10:56,359 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 9 states. [2018-10-24 12:10:56,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:56,548 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-10-24 12:10:56,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:10:56,552 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 39 [2018-10-24 12:10:56,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:56,553 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:10:56,553 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:10:56,554 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:10:56,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:10:56,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 43. [2018-10-24 12:10:56,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:10:56,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-24 12:10:56,562 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2018-10-24 12:10:56,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:56,562 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-24 12:10:56,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:10:56,562 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-24 12:10:56,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:10:56,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:56,563 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:56,564 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:56,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:56,564 INFO L82 PathProgramCache]: Analyzing trace with hash 43701458, now seen corresponding path program 5 times [2018-10-24 12:10:56,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:56,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:56,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:56,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:56,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:56,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:56,722 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:10:56,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:56,723 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:56,723 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:56,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:56,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:56,723 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 12:10:56,732 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:56,732 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:56,765 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:10:56,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:56,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:56,824 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:10:56,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:56,966 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-24 12:10:56,988 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:56,988 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 18 [2018-10-24 12:10:56,988 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:56,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:10:56,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:10:56,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:10:56,990 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 12 states. [2018-10-24 12:10:57,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:57,185 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2018-10-24 12:10:57,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:10:57,188 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2018-10-24 12:10:57,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:57,189 INFO L225 Difference]: With dead ends: 83 [2018-10-24 12:10:57,189 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:10:57,191 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:10:57,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:10:57,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-24 12:10:57,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:10:57,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-24 12:10:57,208 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 42 [2018-10-24 12:10:57,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:57,208 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-24 12:10:57,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:10:57,208 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-24 12:10:57,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:10:57,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:57,210 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:57,210 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:57,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:57,210 INFO L82 PathProgramCache]: Analyzing trace with hash -65813737, now seen corresponding path program 6 times [2018-10-24 12:10:57,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:57,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:57,211 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:57,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:57,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:57,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:57,451 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:57,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:57,452 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:57,452 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:57,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:57,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:57,452 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 12:10:57,459 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:57,459 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:57,503 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:57,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:57,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:57,533 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:57,534 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:57,654 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:57,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:57,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:10:57,675 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:57,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:10:57,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:10:57,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:10:57,676 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 11 states. [2018-10-24 12:10:57,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:57,773 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2018-10-24 12:10:57,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:10:57,773 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2018-10-24 12:10:57,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:57,774 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:10:57,774 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:10:57,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 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 12:10:57,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:10:57,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2018-10-24 12:10:57,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:10:57,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-24 12:10:57,784 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-24 12:10:57,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:57,784 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-24 12:10:57,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:10:57,784 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-24 12:10:57,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-24 12:10:57,785 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:57,785 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:57,786 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:57,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:57,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1181148210, now seen corresponding path program 7 times [2018-10-24 12:10:57,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:57,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:57,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:57,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:57,787 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:57,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:57,946 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:57,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:57,946 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:57,946 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:57,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:57,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:57,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:10:57,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:57,954 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:58,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:58,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:58,034 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:58,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:58,227 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:58,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:58,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:10:58,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:58,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:10:58,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:10:58,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:10:58,249 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 12 states. [2018-10-24 12:10:58,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:58,467 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-24 12:10:58,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:10:58,467 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 60 [2018-10-24 12:10:58,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:58,468 INFO L225 Difference]: With dead ends: 103 [2018-10-24 12:10:58,468 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:10:58,469 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:10:58,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:10:58,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 64. [2018-10-24 12:10:58,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-24 12:10:58,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-24 12:10:58,480 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2018-10-24 12:10:58,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:58,480 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-24 12:10:58,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:10:58,481 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-24 12:10:58,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-24 12:10:58,482 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:58,482 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:58,483 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:58,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:58,483 INFO L82 PathProgramCache]: Analyzing trace with hash -2042599113, now seen corresponding path program 8 times [2018-10-24 12:10:58,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:58,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:58,484 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:58,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:58,484 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:58,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:58,743 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-24 12:10:58,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:58,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:58,743 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:58,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:58,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:58,744 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 12:10:58,751 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:58,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:58,826 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:10:58,826 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:58,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:58,899 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-24 12:10:58,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:59,347 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-24 12:10:59,367 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:59,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-24 12:10:59,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:59,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:10:59,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:10:59,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:10:59,369 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 15 states. [2018-10-24 12:10:59,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:59,608 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2018-10-24 12:10:59,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:10:59,609 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2018-10-24 12:10:59,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:59,610 INFO L225 Difference]: With dead ends: 112 [2018-10-24 12:10:59,610 INFO L226 Difference]: Without dead ends: 78 [2018-10-24 12:10:59,612 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:10:59,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-24 12:10:59,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2018-10-24 12:10:59,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:10:59,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-24 12:10:59,623 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 63 [2018-10-24 12:10:59,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:59,623 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-24 12:10:59,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:10:59,623 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-24 12:10:59,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-24 12:10:59,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:59,625 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:59,625 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:59,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:59,625 INFO L82 PathProgramCache]: Analyzing trace with hash -1037724716, now seen corresponding path program 9 times [2018-10-24 12:10:59,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:59,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:59,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:59,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:59,627 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:59,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:59,797 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:10:59,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:59,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:59,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:59,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:59,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:59,798 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 12:10:59,805 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:59,805 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:59,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:59,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:59,862 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:59,891 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:10:59,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:00,144 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:11:00,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:00,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:11:00,165 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:00,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:11:00,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:11:00,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:11:00,166 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 14 states. [2018-10-24 12:11:00,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:00,402 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-10-24 12:11:00,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:11:00,402 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 75 [2018-10-24 12:11:00,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:00,403 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:11:00,404 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:11:00,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:11:00,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:11:00,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2018-10-24 12:11:00,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:11:00,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-24 12:11:00,428 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2018-10-24 12:11:00,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:00,428 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-24 12:11:00,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:11:00,431 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-24 12:11:00,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-24 12:11:00,432 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:00,432 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:00,432 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:00,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:00,433 INFO L82 PathProgramCache]: Analyzing trace with hash -448084945, now seen corresponding path program 10 times [2018-10-24 12:11:00,433 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:00,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:00,438 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:00,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:00,439 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:00,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:00,648 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:11:00,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:00,648 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:00,648 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:00,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:00,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:00,649 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 12:11:00,658 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:00,658 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:00,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:00,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:00,744 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:11:00,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:00,991 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:11:01,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:01,012 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:11:01,012 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:01,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:11:01,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:11:01,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:11:01,014 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-24 12:11:01,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:01,203 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2018-10-24 12:11:01,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:11:01,203 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2018-10-24 12:11:01,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:01,204 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:11:01,204 INFO L226 Difference]: Without dead ends: 92 [2018-10-24 12:11:01,205 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:11:01,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-24 12:11:01,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-24 12:11:01,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-24 12:11:01,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-24 12:11:01,217 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2018-10-24 12:11:01,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:01,217 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-24 12:11:01,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:11:01,217 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-24 12:11:01,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-24 12:11:01,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:01,218 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:01,219 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:01,219 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:01,219 INFO L82 PathProgramCache]: Analyzing trace with hash -905907724, now seen corresponding path program 11 times [2018-10-24 12:11:01,219 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:01,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:01,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:01,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:01,220 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:01,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:02,148 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-24 12:11:02,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:02,149 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:02,149 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:02,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:02,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:02,149 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 12:11:02,156 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:02,156 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:02,294 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:11:02,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:02,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:02,353 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-24 12:11:02,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:02,707 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-24 12:11:02,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:02,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 31 [2018-10-24 12:11:02,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:02,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:11:02,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:11:02,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=569, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:11:02,729 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 18 states. [2018-10-24 12:11:02,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:02,890 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-10-24 12:11:02,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:11:02,890 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2018-10-24 12:11:02,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:02,891 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:11:02,892 INFO L226 Difference]: Without dead ends: 96 [2018-10-24 12:11:02,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:11:02,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-24 12:11:02,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2018-10-24 12:11:02,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-24 12:11:02,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-24 12:11:02,904 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 81 [2018-10-24 12:11:02,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:02,904 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-24 12:11:02,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:11:02,905 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-24 12:11:02,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-24 12:11:02,906 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:02,906 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:02,906 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:02,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:02,906 INFO L82 PathProgramCache]: Analyzing trace with hash 773593207, now seen corresponding path program 12 times [2018-10-24 12:11:02,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:02,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:02,907 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:02,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:02,908 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:02,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:03,133 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:03,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:03,133 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:03,134 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:03,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:03,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:03,134 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 12:11:03,141 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:03,141 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:03,218 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:03,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:03,222 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:03,266 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:03,267 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:03,691 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:03,712 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:03,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:11:03,712 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:03,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:11:03,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:11:03,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:11:03,713 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 17 states. [2018-10-24 12:11:03,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:03,922 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2018-10-24 12:11:03,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:11:03,922 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2018-10-24 12:11:03,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:03,923 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:11:03,923 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:11:03,924 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:11:03,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:11:03,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-10-24 12:11:03,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:11:03,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-24 12:11:03,935 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-24 12:11:03,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:03,935 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-24 12:11:03,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:11:03,935 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-24 12:11:03,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:11:03,937 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:03,937 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:03,937 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:03,937 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:03,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1075443694, now seen corresponding path program 13 times [2018-10-24 12:11:03,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:03,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:03,938 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:03,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:03,939 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:04,136 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:04,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:04,136 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:04,136 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:04,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:04,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:04,137 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 12:11:04,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:04,144 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:04,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:04,208 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:04,239 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:04,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:04,596 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:04,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:04,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:11:04,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:04,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:11:04,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:11:04,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:11:04,618 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 18 states. [2018-10-24 12:11:04,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:04,749 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2018-10-24 12:11:04,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:11:04,749 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2018-10-24 12:11:04,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:04,750 INFO L225 Difference]: With dead ends: 157 [2018-10-24 12:11:04,750 INFO L226 Difference]: Without dead ends: 110 [2018-10-24 12:11:04,751 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:11:04,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-24 12:11:04,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2018-10-24 12:11:04,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-24 12:11:04,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-24 12:11:04,760 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2018-10-24 12:11:04,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:04,761 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-24 12:11:04,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:11:04,761 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-24 12:11:04,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-24 12:11:04,762 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:04,763 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:04,763 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:04,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:04,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1516777111, now seen corresponding path program 14 times [2018-10-24 12:11:04,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:04,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:04,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:04,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:04,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:04,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:05,368 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-24 12:11:05,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:05,369 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:05,369 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:05,369 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:05,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:05,369 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 12:11:05,376 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:05,376 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:05,656 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:11:05,657 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:05,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:05,715 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-24 12:11:05,715 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:06,383 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-24 12:11:06,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:06,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2018-10-24 12:11:06,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:06,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:11:06,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:11:06,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:11:06,405 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 21 states. [2018-10-24 12:11:06,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:06,591 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2018-10-24 12:11:06,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:11:06,592 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2018-10-24 12:11:06,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:06,593 INFO L225 Difference]: With dead ends: 166 [2018-10-24 12:11:06,593 INFO L226 Difference]: Without dead ends: 114 [2018-10-24 12:11:06,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:11:06,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-24 12:11:06,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2018-10-24 12:11:06,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-24 12:11:06,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-24 12:11:06,607 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 99 [2018-10-24 12:11:06,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:06,607 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-24 12:11:06,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:11:06,607 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-24 12:11:06,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-24 12:11:06,608 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:06,609 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:06,609 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:06,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:06,609 INFO L82 PathProgramCache]: Analyzing trace with hash 280509428, now seen corresponding path program 15 times [2018-10-24 12:11:06,609 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:06,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:06,610 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:06,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:06,610 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:06,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:07,058 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:07,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:07,059 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:07,059 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:07,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:07,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:07,060 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 12:11:07,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:07,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:07,161 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:07,161 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:07,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:07,242 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:07,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:07,796 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:07,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:07,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:11:07,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:07,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:11:07,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:11:07,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:11:07,818 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 20 states. [2018-10-24 12:11:08,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:08,067 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2018-10-24 12:11:08,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:11:08,067 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 111 [2018-10-24 12:11:08,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:08,068 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:11:08,069 INFO L226 Difference]: Without dead ends: 121 [2018-10-24 12:11:08,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:11:08,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-24 12:11:08,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2018-10-24 12:11:08,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:11:08,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-24 12:11:08,081 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2018-10-24 12:11:08,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:08,081 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-24 12:11:08,081 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:11:08,081 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-24 12:11:08,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:11:08,082 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:08,082 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:08,082 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:08,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:08,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1179804977, now seen corresponding path program 16 times [2018-10-24 12:11:08,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:08,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:08,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:08,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:08,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:08,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:08,842 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:08,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:08,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:08,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:08,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:08,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:08,843 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 12:11:08,850 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:08,850 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:08,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:08,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:08,946 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:08,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:09,601 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:09,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:09,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:11:09,621 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:09,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:11:09,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:11:09,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:11:09,623 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 21 states. [2018-10-24 12:11:09,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:09,813 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2018-10-24 12:11:09,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:11:09,813 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2018-10-24 12:11:09,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:09,814 INFO L225 Difference]: With dead ends: 184 [2018-10-24 12:11:09,814 INFO L226 Difference]: Without dead ends: 128 [2018-10-24 12:11:09,815 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:11:09,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-24 12:11:09,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2018-10-24 12:11:09,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-24 12:11:09,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-24 12:11:09,825 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2018-10-24 12:11:09,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:09,825 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-24 12:11:09,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:11:09,825 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-24 12:11:09,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-24 12:11:09,826 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:09,827 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:09,827 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:09,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:09,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1682503148, now seen corresponding path program 17 times [2018-10-24 12:11:09,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:09,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:09,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:09,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:09,828 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:09,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-24 12:11:10,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:10,203 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:10,203 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:10,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:10,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:10,203 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 12:11:10,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:10,211 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:10,994 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-24 12:11:10,994 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:10,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:11,052 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-24 12:11:11,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:11,472 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-24 12:11:11,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:11,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 43 [2018-10-24 12:11:11,493 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:11,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:11:11,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:11:11,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=1055, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:11:11,495 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 24 states. [2018-10-24 12:11:11,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:11,691 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2018-10-24 12:11:11,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:11:11,694 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2018-10-24 12:11:11,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:11,695 INFO L225 Difference]: With dead ends: 193 [2018-10-24 12:11:11,696 INFO L226 Difference]: Without dead ends: 132 [2018-10-24 12:11:11,697 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=757, Invalid=1135, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:11:11,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-24 12:11:11,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2018-10-24 12:11:11,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-24 12:11:11,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-24 12:11:11,709 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 117 [2018-10-24 12:11:11,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:11,709 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-24 12:11:11,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:11:11,709 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-24 12:11:11,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-24 12:11:11,710 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:11,710 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:11,710 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:11,710 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:11,710 INFO L82 PathProgramCache]: Analyzing trace with hash 1944856023, now seen corresponding path program 18 times [2018-10-24 12:11:11,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:11,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:11,711 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:11,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:11,712 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:11,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:12,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:12,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:12,347 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:12,347 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:12,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:12,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:12,347 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 12:11:12,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:12,358 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:12,451 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:12,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:12,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:12,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:12,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:12,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:13,011 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:13,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:11:13,012 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:13,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:11:13,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:11:13,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:11:13,013 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 23 states. [2018-10-24 12:11:13,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:13,174 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2018-10-24 12:11:13,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:11:13,175 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 129 [2018-10-24 12:11:13,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:13,176 INFO L225 Difference]: With dead ends: 204 [2018-10-24 12:11:13,176 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:11:13,178 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:11:13,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:11:13,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-24 12:11:13,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-24 12:11:13,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-24 12:11:13,191 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-24 12:11:13,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:13,192 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-24 12:11:13,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:11:13,192 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-24 12:11:13,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-24 12:11:13,192 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:13,193 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:13,193 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:13,193 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:13,193 INFO L82 PathProgramCache]: Analyzing trace with hash 709338098, now seen corresponding path program 19 times [2018-10-24 12:11:13,193 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:13,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:13,194 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:13,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:13,194 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:13,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:13,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:13,910 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:13,910 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:13,910 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:13,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:13,910 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 12:11:13,917 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:13,917 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:14,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:14,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:14,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:14,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:14,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:14,734 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:14,734 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:11:14,734 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:14,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:11:14,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:11:14,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:11:14,736 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 24 states. [2018-10-24 12:11:14,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:14,927 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-24 12:11:14,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:11:14,930 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 132 [2018-10-24 12:11:14,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:14,931 INFO L225 Difference]: With dead ends: 211 [2018-10-24 12:11:14,931 INFO L226 Difference]: Without dead ends: 146 [2018-10-24 12:11:14,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:11:14,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-24 12:11:14,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2018-10-24 12:11:14,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-24 12:11:14,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-24 12:11:14,949 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2018-10-24 12:11:14,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:14,949 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-24 12:11:14,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:11:14,949 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-24 12:11:14,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-24 12:11:14,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:14,950 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:14,950 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:14,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:14,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1264561143, now seen corresponding path program 20 times [2018-10-24 12:11:14,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:14,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:14,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:14,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:14,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:14,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:15,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-24 12:11:15,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:15,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:15,306 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:15,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:15,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:15,306 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 12:11:15,313 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:15,314 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:16,268 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-24 12:11:16,268 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:16,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:16,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-24 12:11:16,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:16,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-24 12:11:16,931 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:16,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2018-10-24 12:11:16,931 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:16,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:11:16,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:11:16,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=1352, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:11:16,933 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 27 states. [2018-10-24 12:11:17,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:17,228 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2018-10-24 12:11:17,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:11:17,228 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2018-10-24 12:11:17,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:17,229 INFO L225 Difference]: With dead ends: 220 [2018-10-24 12:11:17,229 INFO L226 Difference]: Without dead ends: 150 [2018-10-24 12:11:17,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1006, Invalid=1444, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:11:17,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-24 12:11:17,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2018-10-24 12:11:17,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-24 12:11:17,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-24 12:11:17,246 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 135 [2018-10-24 12:11:17,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:17,247 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-24 12:11:17,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:11:17,247 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-24 12:11:17,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-24 12:11:17,248 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:17,248 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:17,248 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:17,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:17,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1991732244, now seen corresponding path program 21 times [2018-10-24 12:11:17,249 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:17,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:17,249 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:17,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:17,249 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:17,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:17,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:17,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:17,970 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:17,970 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:17,970 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:17,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:17,970 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 12:11:17,977 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:17,977 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:18,085 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:18,086 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:18,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:18,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:18,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:18,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:18,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:18,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:11:18,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:18,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:11:18,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:11:18,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:11:18,754 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 26 states. [2018-10-24 12:11:19,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:19,017 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2018-10-24 12:11:19,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:11:19,018 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 147 [2018-10-24 12:11:19,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:19,019 INFO L225 Difference]: With dead ends: 231 [2018-10-24 12:11:19,019 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:11:19,020 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 271 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 12:11:19,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:11:19,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 151. [2018-10-24 12:11:19,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-24 12:11:19,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-24 12:11:19,033 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2018-10-24 12:11:19,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:19,033 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-24 12:11:19,033 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:11:19,033 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-24 12:11:19,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-24 12:11:19,034 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:19,034 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:19,034 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:19,034 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:19,035 INFO L82 PathProgramCache]: Analyzing trace with hash -110642833, now seen corresponding path program 22 times [2018-10-24 12:11:19,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:19,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:19,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:19,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:19,035 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:19,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:20,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:20,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:20,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:20,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:20,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:20,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:20,013 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 12:11:20,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:20,021 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:20,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:20,124 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:20,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:20,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:20,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:20,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:20,825 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:11:20,825 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:20,825 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:11:20,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:11:20,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:11:20,826 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 27 states. [2018-10-24 12:11:21,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:21,041 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2018-10-24 12:11:21,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:11:21,041 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 150 [2018-10-24 12:11:21,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:21,043 INFO L225 Difference]: With dead ends: 238 [2018-10-24 12:11:21,043 INFO L226 Difference]: Without dead ends: 164 [2018-10-24 12:11:21,045 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:11:21,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-24 12:11:21,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2018-10-24 12:11:21,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-24 12:11:21,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-24 12:11:21,058 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2018-10-24 12:11:21,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:21,059 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-24 12:11:21,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:11:21,059 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-24 12:11:21,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-24 12:11:21,060 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:21,060 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:21,060 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:21,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:21,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1541515828, now seen corresponding path program 23 times [2018-10-24 12:11:21,061 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:21,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:21,062 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:21,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:21,062 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:21,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:21,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-24 12:11:21,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:21,586 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:21,586 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:21,586 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:21,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:21,586 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 12:11:21,594 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:21,594 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:25,608 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-24 12:11:25,608 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:25,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:25,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-24 12:11:25,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:26,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-24 12:11:26,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:26,622 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 55 [2018-10-24 12:11:26,622 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:26,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:11:26,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:11:26,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=1685, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:11:26,624 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 30 states. [2018-10-24 12:11:26,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:26,993 INFO L93 Difference]: Finished difference Result 247 states and 252 transitions. [2018-10-24 12:11:26,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:11:26,994 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2018-10-24 12:11:26,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:26,995 INFO L225 Difference]: With dead ends: 247 [2018-10-24 12:11:26,996 INFO L226 Difference]: Without dead ends: 168 [2018-10-24 12:11:26,997 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1291, Invalid=1789, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:11:26,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-24 12:11:27,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2018-10-24 12:11:27,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-24 12:11:27,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-24 12:11:27,012 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 153 [2018-10-24 12:11:27,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:27,012 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-24 12:11:27,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:11:27,012 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-24 12:11:27,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-24 12:11:27,013 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:27,013 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:27,013 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:27,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:27,013 INFO L82 PathProgramCache]: Analyzing trace with hash 1394469687, now seen corresponding path program 24 times [2018-10-24 12:11:27,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:27,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:27,014 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:27,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:27,014 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:27,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:27,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:27,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:27,748 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:27,748 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:27,748 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:27,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:27,748 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 12:11:27,756 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:27,756 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:27,876 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:27,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:27,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:27,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:27,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:30,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:30,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:11:30,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:30,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:11:30,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:11:30,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:11:30,543 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 29 states. [2018-10-24 12:11:30,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:30,758 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2018-10-24 12:11:30,759 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:11:30,759 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 165 [2018-10-24 12:11:30,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:30,760 INFO L225 Difference]: With dead ends: 258 [2018-10-24 12:11:30,760 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:11:30,762 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:11:30,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:11:30,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2018-10-24 12:11:30,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:11:30,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-24 12:11:30,776 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-24 12:11:30,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:30,777 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-24 12:11:30,777 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:11:30,777 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-24 12:11:30,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-24 12:11:30,777 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:30,778 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:30,778 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:30,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:30,778 INFO L82 PathProgramCache]: Analyzing trace with hash -456804398, now seen corresponding path program 25 times [2018-10-24 12:11:30,778 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:30,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:30,779 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:30,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:30,779 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:30,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:32,533 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:32,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:32,533 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:32,533 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:32,533 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:32,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:32,533 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 12:11:32,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:32,541 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:32,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:32,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:32,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:32,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:33,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:33,572 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:33,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:11:33,573 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:33,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:11:33,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:11:33,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:11:33,575 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 30 states. [2018-10-24 12:11:33,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:33,814 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2018-10-24 12:11:33,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:11:33,821 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 168 [2018-10-24 12:11:33,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:33,822 INFO L225 Difference]: With dead ends: 265 [2018-10-24 12:11:33,822 INFO L226 Difference]: Without dead ends: 182 [2018-10-24 12:11:33,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:11:33,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-24 12:11:33,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-24 12:11:33,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-24 12:11:33,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-24 12:11:33,844 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 168 [2018-10-24 12:11:33,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:33,845 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-24 12:11:33,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:11:33,845 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-24 12:11:33,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-24 12:11:33,846 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:33,846 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:33,846 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:33,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:33,847 INFO L82 PathProgramCache]: Analyzing trace with hash -88022697, now seen corresponding path program 26 times [2018-10-24 12:11:33,847 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:33,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:33,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:33,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:33,848 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:33,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:34,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-24 12:11:34,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:34,596 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:34,596 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:34,597 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:34,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:34,597 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 12:11:34,604 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:34,604 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:43,571 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-24 12:11:43,571 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:43,584 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:43,795 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-24 12:11:43,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:44,738 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-24 12:11:44,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:44,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2018-10-24 12:11:44,761 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:44,762 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:11:44,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:11:44,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:11:44,763 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 33 states. [2018-10-24 12:11:45,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:45,043 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-10-24 12:11:45,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:11:45,044 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2018-10-24 12:11:45,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:45,045 INFO L225 Difference]: With dead ends: 274 [2018-10-24 12:11:45,045 INFO L226 Difference]: Without dead ends: 186 [2018-10-24 12:11:45,046 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:11:45,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-24 12:11:45,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2018-10-24 12:11:45,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-10-24 12:11:45,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-10-24 12:11:45,071 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 171 [2018-10-24 12:11:45,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:45,071 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-10-24 12:11:45,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:11:45,071 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-10-24 12:11:45,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-24 12:11:45,072 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:45,073 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:45,073 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:45,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:45,073 INFO L82 PathProgramCache]: Analyzing trace with hash 841557044, now seen corresponding path program 27 times [2018-10-24 12:11:45,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:45,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:45,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:45,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:45,074 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:45,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:46,063 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:46,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:46,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:46,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:46,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:46,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:46,064 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 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 12:11:46,072 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:46,072 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:46,199 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:46,199 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:46,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:46,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:46,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:47,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:47,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:47,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:11:47,194 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:47,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:11:47,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:11:47,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:11:47,196 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 32 states. [2018-10-24 12:11:48,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:48,055 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2018-10-24 12:11:48,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:11:48,056 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 183 [2018-10-24 12:11:48,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:48,058 INFO L225 Difference]: With dead ends: 285 [2018-10-24 12:11:48,058 INFO L226 Difference]: Without dead ends: 193 [2018-10-24 12:11:48,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:11:48,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-24 12:11:48,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2018-10-24 12:11:48,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:11:48,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-24 12:11:48,081 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 183 [2018-10-24 12:11:48,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:48,082 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-24 12:11:48,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:11:48,082 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-24 12:11:48,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:11:48,083 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:48,083 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:48,083 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:48,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:48,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1809899505, now seen corresponding path program 28 times [2018-10-24 12:11:48,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:48,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:48,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:48,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:48,085 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:48,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:48,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:48,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:48,685 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:48,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:48,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:48,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:48,685 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 12:11:48,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:48,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:48,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:48,827 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:48,865 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:48,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:49,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:49,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:49,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:11:49,869 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:49,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:11:49,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:11:49,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:11:49,871 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 33 states. [2018-10-24 12:11:50,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:50,118 INFO L93 Difference]: Finished difference Result 292 states and 296 transitions. [2018-10-24 12:11:50,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:11:50,118 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 186 [2018-10-24 12:11:50,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:50,119 INFO L225 Difference]: With dead ends: 292 [2018-10-24 12:11:50,119 INFO L226 Difference]: Without dead ends: 200 [2018-10-24 12:11:50,120 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:11:50,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-24 12:11:50,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 190. [2018-10-24 12:11:50,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-24 12:11:50,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-24 12:11:50,138 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2018-10-24 12:11:50,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:50,138 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-24 12:11:50,138 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:11:50,138 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-24 12:11:50,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-24 12:11:50,139 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:50,139 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:50,139 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:50,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:50,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1686557268, now seen corresponding path program 29 times [2018-10-24 12:11:50,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:50,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:50,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:50,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:50,141 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:50,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:50,862 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-24 12:11:50,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:50,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:50,863 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:50,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:50,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:50,863 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 12:11:50,871 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:50,871 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:02,105 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-10-24 12:12:02,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:02,118 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:02,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-24 12:12:02,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:03,291 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-24 12:12:03,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:03,314 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 67 [2018-10-24 12:12:03,314 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:03,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:12:03,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:12:03,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1963, Invalid=2459, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:12:03,315 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 36 states. [2018-10-24 12:12:03,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:03,656 INFO L93 Difference]: Finished difference Result 301 states and 306 transitions. [2018-10-24 12:12:03,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:12:03,656 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2018-10-24 12:12:03,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:03,658 INFO L225 Difference]: With dead ends: 301 [2018-10-24 12:12:03,658 INFO L226 Difference]: Without dead ends: 204 [2018-10-24 12:12:03,660 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1969, Invalid=2587, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:12:03,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-24 12:12:03,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2018-10-24 12:12:03,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-24 12:12:03,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-24 12:12:03,686 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 189 [2018-10-24 12:12:03,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:03,686 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-24 12:12:03,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:12:03,686 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-24 12:12:03,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-24 12:12:03,688 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:03,688 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:03,688 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:03,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:03,688 INFO L82 PathProgramCache]: Analyzing trace with hash 852191383, now seen corresponding path program 30 times [2018-10-24 12:12:03,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:03,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:03,689 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:03,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:03,689 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:03,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:04,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:04,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:04,246 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:04,246 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:04,246 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:04,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:04,246 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 12:12:04,253 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:04,253 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:04,401 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:04,401 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:04,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:04,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:04,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:05,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:05,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:05,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-24 12:12:05,789 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:05,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:12:05,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:12:05,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:12:05,791 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 35 states. [2018-10-24 12:12:06,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:06,123 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2018-10-24 12:12:06,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:12:06,123 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 201 [2018-10-24 12:12:06,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:06,125 INFO L225 Difference]: With dead ends: 312 [2018-10-24 12:12:06,125 INFO L226 Difference]: Without dead ends: 211 [2018-10-24 12:12:06,126 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:12:06,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-24 12:12:06,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-10-24 12:12:06,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-24 12:12:06,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2018-10-24 12:12:06,154 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 201 [2018-10-24 12:12:06,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:06,155 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2018-10-24 12:12:06,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:12:06,155 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2018-10-24 12:12:06,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:12:06,156 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:06,156 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:06,156 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:06,157 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:06,157 INFO L82 PathProgramCache]: Analyzing trace with hash -535149646, now seen corresponding path program 31 times [2018-10-24 12:12:06,157 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:06,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:06,158 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:06,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:06,158 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:06,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:07,668 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:07,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:07,668 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:07,669 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:07,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:07,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:07,669 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 12:12:07,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:07,676 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:07,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:07,826 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:07,871 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:07,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:09,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:09,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-24 12:12:09,319 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:09,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:12:09,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:12:09,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:12:09,321 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand 36 states. [2018-10-24 12:12:09,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:09,711 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2018-10-24 12:12:09,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:12:09,711 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 204 [2018-10-24 12:12:09,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:09,712 INFO L225 Difference]: With dead ends: 319 [2018-10-24 12:12:09,712 INFO L226 Difference]: Without dead ends: 218 [2018-10-24 12:12:09,713 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:12:09,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-24 12:12:09,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 208. [2018-10-24 12:12:09,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-24 12:12:09,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2018-10-24 12:12:09,740 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 204 [2018-10-24 12:12:09,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:09,741 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2018-10-24 12:12:09,741 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:12:09,741 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2018-10-24 12:12:09,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-24 12:12:09,742 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:09,742 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:09,743 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:09,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:09,743 INFO L82 PathProgramCache]: Analyzing trace with hash -341455177, now seen corresponding path program 32 times [2018-10-24 12:12:09,743 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:09,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:09,743 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:09,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:09,744 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:09,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:10,813 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-24 12:12:10,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:10,813 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:10,813 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:10,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:10,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:10,813 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 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 12:12:10,820 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:10,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:28,000 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-24 12:12:28,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:28,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:28,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-24 12:12:28,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:29,551 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-24 12:12:29,575 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:29,576 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2018-10-24 12:12:29,576 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:29,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:12:29,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:12:29,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2356, Invalid=2900, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:12:29,577 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand 39 states. [2018-10-24 12:12:29,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:29,868 INFO L93 Difference]: Finished difference Result 328 states and 333 transitions. [2018-10-24 12:12:29,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:12:29,869 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 207 [2018-10-24 12:12:29,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:29,870 INFO L225 Difference]: With dead ends: 328 [2018-10-24 12:12:29,871 INFO L226 Difference]: Without dead ends: 222 [2018-10-24 12:12:29,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2362, Invalid=3040, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:12:29,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-24 12:12:29,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-10-24 12:12:29,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-24 12:12:29,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-24 12:12:29,904 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 207 [2018-10-24 12:12:29,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:29,904 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-24 12:12:29,905 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:12:29,905 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-24 12:12:29,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-24 12:12:29,906 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:29,906 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:29,906 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:29,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:29,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1617730476, now seen corresponding path program 33 times [2018-10-24 12:12:29,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:29,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:29,907 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:29,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:29,908 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:29,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:30,560 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:30,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:30,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:30,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:30,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:30,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:30,561 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 12:12:30,567 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:30,567 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:30,724 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:30,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:30,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:30,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:30,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:32,316 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:32,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:32,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-24 12:12:32,337 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:32,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:12:32,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:12:32,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:12:32,338 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 38 states. [2018-10-24 12:12:32,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:32,683 INFO L93 Difference]: Finished difference Result 339 states and 342 transitions. [2018-10-24 12:12:32,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:12:32,684 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 219 [2018-10-24 12:12:32,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:32,685 INFO L225 Difference]: With dead ends: 339 [2018-10-24 12:12:32,685 INFO L226 Difference]: Without dead ends: 229 [2018-10-24 12:12:32,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 403 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 12:12:32,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-24 12:12:32,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 223. [2018-10-24 12:12:32,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-24 12:12:32,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2018-10-24 12:12:32,711 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 219 [2018-10-24 12:12:32,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:32,711 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2018-10-24 12:12:32,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:12:32,711 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2018-10-24 12:12:32,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:12:32,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:32,712 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:32,713 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:32,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:32,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1207553711, now seen corresponding path program 34 times [2018-10-24 12:12:32,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:32,713 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:32,713 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:32,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:32,714 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:32,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:34,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:34,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:34,839 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:34,839 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:34,839 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:34,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:34,839 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 12:12:34,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:34,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:35,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:35,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:35,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:35,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:36,561 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:36,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:36,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-24 12:12:36,583 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:36,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:12:36,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:12:36,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:12:36,584 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand 39 states. [2018-10-24 12:12:36,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:36,960 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2018-10-24 12:12:36,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:12:36,960 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 222 [2018-10-24 12:12:36,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:36,961 INFO L225 Difference]: With dead ends: 346 [2018-10-24 12:12:36,961 INFO L226 Difference]: Without dead ends: 236 [2018-10-24 12:12:36,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:12:36,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-10-24 12:12:36,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2018-10-24 12:12:36,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-24 12:12:36,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2018-10-24 12:12:36,986 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2018-10-24 12:12:36,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:36,987 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2018-10-24 12:12:36,987 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:12:36,987 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2018-10-24 12:12:36,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-24 12:12:36,988 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:36,988 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:36,988 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:36,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:36,989 INFO L82 PathProgramCache]: Analyzing trace with hash 774668916, now seen corresponding path program 35 times [2018-10-24 12:12:36,989 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:36,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:36,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:36,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:36,990 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:37,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:37,690 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-24 12:12:37,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:37,690 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:37,690 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:37,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:37,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:37,691 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 12:12:37,697 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:37,697 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:59,684 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-24 12:12:59,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:59,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:59,801 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-24 12:12:59,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:01,300 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-24 12:13:01,324 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:01,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 79 [2018-10-24 12:13:01,325 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:01,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:13:01,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:13:01,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2785, Invalid=3377, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:13:01,326 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand 42 states. [2018-10-24 12:13:01,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:01,694 INFO L93 Difference]: Finished difference Result 355 states and 360 transitions. [2018-10-24 12:13:01,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:13:01,695 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-24 12:13:01,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:01,697 INFO L225 Difference]: With dead ends: 355 [2018-10-24 12:13:01,697 INFO L226 Difference]: Without dead ends: 240 [2018-10-24 12:13:01,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2791, Invalid=3529, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:13:01,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-24 12:13:01,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2018-10-24 12:13:01,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2018-10-24 12:13:01,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2018-10-24 12:13:01,734 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 225 [2018-10-24 12:13:01,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:01,735 INFO L481 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2018-10-24 12:13:01,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:13:01,735 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2018-10-24 12:13:01,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-24 12:13:01,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:01,736 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:01,737 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:01,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:01,737 INFO L82 PathProgramCache]: Analyzing trace with hash -74539529, now seen corresponding path program 36 times [2018-10-24 12:13:01,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:01,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:01,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:01,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:01,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:01,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:02,600 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:02,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:02,601 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:02,601 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:02,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:02,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:02,601 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 12:13:02,609 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:02,609 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:02,778 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:02,778 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:02,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:02,890 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:02,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:04,838 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:04,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:04,859 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-24 12:13:04,859 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:04,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:13:04,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:13:04,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:13:04,861 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand 41 states. [2018-10-24 12:13:05,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:05,223 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2018-10-24 12:13:05,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:13:05,224 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 237 [2018-10-24 12:13:05,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:05,225 INFO L225 Difference]: With dead ends: 366 [2018-10-24 12:13:05,225 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:13:05,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:13:05,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:13:05,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 241. [2018-10-24 12:13:05,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-10-24 12:13:05,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 242 transitions. [2018-10-24 12:13:05,253 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 242 transitions. Word has length 237 [2018-10-24 12:13:05,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:05,253 INFO L481 AbstractCegarLoop]: Abstraction has 241 states and 242 transitions. [2018-10-24 12:13:05,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:13:05,253 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 242 transitions. [2018-10-24 12:13:05,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-10-24 12:13:05,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:05,255 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:05,255 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:05,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:05,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1048528786, now seen corresponding path program 37 times [2018-10-24 12:13:05,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:05,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:05,256 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:05,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:05,256 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:05,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:06,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:06,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:06,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:06,061 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:06,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:06,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:06,061 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 12:13:06,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:06,075 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:06,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:06,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:06,304 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:06,304 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:08,507 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:08,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:08,528 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-24 12:13:08,528 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:08,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:13:08,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:13:08,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:13:08,530 INFO L87 Difference]: Start difference. First operand 241 states and 242 transitions. Second operand 42 states. [2018-10-24 12:13:08,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:08,957 INFO L93 Difference]: Finished difference Result 373 states and 377 transitions. [2018-10-24 12:13:08,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:13:08,957 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 240 [2018-10-24 12:13:08,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:08,958 INFO L225 Difference]: With dead ends: 373 [2018-10-24 12:13:08,958 INFO L226 Difference]: Without dead ends: 254 [2018-10-24 12:13:08,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:13:08,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-24 12:13:08,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 244. [2018-10-24 12:13:08,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-10-24 12:13:08,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 245 transitions. [2018-10-24 12:13:08,996 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 245 transitions. Word has length 240 [2018-10-24 12:13:08,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:08,996 INFO L481 AbstractCegarLoop]: Abstraction has 244 states and 245 transitions. [2018-10-24 12:13:08,996 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:13:08,997 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 245 transitions. [2018-10-24 12:13:08,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-10-24 12:13:08,998 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:08,998 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:08,998 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:08,998 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:08,999 INFO L82 PathProgramCache]: Analyzing trace with hash 581465111, now seen corresponding path program 38 times [2018-10-24 12:13:08,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:08,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:08,999 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:09,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:09,000 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:09,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:10,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-24 12:13:10,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:10,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:10,115 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:10,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:10,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:10,115 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 12:13:10,123 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:10,123 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:13:42,819 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-24 12:13:42,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:42,838 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:42,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-24 12:13:42,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:44,633 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-24 12:13:44,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:44,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 85 [2018-10-24 12:13:44,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:44,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:13:44,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:13:44,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=3890, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:13:44,660 INFO L87 Difference]: Start difference. First operand 244 states and 245 transitions. Second operand 45 states. [2018-10-24 12:13:45,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:45,336 INFO L93 Difference]: Finished difference Result 382 states and 387 transitions. [2018-10-24 12:13:45,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:13:45,336 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 243 [2018-10-24 12:13:45,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:45,338 INFO L225 Difference]: With dead ends: 382 [2018-10-24 12:13:45,339 INFO L226 Difference]: Without dead ends: 258 [2018-10-24 12:13:45,340 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3256, Invalid=4054, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:13:45,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-10-24 12:13:45,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2018-10-24 12:13:45,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2018-10-24 12:13:45,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 257 transitions. [2018-10-24 12:13:45,375 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 257 transitions. Word has length 243 [2018-10-24 12:13:45,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:45,375 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 257 transitions. [2018-10-24 12:13:45,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:13:45,376 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 257 transitions. [2018-10-24 12:13:45,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-24 12:13:45,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:45,377 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:45,377 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:45,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:45,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1711526796, now seen corresponding path program 39 times [2018-10-24 12:13:45,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:45,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:45,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:45,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:45,379 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:45,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:46,219 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:46,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:46,219 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:46,219 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:46,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:46,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:46,220 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:46,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:13:46,228 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:13:46,405 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:13:46,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:13:46,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:46,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:46,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:48,241 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:48,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:48,263 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-24 12:13:48,263 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:48,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:13:48,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:13:48,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:13:48,264 INFO L87 Difference]: Start difference. First operand 256 states and 257 transitions. Second operand 44 states. [2018-10-24 12:13:48,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:48,736 INFO L93 Difference]: Finished difference Result 393 states and 396 transitions. [2018-10-24 12:13:48,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:13:48,737 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 255 [2018-10-24 12:13:48,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:48,738 INFO L225 Difference]: With dead ends: 393 [2018-10-24 12:13:48,738 INFO L226 Difference]: Without dead ends: 265 [2018-10-24 12:13:48,739 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:13:48,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-24 12:13:48,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 259. [2018-10-24 12:13:48,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-24 12:13:48,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-24 12:13:48,780 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 255 [2018-10-24 12:13:48,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:48,780 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-24 12:13:48,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:13:48,780 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-24 12:13:48,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-24 12:13:48,782 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:48,782 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:48,782 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:48,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:48,782 INFO L82 PathProgramCache]: Analyzing trace with hash 27116879, now seen corresponding path program 40 times [2018-10-24 12:13:48,783 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:48,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:48,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:13:48,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:48,783 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:48,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:49,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:49,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:49,624 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:49,624 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:49,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:49,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:49,624 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:49,631 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:49,632 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:13:49,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:49,817 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:13:49,969 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:49,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:13:52,033 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:52,053 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:13:52,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-24 12:13:52,054 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:13:52,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:13:52,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:13:52,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:13:52,055 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 45 states. [2018-10-24 12:13:52,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:13:52,527 INFO L93 Difference]: Finished difference Result 400 states and 404 transitions. [2018-10-24 12:13:52,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:13:52,527 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 258 [2018-10-24 12:13:52,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:13:52,528 INFO L225 Difference]: With dead ends: 400 [2018-10-24 12:13:52,529 INFO L226 Difference]: Without dead ends: 272 [2018-10-24 12:13:52,529 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:13:52,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2018-10-24 12:13:52,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 262. [2018-10-24 12:13:52,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-24 12:13:52,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2018-10-24 12:13:52,557 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2018-10-24 12:13:52,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:13:52,557 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2018-10-24 12:13:52,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:13:52,557 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2018-10-24 12:13:52,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-24 12:13:52,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:13:52,559 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:13:52,559 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:13:52,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:13:52,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1344750956, now seen corresponding path program 41 times [2018-10-24 12:13:52,560 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:13:52,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:52,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:13:52,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:13:52,561 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:13:52,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:13:53,418 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-24 12:13:53,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:53,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:13:53,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:13:53,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:13:53,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:13:53,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:13:53,425 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:13:53,425 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:14:38,012 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-24 12:14:38,012 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:38,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:38,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-24 12:14:38,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:40,211 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-24 12:14:40,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:40,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 91 [2018-10-24 12:14:40,240 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:40,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:14:40,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:14:40,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4439, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:14:40,242 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand 48 states. [2018-10-24 12:14:40,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:40,640 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-10-24 12:14:40,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:14:40,641 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 261 [2018-10-24 12:14:40,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:40,642 INFO L225 Difference]: With dead ends: 409 [2018-10-24 12:14:40,642 INFO L226 Difference]: Without dead ends: 276 [2018-10-24 12:14:40,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3757, Invalid=4615, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:14:40,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-24 12:14:40,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 274. [2018-10-24 12:14:40,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-24 12:14:40,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2018-10-24 12:14:40,684 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 261 [2018-10-24 12:14:40,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:40,684 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2018-10-24 12:14:40,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:14:40,684 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2018-10-24 12:14:40,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-24 12:14:40,685 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:40,686 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:40,686 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:40,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:40,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1216246953, now seen corresponding path program 42 times [2018-10-24 12:14:40,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:40,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:40,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:40,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:40,687 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:40,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:42,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:42,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:42,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:42,441 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:42,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:42,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:42,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:42,448 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:14:42,448 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:14:42,649 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:14:42,649 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:14:42,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:42,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:42,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:44,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:44,784 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:44,784 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-24 12:14:44,785 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:44,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:14:44,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:14:44,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:14:44,787 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand 47 states. [2018-10-24 12:14:45,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:45,286 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2018-10-24 12:14:45,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:14:45,287 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 273 [2018-10-24 12:14:45,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:45,288 INFO L225 Difference]: With dead ends: 420 [2018-10-24 12:14:45,288 INFO L226 Difference]: Without dead ends: 283 [2018-10-24 12:14:45,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:14:45,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-24 12:14:45,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 277. [2018-10-24 12:14:45,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-24 12:14:45,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-24 12:14:45,334 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 273 [2018-10-24 12:14:45,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:45,334 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-24 12:14:45,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:14:45,334 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-24 12:14:45,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-24 12:14:45,336 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:45,336 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:45,336 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:45,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:45,336 INFO L82 PathProgramCache]: Analyzing trace with hash -206650510, now seen corresponding path program 43 times [2018-10-24 12:14:45,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:45,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:45,337 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:14:45,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:45,337 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:45,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:46,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:46,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:46,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:46,408 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:46,408 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:46,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:46,408 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:46,419 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:46,420 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:14:46,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:46,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:14:46,682 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:46,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:14:49,154 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:49,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:14:49,177 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-24 12:14:49,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:14:49,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:14:49,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:14:49,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:14:49,179 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 48 states. [2018-10-24 12:14:49,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:14:49,778 INFO L93 Difference]: Finished difference Result 427 states and 431 transitions. [2018-10-24 12:14:49,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:14:49,778 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 276 [2018-10-24 12:14:49,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:14:49,780 INFO L225 Difference]: With dead ends: 427 [2018-10-24 12:14:49,780 INFO L226 Difference]: Without dead ends: 290 [2018-10-24 12:14:49,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-24 12:14:49,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-24 12:14:49,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 280. [2018-10-24 12:14:49,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-24 12:14:49,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 281 transitions. [2018-10-24 12:14:49,821 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 281 transitions. Word has length 276 [2018-10-24 12:14:49,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:14:49,821 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 281 transitions. [2018-10-24 12:14:49,821 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:14:49,821 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 281 transitions. [2018-10-24 12:14:49,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-10-24 12:14:49,823 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:14:49,823 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:14:49,823 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:14:49,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:14:49,824 INFO L82 PathProgramCache]: Analyzing trace with hash -974990985, now seen corresponding path program 44 times [2018-10-24 12:14:49,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:14:49,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:49,825 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:14:49,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:14:49,825 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:14:49,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:14:50,815 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-24 12:14:50,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:50,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:14:50,816 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:14:50,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:14:50,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:14:50,816 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:14:50,823 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:14:50,824 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