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-lit/gr2006_true-unreach-call_true-termination.c.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:08:51,379 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:08:51,382 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:08:51,398 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:08:51,398 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:08:51,399 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:08:51,401 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:08:51,403 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:08:51,406 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:08:51,406 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:08:51,408 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:08:51,409 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:08:51,409 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:08:51,411 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:08:51,420 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:08:51,421 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:08:51,421 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:08:51,426 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:08:51,431 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:08:51,433 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:08:51,435 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:08:51,437 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:08:51,439 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:08:51,440 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:08:51,442 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:08:51,443 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:08:51,444 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:08:51,445 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:08:51,446 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:08:51,449 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:08:51,450 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:08:51,450 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:08:51,454 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 [2018-10-22 16:08:51,484 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:08:51,484 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:08:51,485 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:08:51,485 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:08:51,485 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:08:51,486 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:08:51,489 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:08:51,489 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:08:51,489 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:08:51,489 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:08:51,490 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:08:51,490 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:08:51,491 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:08:51,492 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:08:51,492 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:08:51,492 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:08:51,492 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:08:51,492 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:08:51,493 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:08:51,493 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:08:51,493 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:08:51,494 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:08:51,494 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:08:51,494 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:08:51,494 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:08:51,494 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:08:51,495 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:08:51,495 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:08:51,495 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:08:51,495 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:08:51,496 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:08:51,496 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:08:51,496 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:08:51,496 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:08:51,538 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:08:51,555 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:08:51,559 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:08:51,561 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:08:51,561 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:08:51,562 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-10-22 16:08:51,622 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2777ed93a/166a2c1b4fc94aac9b70ee328a1ab87a/FLAG59412351c [2018-10-22 16:08:52,076 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:08:52,077 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-10-22 16:08:52,083 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2777ed93a/166a2c1b4fc94aac9b70ee328a1ab87a/FLAG59412351c [2018-10-22 16:08:52,098 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2777ed93a/166a2c1b4fc94aac9b70ee328a1ab87a [2018-10-22 16:08:52,108 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:08:52,110 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:08:52,111 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:08:52,111 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:08:52,114 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:08:52,115 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a243cfd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52, skipping insertion in model container [2018-10-22 16:08:52,118 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,128 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:08:52,147 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:08:52,333 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:08:52,336 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:08:52,354 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:08:52,370 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:08:52,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52 WrapperNode [2018-10-22 16:08:52,371 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:08:52,372 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:08:52,372 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:08:52,372 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:08:52,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,388 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,395 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:08:52,395 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:08:52,395 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:08:52,396 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:08:52,406 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,407 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,408 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,411 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,418 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (1/1) ... [2018-10-22 16:08:52,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:08:52,421 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:08:52,421 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:08:52,421 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:08:52,422 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (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 [2018-10-22 16:08:52,483 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:08:52,483 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:08:52,484 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:08:52,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:08:52,484 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:08:52,484 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:08:52,484 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:08:52,484 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:08:52,764 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:08:52,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:08:52 BoogieIcfgContainer [2018-10-22 16:08:52,765 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:08:52,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:08:52,767 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:08:52,780 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:08:52,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:08:52" (1/3) ... [2018-10-22 16:08:52,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30e013f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:08:52, skipping insertion in model container [2018-10-22 16:08:52,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:08:52" (2/3) ... [2018-10-22 16:08:52,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30e013f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:08:52, skipping insertion in model container [2018-10-22 16:08:52,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:08:52" (3/3) ... [2018-10-22 16:08:52,791 INFO L112 eAbstractionObserver]: Analyzing ICFG gr2006_true-unreach-call_true-termination.c.i [2018-10-22 16:08:52,816 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:08:52,830 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:08:52,859 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:08:52,914 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:08:52,914 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:08:52,914 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:08:52,914 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:08:52,915 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:08:52,915 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:08:52,915 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:08:52,915 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:08:52,915 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:08:52,933 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-22 16:08:52,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:08:52,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:52,949 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:52,953 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:52,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:52,959 INFO L82 PathProgramCache]: Analyzing trace with hash -859010367, now seen corresponding path program 1 times [2018-10-22 16:08:52,961 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:53,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,010 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:53,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:53,064 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:08:53,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:08:53,065 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:08:53,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:08:53,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:08:53,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:08:53,083 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-22 16:08:53,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:53,105 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2018-10-22 16:08:53,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:08:53,106 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:08:53,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:53,114 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:08:53,115 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 16:08:53,118 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 [2018-10-22 16:08:53,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 16:08:53,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 16:08:53,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 16:08:53,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-10-22 16:08:53,159 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-10-22 16:08:53,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:53,159 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-10-22 16:08:53,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:08:53,160 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-10-22 16:08:53,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:08:53,160 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:53,161 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:53,161 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:53,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:53,162 INFO L82 PathProgramCache]: Analyzing trace with hash 220608140, now seen corresponding path program 1 times [2018-10-22 16:08:53,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:53,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,165 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:53,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:53,267 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:08:53,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-10-22 16:08:53,267 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:08:53,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:08:53,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:08:53,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-22 16:08:53,270 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 4 states. [2018-10-22 16:08:53,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:53,333 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-10-22 16:08:53,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:08:53,334 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-22 16:08:53,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:53,335 INFO L225 Difference]: With dead ends: 24 [2018-10-22 16:08:53,335 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:08:53,336 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-22 16:08:53,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:08:53,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 16:08:53,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:08:53,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-10-22 16:08:53,342 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2018-10-22 16:08:53,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:53,343 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-10-22 16:08:53,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:08:53,343 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-10-22 16:08:53,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:08:53,344 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:53,344 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:53,344 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:53,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:53,345 INFO L82 PathProgramCache]: Analyzing trace with hash 277866442, now seen corresponding path program 1 times [2018-10-22 16:08:53,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:53,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,347 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:53,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:08:53,391 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:08:53,392 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:08:53,392 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:08:53,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:08:53,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:08:53,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:08:53,393 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2018-10-22 16:08:53,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:53,428 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2018-10-22 16:08:53,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:08:53,430 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-22 16:08:53,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:53,431 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:08:53,431 INFO L226 Difference]: Without dead ends: 23 [2018-10-22 16:08:53,432 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 [2018-10-22 16:08:53,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-22 16:08:53,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2018-10-22 16:08:53,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:08:53,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-10-22 16:08:53,437 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2018-10-22 16:08:53,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:53,437 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-10-22 16:08:53,438 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:08:53,438 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-10-22 16:08:53,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 16:08:53,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:53,439 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:53,439 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:53,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:53,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1383636324, now seen corresponding path program 1 times [2018-10-22 16:08:53,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:53,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:53,442 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:53,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,501 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:53,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,503 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:53,504 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-10-22 16:08:53,506 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [14], [17], [19], [23], [25], [32], [35], [37], [43], [44], [45], [47] [2018-10-22 16:08:53,563 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:08:53,564 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:08:53,875 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:08:53,876 INFO L272 AbstractInterpreter]: Visited 15 different actions 79 times. Merged at 6 different actions 40 times. Widened at 1 different actions 5 times. Found 5 fixpoints after 2 different actions. Largest state had 5 variables. [2018-10-22 16:08:53,905 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:53,906 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:08:53,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,906 INFO L197 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 [2018-10-22 16:08:53,916 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:53,916 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:53,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:53,968 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:53,969 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:54,027 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,056 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:54,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:54,072 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:54,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:54,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:54,116 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,116 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:54,158 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:54,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:08:54,161 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:54,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:08:54,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:08:54,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:08:54,163 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2018-10-22 16:08:54,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:54,258 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2018-10-22 16:08:54,260 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:08:54,260 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2018-10-22 16:08:54,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:54,262 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:08:54,262 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 16:08:54,263 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:08:54,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 16:08:54,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-22 16:08:54,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:08:54,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-10-22 16:08:54,272 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2018-10-22 16:08:54,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:54,273 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-10-22 16:08:54,273 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:08:54,274 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-10-22 16:08:54,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 16:08:54,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:54,275 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:54,275 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:54,275 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:54,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1112171374, now seen corresponding path program 2 times [2018-10-22 16:08:54,277 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:54,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:54,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:54,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:54,278 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:54,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:54,461 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:54,462 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:54,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:54,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,463 INFO L197 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) [2018-10-22 16:08:54,479 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:54,479 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:54,515 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:54,515 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:54,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:54,524 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,525 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:54,611 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,636 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:54,652 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:54,652 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:54,677 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:54,677 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:54,681 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:54,687 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:54,725 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:54,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:08:54,727 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:54,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:08:54,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:08:54,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:08:54,729 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-10-22 16:08:54,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:54,775 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2018-10-22 16:08:54,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:08:54,775 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-22 16:08:54,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:54,776 INFO L225 Difference]: With dead ends: 45 [2018-10-22 16:08:54,776 INFO L226 Difference]: Without dead ends: 31 [2018-10-22 16:08:54,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:08:54,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-22 16:08:54,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-22 16:08:54,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:08:54,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-22 16:08:54,782 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2018-10-22 16:08:54,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:54,783 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-22 16:08:54,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:08:54,783 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-22 16:08:54,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:08:54,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:54,784 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:54,785 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:54,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:54,785 INFO L82 PathProgramCache]: Analyzing trace with hash 920868032, now seen corresponding path program 3 times [2018-10-22 16:08:54,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:54,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:54,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:54,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:54,787 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:54,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:54,948 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:54,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,949 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:54,949 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:54,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:54,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:54,949 INFO L197 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 [2018-10-22 16:08:54,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:54,966 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:55,009 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-22 16:08:55,009 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:55,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,018 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,121 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,143 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:55,159 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:55,160 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:55,193 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-22 16:08:55,194 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:55,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,204 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,229 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:55,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:08:55,231 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:55,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:08:55,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:08:55,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:08:55,233 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 6 states. [2018-10-22 16:08:55,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:55,279 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-22 16:08:55,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:08:55,281 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2018-10-22 16:08:55,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:55,282 INFO L225 Difference]: With dead ends: 49 [2018-10-22 16:08:55,282 INFO L226 Difference]: Without dead ends: 35 [2018-10-22 16:08:55,283 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:08:55,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-22 16:08:55,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2018-10-22 16:08:55,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 16:08:55,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2018-10-22 16:08:55,290 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2018-10-22 16:08:55,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:55,290 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2018-10-22 16:08:55,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:08:55,291 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2018-10-22 16:08:55,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 16:08:55,292 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:55,292 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:55,292 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:55,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:55,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1962755566, now seen corresponding path program 4 times [2018-10-22 16:08:55,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:55,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:55,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,294 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:55,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:55,375 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,376 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:55,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:55,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:55,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,376 INFO L197 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 [2018-10-22 16:08:55,384 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:55,384 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:55,428 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:55,428 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:55,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,438 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,789 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:55,810 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:55,825 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:55,826 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:55,852 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:55,852 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:55,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,863 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:55,874 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:55,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:55,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:08:55,877 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:55,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:08:55,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:08:55,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:08:55,878 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 7 states. [2018-10-22 16:08:55,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:55,928 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2018-10-22 16:08:55,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:08:55,928 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2018-10-22 16:08:55,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:55,929 INFO L225 Difference]: With dead ends: 53 [2018-10-22 16:08:55,929 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 16:08:55,930 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:08:55,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 16:08:55,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-22 16:08:55,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 16:08:55,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-22 16:08:55,935 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2018-10-22 16:08:55,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:55,936 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-22 16:08:55,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:08:55,936 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-22 16:08:55,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 16:08:55,937 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:55,937 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:55,938 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:55,938 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:55,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1161752604, now seen corresponding path program 5 times [2018-10-22 16:08:55,938 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:55,939 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,939 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:55,940 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:55,940 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:55,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:56,223 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:56,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,223 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:56,223 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:56,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:56,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,224 INFO L197 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 [2018-10-22 16:08:56,232 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:56,232 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:56,255 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:08:56,255 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:56,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:56,265 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:56,266 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:56,458 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:56,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,479 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:56,496 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:56,496 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:56,538 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:08:56,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:56,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:56,549 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:56,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:56,601 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:56,603 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:56,603 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:08:56,603 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:56,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:08:56,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:08:56,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:08:56,607 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 8 states. [2018-10-22 16:08:56,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:56,690 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2018-10-22 16:08:56,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:08:56,691 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 37 [2018-10-22 16:08:56,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:56,692 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:08:56,692 INFO L226 Difference]: Without dead ends: 43 [2018-10-22 16:08:56,693 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:08:56,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-22 16:08:56,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-22 16:08:56,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:08:56,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2018-10-22 16:08:56,698 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2018-10-22 16:08:56,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:56,699 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2018-10-22 16:08:56,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:08:56,699 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2018-10-22 16:08:56,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:08:56,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:56,700 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:56,700 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:56,701 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:56,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1797509962, now seen corresponding path program 6 times [2018-10-22 16:08:56,701 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:56,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:56,702 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:56,702 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:56,702 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:56,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:56,814 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:56,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,815 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:56,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:56,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:56,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:56,815 INFO L197 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 [2018-10-22 16:08:56,823 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:56,824 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:56,844 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:08:56,844 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:56,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:56,997 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 100 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-10-22 16:08:56,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:57,159 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 100 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-10-22 16:08:57,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:57,181 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:57,197 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:57,198 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:57,259 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:08:57,259 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:57,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:57,270 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:57,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:57,453 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:08:57,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:57,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 27 [2018-10-22 16:08:57,455 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:57,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:08:57,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:08:57,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=505, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:08:57,457 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 16 states. [2018-10-22 16:08:57,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:57,944 INFO L93 Difference]: Finished difference Result 106 states and 126 transitions. [2018-10-22 16:08:57,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:08:57,945 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2018-10-22 16:08:57,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:57,947 INFO L225 Difference]: With dead ends: 106 [2018-10-22 16:08:57,947 INFO L226 Difference]: Without dead ends: 92 [2018-10-22 16:08:57,949 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 142 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=488, Invalid=1072, Unknown=0, NotChecked=0, Total=1560 [2018-10-22 16:08:57,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-22 16:08:57,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 66. [2018-10-22 16:08:57,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-22 16:08:57,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 73 transitions. [2018-10-22 16:08:57,957 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 73 transitions. Word has length 41 [2018-10-22 16:08:57,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:57,958 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 73 transitions. [2018-10-22 16:08:57,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:08:57,958 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 73 transitions. [2018-10-22 16:08:57,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-22 16:08:57,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:57,960 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:57,960 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:57,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:57,960 INFO L82 PathProgramCache]: Analyzing trace with hash 710909332, now seen corresponding path program 7 times [2018-10-22 16:08:57,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:57,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:57,961 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:57,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:57,962 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:57,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:58,101 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,102 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:58,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:58,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:58,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,102 INFO L197 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 [2018-10-22 16:08:58,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:58,112 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:58,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:58,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:58,149 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:58,336 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,359 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:58,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:58,374 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:58,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:58,417 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:58,425 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:58,483 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:58,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:08:58,486 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:58,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:08:58,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:08:58,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:08:58,488 INFO L87 Difference]: Start difference. First operand 66 states and 73 transitions. Second operand 10 states. [2018-10-22 16:08:58,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:58,711 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-10-22 16:08:58,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:08:58,712 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 65 [2018-10-22 16:08:58,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:58,713 INFO L225 Difference]: With dead ends: 105 [2018-10-22 16:08:58,713 INFO L226 Difference]: Without dead ends: 71 [2018-10-22 16:08:58,714 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:08:58,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-10-22 16:08:58,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2018-10-22 16:08:58,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-22 16:08:58,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2018-10-22 16:08:58,722 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 65 [2018-10-22 16:08:58,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:58,722 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2018-10-22 16:08:58,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:08:58,723 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2018-10-22 16:08:58,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-22 16:08:58,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:58,724 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 14, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:58,724 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:58,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:58,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1774383166, now seen corresponding path program 8 times [2018-10-22 16:08:58,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:58,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:58,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:58,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:58,726 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:58,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:58,858 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,858 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:58,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:58,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:58,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,859 INFO L197 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 [2018-10-22 16:08:58,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:58,866 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:58,894 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:58,894 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:58,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:58,909 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:58,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:59,520 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:59,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:59,542 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:59,557 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:59,558 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:59,608 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:59,608 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:59,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:59,626 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:59,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:59,699 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:08:59,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:59,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:08:59,702 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:59,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:08:59,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:08:59,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:08:59,704 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand 11 states. [2018-10-22 16:08:59,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:59,777 INFO L93 Difference]: Finished difference Result 109 states and 124 transitions. [2018-10-22 16:08:59,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:08:59,780 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 69 [2018-10-22 16:08:59,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:59,781 INFO L225 Difference]: With dead ends: 109 [2018-10-22 16:08:59,781 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:08:59,782 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:08:59,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:08:59,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-22 16:08:59,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-22 16:08:59,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 81 transitions. [2018-10-22 16:08:59,790 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 81 transitions. Word has length 69 [2018-10-22 16:08:59,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:59,790 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 81 transitions. [2018-10-22 16:08:59,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:08:59,791 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 81 transitions. [2018-10-22 16:08:59,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-22 16:08:59,793 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:59,794 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 15, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:59,794 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:59,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:59,795 INFO L82 PathProgramCache]: Analyzing trace with hash 345619184, now seen corresponding path program 9 times [2018-10-22 16:08:59,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:59,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:59,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:59,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:59,796 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:59,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:00,127 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 243 proven. 171 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:09:00,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:00,128 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:00,128 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:00,128 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:00,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:00,128 INFO L197 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 [2018-10-22 16:09:00,154 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:00,155 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:00,208 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:09:00,208 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:00,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:00,452 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 298 proven. 157 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2018-10-22 16:09:00,453 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:01,838 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 298 proven. 157 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2018-10-22 16:09:01,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:01,859 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:01,874 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:01,874 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:01,987 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:09:01,987 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:01,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:01,999 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 243 proven. 171 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:09:01,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:02,276 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 243 proven. 171 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:09:02,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:02,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 34 [2018-10-22 16:09:02,278 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:02,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:09:02,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:09:02,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:02,279 INFO L87 Difference]: Start difference. First operand 74 states and 81 transitions. Second operand 22 states. [2018-10-22 16:09:02,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:02,694 INFO L93 Difference]: Finished difference Result 200 states and 239 transitions. [2018-10-22 16:09:02,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:09:02,695 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 73 [2018-10-22 16:09:02,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:02,696 INFO L225 Difference]: With dead ends: 200 [2018-10-22 16:09:02,696 INFO L226 Difference]: Without dead ends: 166 [2018-10-22 16:09:02,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 256 SyntacticMatches, 14 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=823, Invalid=1933, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:09:02,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-22 16:09:02,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 90. [2018-10-22 16:09:02,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:09:02,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 100 transitions. [2018-10-22 16:09:02,710 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 100 transitions. Word has length 73 [2018-10-22 16:09:02,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:02,711 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 100 transitions. [2018-10-22 16:09:02,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:09:02,711 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 100 transitions. [2018-10-22 16:09:02,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:09:02,713 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:02,713 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:02,713 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:02,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:02,713 INFO L82 PathProgramCache]: Analyzing trace with hash -350630558, now seen corresponding path program 10 times [2018-10-22 16:09:02,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:02,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:02,714 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:02,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:02,715 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:02,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:02,936 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:02,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:02,936 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:02,936 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:02,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:02,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:02,937 INFO L197 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 [2018-10-22 16:09:02,945 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:02,945 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:02,997 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:02,997 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:02,999 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:03,012 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:03,012 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:03,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,469 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:03,485 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:03,485 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:03,542 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:03,542 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:03,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:03,558 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:03,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:03,597 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:03,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:03,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:09:03,599 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:03,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:09:03,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:09:03,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:09:03,600 INFO L87 Difference]: Start difference. First operand 90 states and 100 transitions. Second operand 13 states. [2018-10-22 16:09:03,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:03,671 INFO L93 Difference]: Finished difference Result 141 states and 162 transitions. [2018-10-22 16:09:03,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:09:03,672 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 89 [2018-10-22 16:09:03,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:03,672 INFO L225 Difference]: With dead ends: 141 [2018-10-22 16:09:03,672 INFO L226 Difference]: Without dead ends: 95 [2018-10-22 16:09:03,673 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:09:03,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-10-22 16:09:03,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2018-10-22 16:09:03,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-22 16:09:03,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 104 transitions. [2018-10-22 16:09:03,684 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 104 transitions. Word has length 89 [2018-10-22 16:09:03,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:03,685 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 104 transitions. [2018-10-22 16:09:03,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:09:03,685 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 104 transitions. [2018-10-22 16:09:03,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-22 16:09:03,687 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:03,687 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 20, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:03,688 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:03,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:03,688 INFO L82 PathProgramCache]: Analyzing trace with hash 317658512, now seen corresponding path program 11 times [2018-10-22 16:09:03,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:03,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:03,689 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:03,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:03,689 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:03,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:03,859 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:03,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,859 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:03,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:03,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:03,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,860 INFO L197 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 [2018-10-22 16:09:03,872 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:03,873 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:03,906 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-10-22 16:09:03,907 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:03,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:03,922 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:03,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:04,426 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:04,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:04,448 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:04,463 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:04,463 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:04,621 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-10-22 16:09:04,621 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:04,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:04,638 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:04,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:04,663 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:04,664 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:04,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:09:04,664 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:04,665 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:09:04,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:09:04,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:09:04,665 INFO L87 Difference]: Start difference. First operand 94 states and 104 transitions. Second operand 14 states. [2018-10-22 16:09:04,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:04,718 INFO L93 Difference]: Finished difference Result 145 states and 166 transitions. [2018-10-22 16:09:04,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:09:04,718 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 93 [2018-10-22 16:09:04,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:04,719 INFO L225 Difference]: With dead ends: 145 [2018-10-22 16:09:04,719 INFO L226 Difference]: Without dead ends: 99 [2018-10-22 16:09:04,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:09:04,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-22 16:09:04,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-22 16:09:04,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-22 16:09:04,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-10-22 16:09:04,728 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 93 [2018-10-22 16:09:04,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:04,728 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-10-22 16:09:04,728 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:09:04,728 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-10-22 16:09:04,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-22 16:09:04,729 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:04,730 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:04,730 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:04,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:04,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1097373374, now seen corresponding path program 12 times [2018-10-22 16:09:04,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:04,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:04,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:04,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:04,732 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:04,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:04,896 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:04,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:04,897 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:04,897 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:04,897 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:04,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:04,897 INFO L197 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 [2018-10-22 16:09:04,905 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:04,905 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:04,938 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:09:04,938 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:04,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:04,952 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:04,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:05,263 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:05,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:05,283 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:05,298 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:05,298 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:05,469 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:09:05,470 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:05,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:05,494 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:05,494 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:05,523 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:05,524 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:05,525 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:09:05,525 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:05,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:09:05,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:09:05,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:09:05,526 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 15 states. [2018-10-22 16:09:05,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:05,589 INFO L93 Difference]: Finished difference Result 149 states and 170 transitions. [2018-10-22 16:09:05,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:09:05,589 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 97 [2018-10-22 16:09:05,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:05,590 INFO L225 Difference]: With dead ends: 149 [2018-10-22 16:09:05,590 INFO L226 Difference]: Without dead ends: 103 [2018-10-22 16:09:05,591 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:09:05,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-22 16:09:05,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-22 16:09:05,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-22 16:09:05,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 112 transitions. [2018-10-22 16:09:05,600 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 112 transitions. Word has length 97 [2018-10-22 16:09:05,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:05,600 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 112 transitions. [2018-10-22 16:09:05,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:09:05,600 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 112 transitions. [2018-10-22 16:09:05,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-22 16:09:05,602 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:05,602 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:05,602 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:05,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:05,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1480470292, now seen corresponding path program 13 times [2018-10-22 16:09:05,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:05,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:05,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:05,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:05,604 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:05,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:05,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:05,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:05,983 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:05,983 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:05,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:05,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:05,984 INFO L197 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 [2018-10-22 16:09:05,991 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:05,991 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:06,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:06,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:06,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:06,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:06,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:06,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:06,466 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:06,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:06,484 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:06,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:06,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:06,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:06,557 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:06,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:06,599 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:06,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:09:06,599 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:06,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:09:06,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:09:06,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:06,600 INFO L87 Difference]: Start difference. First operand 102 states and 112 transitions. Second operand 16 states. [2018-10-22 16:09:06,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:06,730 INFO L93 Difference]: Finished difference Result 153 states and 174 transitions. [2018-10-22 16:09:06,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:09:06,730 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 101 [2018-10-22 16:09:06,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:06,731 INFO L225 Difference]: With dead ends: 153 [2018-10-22 16:09:06,731 INFO L226 Difference]: Without dead ends: 107 [2018-10-22 16:09:06,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 390 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:09:06,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-22 16:09:06,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2018-10-22 16:09:06,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-22 16:09:06,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-10-22 16:09:06,738 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 101 [2018-10-22 16:09:06,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:06,738 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-10-22 16:09:06,739 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:09:06,739 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-10-22 16:09:06,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-22 16:09:06,740 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:06,740 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:06,740 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:06,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:06,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1836467226, now seen corresponding path program 14 times [2018-10-22 16:09:06,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:06,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:06,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:06,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:06,742 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:06,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:06,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:06,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:06,993 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:06,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:06,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:06,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:06,993 INFO L197 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 [2018-10-22 16:09:07,000 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:07,000 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:07,048 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:07,048 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:07,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:07,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:07,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:07,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:07,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:07,386 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:07,401 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:07,401 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:07,461 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:07,461 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:07,465 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:07,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:07,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:07,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:07,536 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:07,536 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:09:07,536 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:07,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:09:07,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:09:07,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:07,537 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 17 states. [2018-10-22 16:09:07,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:07,610 INFO L93 Difference]: Finished difference Result 157 states and 178 transitions. [2018-10-22 16:09:07,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:09:07,610 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 105 [2018-10-22 16:09:07,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:07,611 INFO L225 Difference]: With dead ends: 157 [2018-10-22 16:09:07,611 INFO L226 Difference]: Without dead ends: 111 [2018-10-22 16:09:07,612 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:09:07,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-22 16:09:07,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-22 16:09:07,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-22 16:09:07,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 120 transitions. [2018-10-22 16:09:07,618 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 120 transitions. Word has length 105 [2018-10-22 16:09:07,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:07,619 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 120 transitions. [2018-10-22 16:09:07,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:09:07,619 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 120 transitions. [2018-10-22 16:09:07,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-22 16:09:07,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:07,620 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 24, 15, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:07,621 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:07,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:07,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1874759608, now seen corresponding path program 15 times [2018-10-22 16:09:07,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:07,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:07,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:07,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:07,624 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:07,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:08,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:08,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:08,304 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:08,304 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:08,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:08,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:08,304 INFO L197 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 [2018-10-22 16:09:08,312 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:08,312 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:08,355 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-10-22 16:09:08,355 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:08,357 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:08,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:08,372 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:09,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:09,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:09,250 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:09,264 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:09,265 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:09,488 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-10-22 16:09:09,488 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:09,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:09,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:09,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:09,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:09,571 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:09,572 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-10-22 16:09:09,572 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:09,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:09:09,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:09:09,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:09,573 INFO L87 Difference]: Start difference. First operand 110 states and 120 transitions. Second operand 18 states. [2018-10-22 16:09:09,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:09,668 INFO L93 Difference]: Finished difference Result 161 states and 182 transitions. [2018-10-22 16:09:09,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:09:09,669 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2018-10-22 16:09:09,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:09,670 INFO L225 Difference]: With dead ends: 161 [2018-10-22 16:09:09,670 INFO L226 Difference]: Without dead ends: 115 [2018-10-22 16:09:09,671 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:09:09,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-22 16:09:09,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-22 16:09:09,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-22 16:09:09,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 124 transitions. [2018-10-22 16:09:09,677 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 124 transitions. Word has length 109 [2018-10-22 16:09:09,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:09,678 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 124 transitions. [2018-10-22 16:09:09,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:09:09,678 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 124 transitions. [2018-10-22 16:09:09,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-22 16:09:09,679 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:09,679 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:09,680 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:09,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:09,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1004612234, now seen corresponding path program 16 times [2018-10-22 16:09:09,680 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:09,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:09,681 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:09,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:09,681 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:09,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:10,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:10,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:10,517 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:10,518 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:10,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:10,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:10,518 INFO L197 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 [2018-10-22 16:09:10,529 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:10,529 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:10,556 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:10,557 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:10,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:10,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:10,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:11,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,444 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:11,463 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:11,463 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:11,535 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:11,535 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:11,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:11,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:11,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:11,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:11,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:11,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:09:11,578 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:11,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:09:11,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:09:11,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:11,579 INFO L87 Difference]: Start difference. First operand 114 states and 124 transitions. Second operand 19 states. [2018-10-22 16:09:11,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:11,668 INFO L93 Difference]: Finished difference Result 165 states and 186 transitions. [2018-10-22 16:09:11,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:09:11,668 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 113 [2018-10-22 16:09:11,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:11,669 INFO L225 Difference]: With dead ends: 165 [2018-10-22 16:09:11,669 INFO L226 Difference]: Without dead ends: 119 [2018-10-22 16:09:11,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:09:11,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-22 16:09:11,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2018-10-22 16:09:11,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-22 16:09:11,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2018-10-22 16:09:11,676 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 113 [2018-10-22 16:09:11,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:11,677 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2018-10-22 16:09:11,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:09:11,677 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2018-10-22 16:09:11,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-22 16:09:11,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:11,678 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 26, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:11,679 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:11,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:11,679 INFO L82 PathProgramCache]: Analyzing trace with hash 1397355428, now seen corresponding path program 17 times [2018-10-22 16:09:11,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:11,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:11,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:11,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:11,681 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:11,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:11,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:11,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,971 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:11,971 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:11,971 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:11,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,972 INFO L197 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 [2018-10-22 16:09:11,979 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:11,979 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:12,030 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2018-10-22 16:09:12,030 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:12,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:12,054 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:12,054 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:13,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:13,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:13,522 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:13,537 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:13,537 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:13,777 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2018-10-22 16:09:13,777 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:13,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:13,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:13,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:13,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:13,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:13,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:09:13,862 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:13,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:09:13,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:09:13,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:09:13,863 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand 20 states. [2018-10-22 16:09:13,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:13,938 INFO L93 Difference]: Finished difference Result 169 states and 190 transitions. [2018-10-22 16:09:13,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:09:13,938 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 117 [2018-10-22 16:09:13,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:13,939 INFO L225 Difference]: With dead ends: 169 [2018-10-22 16:09:13,939 INFO L226 Difference]: Without dead ends: 123 [2018-10-22 16:09:13,940 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:09:13,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-22 16:09:13,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-22 16:09:13,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-22 16:09:13,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 132 transitions. [2018-10-22 16:09:13,946 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 132 transitions. Word has length 117 [2018-10-22 16:09:13,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:13,947 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 132 transitions. [2018-10-22 16:09:13,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:09:13,947 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 132 transitions. [2018-10-22 16:09:13,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-22 16:09:13,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:13,948 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 27, 18, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:13,948 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:13,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:13,948 INFO L82 PathProgramCache]: Analyzing trace with hash -29472046, now seen corresponding path program 18 times [2018-10-22 16:09:13,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:13,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:13,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:13,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:13,950 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:13,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:14,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 693 proven. 666 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:14,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:14,207 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:14,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:14,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:14,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:14,208 INFO L197 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 [2018-10-22 16:09:14,215 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:14,215 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:14,258 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-10-22 16:09:14,259 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:14,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:14,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1132 proven. 343 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2018-10-22 16:09:14,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:15,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1132 proven. 343 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2018-10-22 16:09:15,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:15,052 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:15,071 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:15,072 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:15,347 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-10-22 16:09:15,347 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:15,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:15,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 693 proven. 666 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:15,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:16,277 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 693 proven. 666 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:09:16,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:16,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 67 [2018-10-22 16:09:16,279 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:16,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:09:16,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:09:16,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=3237, Unknown=0, NotChecked=0, Total=4422 [2018-10-22 16:09:16,281 INFO L87 Difference]: Start difference. First operand 122 states and 132 transitions. Second operand 40 states. [2018-10-22 16:09:17,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:17,128 INFO L93 Difference]: Finished difference Result 542 states and 662 transitions. [2018-10-22 16:09:17,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-22 16:09:17,133 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-22 16:09:17,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:17,136 INFO L225 Difference]: With dead ends: 542 [2018-10-22 16:09:17,136 INFO L226 Difference]: Without dead ends: 496 [2018-10-22 16:09:17,139 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 418 SyntacticMatches, 20 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2825 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3052, Invalid=7660, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:09:17,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2018-10-22 16:09:17,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 162. [2018-10-22 16:09:17,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-22 16:09:17,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2018-10-22 16:09:17,158 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 121 [2018-10-22 16:09:17,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:17,158 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2018-10-22 16:09:17,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:09:17,158 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2018-10-22 16:09:17,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-22 16:09:17,159 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:17,159 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:17,160 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:17,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:17,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1933849908, now seen corresponding path program 19 times [2018-10-22 16:09:17,160 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:17,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:17,161 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:17,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:17,161 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:17,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:17,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:17,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:17,474 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:17,474 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:17,475 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:17,475 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:17,475 INFO L197 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 [2018-10-22 16:09:17,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:17,483 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:17,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:17,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:17,558 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:17,558 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:18,834 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:18,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:18,854 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:18,869 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:18,869 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:18,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:18,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:18,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:18,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:19,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:19,014 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:19,014 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-10-22 16:09:19,014 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:19,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:09:19,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:09:19,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:09:19,016 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand 22 states. [2018-10-22 16:09:19,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:19,097 INFO L93 Difference]: Finished difference Result 249 states and 288 transitions. [2018-10-22 16:09:19,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:09:19,098 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 161 [2018-10-22 16:09:19,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:19,099 INFO L225 Difference]: With dead ends: 249 [2018-10-22 16:09:19,099 INFO L226 Difference]: Without dead ends: 167 [2018-10-22 16:09:19,100 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 664 GetRequests, 624 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:09:19,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-22 16:09:19,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2018-10-22 16:09:19,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-22 16:09:19,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 185 transitions. [2018-10-22 16:09:19,114 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 185 transitions. Word has length 161 [2018-10-22 16:09:19,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:19,114 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 185 transitions. [2018-10-22 16:09:19,114 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:09:19,114 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 185 transitions. [2018-10-22 16:09:19,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-22 16:09:19,115 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:19,116 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 38, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:19,116 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:19,116 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:19,116 INFO L82 PathProgramCache]: Analyzing trace with hash 78419194, now seen corresponding path program 20 times [2018-10-22 16:09:19,116 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:19,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:19,117 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:19,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:19,117 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:19,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:19,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:19,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:19,512 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:19,513 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:19,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:19,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:19,513 INFO L197 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 [2018-10-22 16:09:19,520 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:19,520 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:19,566 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:19,566 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:19,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:19,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:19,594 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:20,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:20,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:20,260 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:20,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:20,275 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:20,365 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:20,365 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:20,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:20,397 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:20,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:20,459 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:20,461 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:20,461 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-10-22 16:09:20,462 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:20,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:09:20,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:09:20,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:09:20,463 INFO L87 Difference]: Start difference. First operand 166 states and 185 transitions. Second operand 23 states. [2018-10-22 16:09:21,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:21,125 INFO L93 Difference]: Finished difference Result 253 states and 292 transitions. [2018-10-22 16:09:21,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:09:21,125 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 165 [2018-10-22 16:09:21,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:21,126 INFO L225 Difference]: With dead ends: 253 [2018-10-22 16:09:21,127 INFO L226 Difference]: Without dead ends: 171 [2018-10-22 16:09:21,128 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 639 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-22 16:09:21,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-10-22 16:09:21,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2018-10-22 16:09:21,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-10-22 16:09:21,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 189 transitions. [2018-10-22 16:09:21,144 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 189 transitions. Word has length 165 [2018-10-22 16:09:21,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:21,144 INFO L481 AbstractCegarLoop]: Abstraction has 170 states and 189 transitions. [2018-10-22 16:09:21,145 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:09:21,145 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 189 transitions. [2018-10-22 16:09:21,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-10-22 16:09:21,146 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:21,146 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 39, 21, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:21,146 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:21,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:21,146 INFO L82 PathProgramCache]: Analyzing trace with hash 632330280, now seen corresponding path program 21 times [2018-10-22 16:09:21,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:21,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:21,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:21,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:21,147 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:21,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:21,486 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1587 proven. 903 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:21,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:21,487 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:21,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:21,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:21,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:21,487 INFO L197 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 [2018-10-22 16:09:21,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:21,495 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:21,558 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-22 16:09:21,558 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:21,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:22,310 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1714 proven. 1333 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2018-10-22 16:09:22,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:23,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1714 proven. 1333 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2018-10-22 16:09:23,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:23,183 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:23,200 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:23,200 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:23,691 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-22 16:09:23,691 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:23,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:23,716 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1587 proven. 903 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:23,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:24,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1587 proven. 903 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:09:24,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:24,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 70 [2018-10-22 16:09:24,564 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:24,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 16:09:24,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 16:09:24,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1359, Invalid=3471, Unknown=0, NotChecked=0, Total=4830 [2018-10-22 16:09:24,567 INFO L87 Difference]: Start difference. First operand 170 states and 189 transitions. Second operand 46 states. [2018-10-22 16:09:25,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:25,571 INFO L93 Difference]: Finished difference Result 488 states and 587 transitions. [2018-10-22 16:09:25,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-22 16:09:25,573 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 169 [2018-10-22 16:09:25,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:25,576 INFO L225 Difference]: With dead ends: 488 [2018-10-22 16:09:25,576 INFO L226 Difference]: Without dead ends: 406 [2018-10-22 16:09:25,580 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 741 GetRequests, 592 SyntacticMatches, 38 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3611 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3529, Invalid=9127, Unknown=0, NotChecked=0, Total=12656 [2018-10-22 16:09:25,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2018-10-22 16:09:25,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 186. [2018-10-22 16:09:25,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-22 16:09:25,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 208 transitions. [2018-10-22 16:09:25,608 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 208 transitions. Word has length 169 [2018-10-22 16:09:25,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:25,609 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 208 transitions. [2018-10-22 16:09:25,609 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-22 16:09:25,609 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 208 transitions. [2018-10-22 16:09:25,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-22 16:09:25,610 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:25,610 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:25,610 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:25,611 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:25,611 INFO L82 PathProgramCache]: Analyzing trace with hash 762179226, now seen corresponding path program 22 times [2018-10-22 16:09:25,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:25,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:25,612 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:25,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:25,612 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:25,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:26,505 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:26,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:26,506 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:26,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:26,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:26,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:26,506 INFO L197 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 [2018-10-22 16:09:26,515 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:26,515 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:26,584 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:26,584 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:26,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:26,618 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:26,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:27,293 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:27,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:27,315 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:27,330 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:27,331 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:27,441 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:27,441 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:27,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:27,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:27,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:27,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:27,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-10-22 16:09:27,498 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:27,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:09:27,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:09:27,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:09:27,500 INFO L87 Difference]: Start difference. First operand 186 states and 208 transitions. Second operand 25 states. [2018-10-22 16:09:27,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:27,628 INFO L93 Difference]: Finished difference Result 285 states and 330 transitions. [2018-10-22 16:09:27,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:09:27,628 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 185 [2018-10-22 16:09:27,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:27,629 INFO L225 Difference]: With dead ends: 285 [2018-10-22 16:09:27,630 INFO L226 Difference]: Without dead ends: 191 [2018-10-22 16:09:27,631 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 717 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:09:27,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2018-10-22 16:09:27,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2018-10-22 16:09:27,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-22 16:09:27,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 212 transitions. [2018-10-22 16:09:27,651 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 212 transitions. Word has length 185 [2018-10-22 16:09:27,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:27,651 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 212 transitions. [2018-10-22 16:09:27,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:09:27,651 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 212 transitions. [2018-10-22 16:09:27,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-22 16:09:27,652 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:27,652 INFO L375 BasicCegarLoop]: trace histogram [45, 45, 44, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:27,652 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:27,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:27,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1295085880, now seen corresponding path program 23 times [2018-10-22 16:09:27,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:27,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:27,653 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:27,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:27,653 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:27,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:28,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:28,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:28,059 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:28,060 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:28,060 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:28,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:28,060 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:28,081 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:28,082 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:28,153 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 45 check-sat command(s) [2018-10-22 16:09:28,153 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:28,158 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:28,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:28,190 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:29,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:29,308 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:29,323 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:29,323 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:29,884 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 45 check-sat command(s) [2018-10-22 16:09:29,885 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:29,890 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:29,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:29,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:29,941 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:29,942 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:29,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 50 [2018-10-22 16:09:29,943 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:29,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:09:29,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:09:29,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:09:29,944 INFO L87 Difference]: Start difference. First operand 190 states and 212 transitions. Second operand 26 states. [2018-10-22 16:09:30,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:30,058 INFO L93 Difference]: Finished difference Result 289 states and 334 transitions. [2018-10-22 16:09:30,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:09:30,059 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 189 [2018-10-22 16:09:30,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:30,061 INFO L225 Difference]: With dead ends: 289 [2018-10-22 16:09:30,061 INFO L226 Difference]: Without dead ends: 195 [2018-10-22 16:09:30,062 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 780 GetRequests, 732 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:09:30,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-22 16:09:30,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 194. [2018-10-22 16:09:30,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-10-22 16:09:30,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 216 transitions. [2018-10-22 16:09:30,087 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 216 transitions. Word has length 189 [2018-10-22 16:09:30,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:30,088 INFO L481 AbstractCegarLoop]: Abstraction has 194 states and 216 transitions. [2018-10-22 16:09:30,088 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:09:30,088 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 216 transitions. [2018-10-22 16:09:30,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-10-22 16:09:30,089 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:30,089 INFO L375 BasicCegarLoop]: trace histogram [46, 46, 45, 24, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:30,089 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:30,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:30,090 INFO L82 PathProgramCache]: Analyzing trace with hash 1499949046, now seen corresponding path program 24 times [2018-10-22 16:09:30,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:30,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:30,091 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:30,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:30,091 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:30,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:30,438 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:30,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:30,439 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:30,439 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:30,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:30,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:30,439 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:30,446 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:30,446 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:30,530 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 44 check-sat command(s) [2018-10-22 16:09:30,531 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:30,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:30,556 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:30,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:31,460 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:31,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:31,482 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:31,497 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:31,498 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:32,126 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 44 check-sat command(s) [2018-10-22 16:09:32,126 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:32,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:32,165 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:32,165 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:32,239 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:32,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:32,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 52 [2018-10-22 16:09:32,241 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:32,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:09:32,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:09:32,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:32,242 INFO L87 Difference]: Start difference. First operand 194 states and 216 transitions. Second operand 27 states. [2018-10-22 16:09:32,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:32,361 INFO L93 Difference]: Finished difference Result 293 states and 338 transitions. [2018-10-22 16:09:32,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:09:32,368 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 193 [2018-10-22 16:09:32,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:32,369 INFO L225 Difference]: With dead ends: 293 [2018-10-22 16:09:32,370 INFO L226 Difference]: Without dead ends: 199 [2018-10-22 16:09:32,370 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 747 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:32,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-22 16:09:32,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-22 16:09:32,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-22 16:09:32,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 220 transitions. [2018-10-22 16:09:32,395 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 220 transitions. Word has length 193 [2018-10-22 16:09:32,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:32,396 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 220 transitions. [2018-10-22 16:09:32,396 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:09:32,396 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 220 transitions. [2018-10-22 16:09:32,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-22 16:09:32,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:32,397 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 25, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:32,397 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:32,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:32,398 INFO L82 PathProgramCache]: Analyzing trace with hash -395052508, now seen corresponding path program 25 times [2018-10-22 16:09:32,398 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:32,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:32,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:32,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:32,399 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:32,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:32,946 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:32,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:32,947 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:32,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:32,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:32,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:32,947 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:32,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:32,955 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:33,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:33,018 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:33,102 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:33,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:34,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:34,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:34,704 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:34,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:34,733 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:34,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:34,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:34,882 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:34,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:34,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:34,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:34,981 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 52 [2018-10-22 16:09:34,982 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:34,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:09:34,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:09:34,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:34,983 INFO L87 Difference]: Start difference. First operand 198 states and 220 transitions. Second operand 28 states. [2018-10-22 16:09:35,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:35,102 INFO L93 Difference]: Finished difference Result 297 states and 342 transitions. [2018-10-22 16:09:35,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:09:35,102 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 197 [2018-10-22 16:09:35,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:35,104 INFO L225 Difference]: With dead ends: 297 [2018-10-22 16:09:35,104 INFO L226 Difference]: Without dead ends: 203 [2018-10-22 16:09:35,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 814 GetRequests, 760 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:35,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-10-22 16:09:35,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2018-10-22 16:09:35,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-22 16:09:35,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 224 transitions. [2018-10-22 16:09:35,132 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 224 transitions. Word has length 197 [2018-10-22 16:09:35,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:35,133 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 224 transitions. [2018-10-22 16:09:35,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:09:35,133 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 224 transitions. [2018-10-22 16:09:35,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-22 16:09:35,134 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:35,135 INFO L375 BasicCegarLoop]: trace histogram [48, 48, 47, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:35,135 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:35,135 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:35,136 INFO L82 PathProgramCache]: Analyzing trace with hash 493864274, now seen corresponding path program 26 times [2018-10-22 16:09:35,136 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:35,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:35,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:35,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:35,137 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:35,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:36,381 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:36,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:36,381 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:36,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:36,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:36,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:36,382 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:36,392 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:36,392 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:36,445 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:36,445 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:36,448 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:36,484 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:36,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:37,425 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:37,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:37,446 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:37,461 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:37,461 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:37,572 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:37,572 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:37,578 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:37,608 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:37,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:37,741 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:37,742 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:37,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 52 [2018-10-22 16:09:37,743 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:37,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:09:37,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:09:37,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:37,744 INFO L87 Difference]: Start difference. First operand 202 states and 224 transitions. Second operand 29 states. [2018-10-22 16:09:37,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:37,962 INFO L93 Difference]: Finished difference Result 301 states and 346 transitions. [2018-10-22 16:09:37,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:09:37,963 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 201 [2018-10-22 16:09:37,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:37,964 INFO L225 Difference]: With dead ends: 301 [2018-10-22 16:09:37,964 INFO L226 Difference]: Without dead ends: 207 [2018-10-22 16:09:37,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 773 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:37,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-22 16:09:37,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2018-10-22 16:09:37,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-10-22 16:09:37,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 228 transitions. [2018-10-22 16:09:37,992 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 228 transitions. Word has length 201 [2018-10-22 16:09:37,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:37,992 INFO L481 AbstractCegarLoop]: Abstraction has 206 states and 228 transitions. [2018-10-22 16:09:37,993 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:09:37,993 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 228 transitions. [2018-10-22 16:09:37,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-22 16:09:37,994 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:37,994 INFO L375 BasicCegarLoop]: trace histogram [49, 49, 48, 27, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:37,994 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:37,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:37,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1944696448, now seen corresponding path program 27 times [2018-10-22 16:09:37,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:37,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:37,996 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:37,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:37,996 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:38,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:39,025 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:39,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:39,026 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:39,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:39,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:39,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:39,026 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:39,033 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:39,033 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:39,209 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-10-22 16:09:39,209 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:39,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:39,267 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:39,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:40,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:40,961 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:40,976 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:40,976 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:41,677 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-10-22 16:09:41,677 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:41,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:41,708 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:41,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:41,859 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:41,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:41,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 52 [2018-10-22 16:09:41,861 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:41,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:09:41,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:09:41,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:41,862 INFO L87 Difference]: Start difference. First operand 206 states and 228 transitions. Second operand 30 states. [2018-10-22 16:09:41,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:41,984 INFO L93 Difference]: Finished difference Result 305 states and 350 transitions. [2018-10-22 16:09:41,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:09:41,991 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 205 [2018-10-22 16:09:41,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:41,993 INFO L225 Difference]: With dead ends: 305 [2018-10-22 16:09:41,993 INFO L226 Difference]: Without dead ends: 211 [2018-10-22 16:09:41,994 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 786 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:41,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-22 16:09:42,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-22 16:09:42,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-22 16:09:42,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 232 transitions. [2018-10-22 16:09:42,020 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 232 transitions. Word has length 205 [2018-10-22 16:09:42,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:42,020 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 232 transitions. [2018-10-22 16:09:42,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:09:42,020 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 232 transitions. [2018-10-22 16:09:42,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-22 16:09:42,022 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:42,022 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 28, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:42,022 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:42,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:42,022 INFO L82 PathProgramCache]: Analyzing trace with hash 2120418990, now seen corresponding path program 28 times [2018-10-22 16:09:42,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:42,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:42,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:42,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:42,023 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:42,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:42,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:42,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,812 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:42,812 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:42,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:42,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:42,812 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:42,819 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:42,819 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:42,890 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:42,890 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:42,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:42,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:42,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:44,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,304 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:44,320 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:44,320 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:44,448 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:44,448 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:44,454 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:44,481 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:44,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:44,691 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:44,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:44,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 52 [2018-10-22 16:09:44,693 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:44,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:09:44,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:09:44,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:44,694 INFO L87 Difference]: Start difference. First operand 210 states and 232 transitions. Second operand 31 states. [2018-10-22 16:09:44,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:44,817 INFO L93 Difference]: Finished difference Result 309 states and 354 transitions. [2018-10-22 16:09:44,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:09:44,821 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 209 [2018-10-22 16:09:44,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:44,823 INFO L225 Difference]: With dead ends: 309 [2018-10-22 16:09:44,823 INFO L226 Difference]: Without dead ends: 215 [2018-10-22 16:09:44,824 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 799 SyntacticMatches, 16 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:44,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-10-22 16:09:44,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2018-10-22 16:09:44,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-22 16:09:44,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 236 transitions. [2018-10-22 16:09:44,850 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 236 transitions. Word has length 209 [2018-10-22 16:09:44,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:44,850 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 236 transitions. [2018-10-22 16:09:44,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:09:44,851 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 236 transitions. [2018-10-22 16:09:44,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-22 16:09:44,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:44,852 INFO L375 BasicCegarLoop]: trace histogram [51, 51, 50, 29, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:44,853 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:44,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:44,853 INFO L82 PathProgramCache]: Analyzing trace with hash -728662820, now seen corresponding path program 29 times [2018-10-22 16:09:44,853 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:44,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:44,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:44,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:44,855 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:44,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:45,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:45,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,685 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:45,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:45,685 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:45,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:45,686 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:45,695 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:45,695 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:45,816 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 51 check-sat command(s) [2018-10-22 16:09:45,816 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:45,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:45,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:45,859 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:46,667 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,668 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:46,682 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:46,683 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:47,380 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 51 check-sat command(s) [2018-10-22 16:09:47,380 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:47,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:47,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:47,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:47,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:47,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 52 [2018-10-22 16:09:47,694 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:47,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 16:09:47,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 16:09:47,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:47,695 INFO L87 Difference]: Start difference. First operand 214 states and 236 transitions. Second operand 32 states. [2018-10-22 16:09:47,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:47,816 INFO L93 Difference]: Finished difference Result 313 states and 358 transitions. [2018-10-22 16:09:47,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:09:47,817 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 213 [2018-10-22 16:09:47,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:47,818 INFO L225 Difference]: With dead ends: 313 [2018-10-22 16:09:47,818 INFO L226 Difference]: Without dead ends: 219 [2018-10-22 16:09:47,819 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 812 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:47,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-22 16:09:47,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2018-10-22 16:09:47,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2018-10-22 16:09:47,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 240 transitions. [2018-10-22 16:09:47,845 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 240 transitions. Word has length 213 [2018-10-22 16:09:47,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:47,845 INFO L481 AbstractCegarLoop]: Abstraction has 218 states and 240 transitions. [2018-10-22 16:09:47,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 16:09:47,846 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 240 transitions. [2018-10-22 16:09:47,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-10-22 16:09:47,847 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:47,847 INFO L375 BasicCegarLoop]: trace histogram [52, 52, 51, 30, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:47,847 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:47,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:47,848 INFO L82 PathProgramCache]: Analyzing trace with hash -451073014, now seen corresponding path program 30 times [2018-10-22 16:09:47,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:47,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:47,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:47,849 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:47,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:48,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:48,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,362 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:48,362 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:48,362 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:48,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:48,362 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:48,372 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:48,372 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:48,448 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-10-22 16:09:48,448 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:48,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:48,482 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:48,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:49,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:49,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:49,656 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:49,671 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:49,671 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:50,366 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-10-22 16:09:50,367 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:50,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:50,402 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:50,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:50,688 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:50,690 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:50,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 52 [2018-10-22 16:09:50,690 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:50,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:09:50,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:09:50,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:50,692 INFO L87 Difference]: Start difference. First operand 218 states and 240 transitions. Second operand 33 states. [2018-10-22 16:09:50,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:50,834 INFO L93 Difference]: Finished difference Result 317 states and 362 transitions. [2018-10-22 16:09:50,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:09:50,834 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 217 [2018-10-22 16:09:50,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:50,836 INFO L225 Difference]: With dead ends: 317 [2018-10-22 16:09:50,836 INFO L226 Difference]: Without dead ends: 223 [2018-10-22 16:09:50,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 899 GetRequests, 825 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:50,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-22 16:09:50,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-22 16:09:50,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-22 16:09:50,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 244 transitions. [2018-10-22 16:09:50,863 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 244 transitions. Word has length 217 [2018-10-22 16:09:50,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:50,864 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 244 transitions. [2018-10-22 16:09:50,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:09:50,864 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 244 transitions. [2018-10-22 16:09:50,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-22 16:09:50,865 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:50,865 INFO L375 BasicCegarLoop]: trace histogram [53, 53, 52, 31, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:50,866 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:50,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:50,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1556190264, now seen corresponding path program 31 times [2018-10-22 16:09:50,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:50,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,867 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:50,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:50,867 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:50,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:51,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,697 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:51,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:51,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:51,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,698 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:51,705 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:51,705 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:51,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:51,797 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:51,797 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:52,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:52,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:52,641 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:52,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:52,656 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:52,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:52,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:52,813 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:52,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:53,128 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:53,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:53,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 52 [2018-10-22 16:09:53,130 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:53,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:09:53,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:09:53,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:53,132 INFO L87 Difference]: Start difference. First operand 222 states and 244 transitions. Second operand 34 states. [2018-10-22 16:09:53,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:53,315 INFO L93 Difference]: Finished difference Result 321 states and 366 transitions. [2018-10-22 16:09:53,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:09:53,315 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 221 [2018-10-22 16:09:53,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:53,316 INFO L225 Difference]: With dead ends: 321 [2018-10-22 16:09:53,316 INFO L226 Difference]: Without dead ends: 227 [2018-10-22 16:09:53,317 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 916 GetRequests, 838 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:53,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-22 16:09:53,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2018-10-22 16:09:53,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-22 16:09:53,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 248 transitions. [2018-10-22 16:09:53,343 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 248 transitions. Word has length 221 [2018-10-22 16:09:53,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:53,343 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 248 transitions. [2018-10-22 16:09:53,343 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:09:53,343 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 248 transitions. [2018-10-22 16:09:53,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-22 16:09:53,345 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:53,345 INFO L375 BasicCegarLoop]: trace histogram [54, 54, 53, 32, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:53,345 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:53,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:53,345 INFO L82 PathProgramCache]: Analyzing trace with hash 511325542, now seen corresponding path program 32 times [2018-10-22 16:09:53,345 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:53,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:53,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:53,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:53,346 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:53,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:54,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:54,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,264 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:54,265 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:54,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:54,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:54,265 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:54,272 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:54,272 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:54,333 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:54,333 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:54,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,379 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:54,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:55,425 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:55,445 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:55,445 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:55,460 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:55,461 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:55,590 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:55,591 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:55,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:55,634 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:55,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:55,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:55,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:55,961 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 52 [2018-10-22 16:09:55,961 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:55,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-22 16:09:55,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-22 16:09:55,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:55,962 INFO L87 Difference]: Start difference. First operand 226 states and 248 transitions. Second operand 35 states. [2018-10-22 16:09:56,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:56,099 INFO L93 Difference]: Finished difference Result 325 states and 370 transitions. [2018-10-22 16:09:56,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-22 16:09:56,100 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 225 [2018-10-22 16:09:56,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:56,101 INFO L225 Difference]: With dead ends: 325 [2018-10-22 16:09:56,101 INFO L226 Difference]: Without dead ends: 231 [2018-10-22 16:09:56,102 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 851 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:09:56,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2018-10-22 16:09:56,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 230. [2018-10-22 16:09:56,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2018-10-22 16:09:56,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 252 transitions. [2018-10-22 16:09:56,129 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 252 transitions. Word has length 225 [2018-10-22 16:09:56,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:56,129 INFO L481 AbstractCegarLoop]: Abstraction has 230 states and 252 transitions. [2018-10-22 16:09:56,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-22 16:09:56,129 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 252 transitions. [2018-10-22 16:09:56,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2018-10-22 16:09:56,131 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:56,131 INFO L375 BasicCegarLoop]: trace histogram [55, 55, 54, 33, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:56,131 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:56,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:56,131 INFO L82 PathProgramCache]: Analyzing trace with hash 595758996, now seen corresponding path program 33 times [2018-10-22 16:09:56,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:56,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:56,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:56,133 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:56,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:58,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2868 proven. 2211 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:09:58,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,375 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:58,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:58,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:58,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,376 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:58,382 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:58,383 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:58,477 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-10-22 16:09:58,477 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:58,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 4048 proven. 1807 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2018-10-22 16:09:59,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:00,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 4048 proven. 1807 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2018-10-22 16:10:00,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:00,838 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:00,853 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:00,853 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:01,692 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-10-22 16:10:01,692 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:01,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:01,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2868 proven. 2211 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:10:01,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:03,017 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2868 proven. 2211 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-22 16:10:03,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:03,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 97 [2018-10-22 16:10:03,019 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:03,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-22 16:10:03,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-22 16:10:03,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2406, Invalid=6906, Unknown=0, NotChecked=0, Total=9312 [2018-10-22 16:10:03,020 INFO L87 Difference]: Start difference. First operand 230 states and 252 transitions. Second operand 70 states. [2018-10-22 16:10:05,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:05,294 INFO L93 Difference]: Finished difference Result 1397 states and 1718 transitions. [2018-10-22 16:10:05,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-10-22 16:10:05,295 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 229 [2018-10-22 16:10:05,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:05,299 INFO L225 Difference]: With dead ends: 1397 [2018-10-22 16:10:05,299 INFO L226 Difference]: Without dead ends: 1303 [2018-10-22 16:10:05,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1017 GetRequests, 793 SyntacticMatches, 62 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8978 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=6793, Invalid=19939, Unknown=0, NotChecked=0, Total=26732 [2018-10-22 16:10:05,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1303 states. [2018-10-22 16:10:05,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1303 to 282. [2018-10-22 16:10:05,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-10-22 16:10:05,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-10-22 16:10:05,375 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 229 [2018-10-22 16:10:05,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:05,376 INFO L481 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-10-22 16:10:05,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-22 16:10:05,376 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-10-22 16:10:05,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2018-10-22 16:10:05,377 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:05,377 INFO L375 BasicCegarLoop]: trace histogram [68, 68, 67, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:05,377 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:05,377 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:05,377 INFO L82 PathProgramCache]: Analyzing trace with hash -760881198, now seen corresponding path program 34 times [2018-10-22 16:10:05,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:05,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:05,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:05,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:05,378 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:05,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:06,323 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:06,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,323 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:06,324 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:06,324 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:06,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:06,324 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:06,332 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:06,332 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:06,400 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:06,400 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:06,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:06,448 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:06,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:07,362 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:07,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,382 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:07,398 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:07,398 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:07,567 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:07,568 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:07,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:07,628 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:07,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,055 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:08,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:08,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 52 [2018-10-22 16:10:08,057 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:08,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-22 16:10:08,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-22 16:10:08,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:08,058 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 37 states. [2018-10-22 16:10:08,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:08,228 INFO L93 Difference]: Finished difference Result 429 states and 498 transitions. [2018-10-22 16:10:08,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:10:08,229 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 281 [2018-10-22 16:10:08,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:08,230 INFO L225 Difference]: With dead ends: 429 [2018-10-22 16:10:08,230 INFO L226 Difference]: Without dead ends: 287 [2018-10-22 16:10:08,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 1069 SyntacticMatches, 40 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:08,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-10-22 16:10:08,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2018-10-22 16:10:08,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2018-10-22 16:10:08,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 320 transitions. [2018-10-22 16:10:08,297 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 320 transitions. Word has length 281 [2018-10-22 16:10:08,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:08,298 INFO L481 AbstractCegarLoop]: Abstraction has 286 states and 320 transitions. [2018-10-22 16:10:08,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-22 16:10:08,298 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 320 transitions. [2018-10-22 16:10:08,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-10-22 16:10:08,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:08,300 INFO L375 BasicCegarLoop]: trace histogram [69, 69, 68, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:08,300 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:08,300 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:08,301 INFO L82 PathProgramCache]: Analyzing trace with hash -344860672, now seen corresponding path program 35 times [2018-10-22 16:10:08,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:08,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:08,302 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:08,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:08,302 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:08,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:09,341 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:09,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:09,341 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:09,341 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:09,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:09,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:09,342 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:09,349 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:09,349 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:09,486 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-10-22 16:10:09,486 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:09,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:09,535 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:09,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:10,562 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:10,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:10,582 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:10,597 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:10,597 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:11,775 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-10-22 16:10:11,776 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:11,783 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:11,829 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:11,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:12,305 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:12,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:12,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 52 [2018-10-22 16:10:12,307 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:12,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 16:10:12,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 16:10:12,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:12,308 INFO L87 Difference]: Start difference. First operand 286 states and 320 transitions. Second operand 38 states. [2018-10-22 16:10:12,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:12,478 INFO L93 Difference]: Finished difference Result 433 states and 502 transitions. [2018-10-22 16:10:12,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-22 16:10:12,478 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 285 [2018-10-22 16:10:12,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:12,480 INFO L225 Difference]: With dead ends: 433 [2018-10-22 16:10:12,480 INFO L226 Difference]: Without dead ends: 291 [2018-10-22 16:10:12,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 1082 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:12,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2018-10-22 16:10:12,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 290. [2018-10-22 16:10:12,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-10-22 16:10:12,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 324 transitions. [2018-10-22 16:10:12,561 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 324 transitions. Word has length 285 [2018-10-22 16:10:12,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:12,561 INFO L481 AbstractCegarLoop]: Abstraction has 290 states and 324 transitions. [2018-10-22 16:10:12,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 16:10:12,562 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 324 transitions. [2018-10-22 16:10:12,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2018-10-22 16:10:12,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:12,563 INFO L375 BasicCegarLoop]: trace histogram [70, 70, 69, 36, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:12,564 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:12,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:12,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1342834990, now seen corresponding path program 36 times [2018-10-22 16:10:12,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:12,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:12,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:12,565 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:12,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:15,081 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:15,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:15,082 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:15,082 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:15,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:15,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:15,082 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:15,090 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:15,090 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:15,211 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-10-22 16:10:15,211 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:15,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:15,267 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:15,267 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:16,124 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:16,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:16,145 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:16,164 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:16,164 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:17,398 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-10-22 16:10:17,398 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:17,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:17,453 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:17,453 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:17,946 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:17,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:17,948 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 52 [2018-10-22 16:10:17,948 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:17,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:10:17,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:10:17,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:17,950 INFO L87 Difference]: Start difference. First operand 290 states and 324 transitions. Second operand 39 states. [2018-10-22 16:10:18,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:18,151 INFO L93 Difference]: Finished difference Result 437 states and 506 transitions. [2018-10-22 16:10:18,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:10:18,151 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 289 [2018-10-22 16:10:18,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:18,153 INFO L225 Difference]: With dead ends: 437 [2018-10-22 16:10:18,153 INFO L226 Difference]: Without dead ends: 295 [2018-10-22 16:10:18,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1193 GetRequests, 1095 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:18,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2018-10-22 16:10:18,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2018-10-22 16:10:18,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2018-10-22 16:10:18,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 328 transitions. [2018-10-22 16:10:18,214 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 328 transitions. Word has length 289 [2018-10-22 16:10:18,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:18,214 INFO L481 AbstractCegarLoop]: Abstraction has 294 states and 328 transitions. [2018-10-22 16:10:18,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:10:18,214 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 328 transitions. [2018-10-22 16:10:18,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2018-10-22 16:10:18,216 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:18,216 INFO L375 BasicCegarLoop]: trace histogram [71, 71, 70, 37, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:18,216 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:18,217 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:18,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1571418972, now seen corresponding path program 37 times [2018-10-22 16:10:18,217 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:18,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,218 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:18,218 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:18,218 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:18,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:19,065 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:19,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:19,066 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:19,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:19,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:19,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:19,066 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:19,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:19,074 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:19,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:19,153 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:19,202 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:19,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:20,459 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:20,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,480 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:20,495 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:20,495 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:20,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:20,706 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:20,707 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:21,222 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:21,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:21,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 52 [2018-10-22 16:10:21,223 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:21,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-22 16:10:21,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-22 16:10:21,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:21,225 INFO L87 Difference]: Start difference. First operand 294 states and 328 transitions. Second operand 40 states. [2018-10-22 16:10:21,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:21,404 INFO L93 Difference]: Finished difference Result 441 states and 510 transitions. [2018-10-22 16:10:21,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:10:21,405 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 293 [2018-10-22 16:10:21,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:21,406 INFO L225 Difference]: With dead ends: 441 [2018-10-22 16:10:21,406 INFO L226 Difference]: Without dead ends: 299 [2018-10-22 16:10:21,406 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1210 GetRequests, 1108 SyntacticMatches, 52 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:21,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-10-22 16:10:21,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 298. [2018-10-22 16:10:21,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-22 16:10:21,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 332 transitions. [2018-10-22 16:10:21,474 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 332 transitions. Word has length 293 [2018-10-22 16:10:21,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:21,474 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 332 transitions. [2018-10-22 16:10:21,474 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-22 16:10:21,474 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 332 transitions. [2018-10-22 16:10:21,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-22 16:10:21,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:21,477 INFO L375 BasicCegarLoop]: trace histogram [72, 72, 71, 38, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:21,477 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:21,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:21,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1741493898, now seen corresponding path program 38 times [2018-10-22 16:10:21,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:21,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:21,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:21,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:21,478 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:21,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:22,220 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:22,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:22,220 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:22,221 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:22,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:22,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:22,221 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:22,229 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:22,229 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:22,305 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:22,305 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:22,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:22,354 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:22,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:23,368 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:23,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:23,388 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:23,403 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:23,404 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:23,571 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:23,571 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:23,579 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:23,630 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:23,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:24,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:24,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 52 [2018-10-22 16:10:24,188 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:24,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-22 16:10:24,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-22 16:10:24,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:24,189 INFO L87 Difference]: Start difference. First operand 298 states and 332 transitions. Second operand 41 states. [2018-10-22 16:10:24,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:24,363 INFO L93 Difference]: Finished difference Result 445 states and 514 transitions. [2018-10-22 16:10:24,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-22 16:10:24,363 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 297 [2018-10-22 16:10:24,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:24,364 INFO L225 Difference]: With dead ends: 445 [2018-10-22 16:10:24,364 INFO L226 Difference]: Without dead ends: 303 [2018-10-22 16:10:24,365 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1227 GetRequests, 1121 SyntacticMatches, 56 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1372 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:24,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-10-22 16:10:24,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 302. [2018-10-22 16:10:24,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2018-10-22 16:10:24,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 336 transitions. [2018-10-22 16:10:24,436 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 336 transitions. Word has length 297 [2018-10-22 16:10:24,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:24,436 INFO L481 AbstractCegarLoop]: Abstraction has 302 states and 336 transitions. [2018-10-22 16:10:24,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-22 16:10:24,437 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 336 transitions. [2018-10-22 16:10:24,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2018-10-22 16:10:24,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:24,439 INFO L375 BasicCegarLoop]: trace histogram [73, 73, 72, 39, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:24,439 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:24,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:24,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1741753672, now seen corresponding path program 39 times [2018-10-22 16:10:24,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:24,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:24,440 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:24,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:24,441 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:24,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:26,018 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:26,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,018 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:26,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:26,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:26,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:26,019 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:26,026 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:26,026 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:26,163 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 73 check-sat command(s) [2018-10-22 16:10:26,163 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:26,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:26,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:26,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:27,160 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:27,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:27,181 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:27,196 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:27,196 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:28,590 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 73 check-sat command(s) [2018-10-22 16:10:28,591 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:28,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:28,650 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:28,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:29,272 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:29,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:29,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42, 42, 42] total 52 [2018-10-22 16:10:29,274 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:29,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 16:10:29,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 16:10:29,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:29,276 INFO L87 Difference]: Start difference. First operand 302 states and 336 transitions. Second operand 42 states. [2018-10-22 16:10:29,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:29,470 INFO L93 Difference]: Finished difference Result 449 states and 518 transitions. [2018-10-22 16:10:29,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-22 16:10:29,470 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 301 [2018-10-22 16:10:29,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:29,472 INFO L225 Difference]: With dead ends: 449 [2018-10-22 16:10:29,472 INFO L226 Difference]: Without dead ends: 307 [2018-10-22 16:10:29,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1244 GetRequests, 1134 SyntacticMatches, 60 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1470 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:29,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-22 16:10:29,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 306. [2018-10-22 16:10:29,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-10-22 16:10:29,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 340 transitions. [2018-10-22 16:10:29,525 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 340 transitions. Word has length 301 [2018-10-22 16:10:29,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:29,525 INFO L481 AbstractCegarLoop]: Abstraction has 306 states and 340 transitions. [2018-10-22 16:10:29,525 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 16:10:29,525 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 340 transitions. [2018-10-22 16:10:29,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2018-10-22 16:10:29,526 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:29,526 INFO L375 BasicCegarLoop]: trace histogram [74, 74, 73, 40, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:29,527 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:29,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:29,527 INFO L82 PathProgramCache]: Analyzing trace with hash -825554970, now seen corresponding path program 40 times [2018-10-22 16:10:29,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:29,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:29,528 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:29,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:29,528 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:29,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:30,727 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:30,727 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:30,727 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:30,727 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:30,727 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:30,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:30,728 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:30,735 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:30,735 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:30,812 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:30,812 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:30,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:30,868 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:30,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:31,927 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:31,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:31,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:31,963 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:10:31,963 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:10:32,142 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:10:32,143 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:32,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:32,221 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:32,221 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:32,858 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:32,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:32,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 52 [2018-10-22 16:10:32,860 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:32,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-22 16:10:32,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-22 16:10:32,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:32,862 INFO L87 Difference]: Start difference. First operand 306 states and 340 transitions. Second operand 43 states. [2018-10-22 16:10:33,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:33,124 INFO L93 Difference]: Finished difference Result 453 states and 522 transitions. [2018-10-22 16:10:33,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:10:33,124 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 305 [2018-10-22 16:10:33,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:33,126 INFO L225 Difference]: With dead ends: 453 [2018-10-22 16:10:33,126 INFO L226 Difference]: Without dead ends: 311 [2018-10-22 16:10:33,127 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1261 GetRequests, 1147 SyntacticMatches, 64 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:33,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2018-10-22 16:10:33,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 310. [2018-10-22 16:10:33,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-10-22 16:10:33,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 344 transitions. [2018-10-22 16:10:33,203 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 344 transitions. Word has length 305 [2018-10-22 16:10:33,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:33,204 INFO L481 AbstractCegarLoop]: Abstraction has 310 states and 344 transitions. [2018-10-22 16:10:33,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-22 16:10:33,204 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 344 transitions. [2018-10-22 16:10:33,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-10-22 16:10:33,206 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:33,206 INFO L375 BasicCegarLoop]: trace histogram [75, 75, 74, 41, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:33,206 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:33,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:33,207 INFO L82 PathProgramCache]: Analyzing trace with hash -2116233708, now seen corresponding path program 41 times [2018-10-22 16:10:33,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:33,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:33,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:33,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:33,208 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:33,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:35,729 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:35,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,729 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:35,730 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:35,730 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:35,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:35,730 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:35,739 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:35,739 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:35,877 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 75 check-sat command(s) [2018-10-22 16:10:35,878 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:35,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:35,937 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:35,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:36,880 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:36,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:36,902 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:36,917 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:10:36,917 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:38,297 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 75 check-sat command(s) [2018-10-22 16:10:38,297 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:38,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:38,360 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:38,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:39,047 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:39,048 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:39,049 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 52 [2018-10-22 16:10:39,049 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:39,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-22 16:10:39,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-22 16:10:39,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:39,050 INFO L87 Difference]: Start difference. First operand 310 states and 344 transitions. Second operand 44 states. [2018-10-22 16:10:39,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:39,235 INFO L93 Difference]: Finished difference Result 457 states and 526 transitions. [2018-10-22 16:10:39,235 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-22 16:10:39,235 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 309 [2018-10-22 16:10:39,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:39,237 INFO L225 Difference]: With dead ends: 457 [2018-10-22 16:10:39,237 INFO L226 Difference]: Without dead ends: 315 [2018-10-22 16:10:39,237 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1278 GetRequests, 1160 SyntacticMatches, 68 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:39,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2018-10-22 16:10:39,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2018-10-22 16:10:39,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2018-10-22 16:10:39,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 348 transitions. [2018-10-22 16:10:39,290 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 348 transitions. Word has length 309 [2018-10-22 16:10:39,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:39,290 INFO L481 AbstractCegarLoop]: Abstraction has 314 states and 348 transitions. [2018-10-22 16:10:39,291 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-22 16:10:39,291 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 348 transitions. [2018-10-22 16:10:39,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2018-10-22 16:10:39,292 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:39,292 INFO L375 BasicCegarLoop]: trace histogram [76, 76, 75, 42, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:39,292 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:39,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:39,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1646273214, now seen corresponding path program 42 times [2018-10-22 16:10:39,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:39,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:39,293 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:39,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:39,294 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:39,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:40,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:40,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:40,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:40,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:40,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:40,863 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:40,870 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:40,871 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:41,000 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2018-10-22 16:10:41,000 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:41,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:41,063 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:41,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:41,989 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:42,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:42,009 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:42,024 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:42,024 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:43,406 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2018-10-22 16:10:43,406 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:43,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:43,470 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:43,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:44,196 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:44,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:44,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 52 [2018-10-22 16:10:44,198 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:44,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-22 16:10:44,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-22 16:10:44,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:44,199 INFO L87 Difference]: Start difference. First operand 314 states and 348 transitions. Second operand 45 states. [2018-10-22 16:10:44,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:44,382 INFO L93 Difference]: Finished difference Result 461 states and 530 transitions. [2018-10-22 16:10:44,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-22 16:10:44,383 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 313 [2018-10-22 16:10:44,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:44,384 INFO L225 Difference]: With dead ends: 461 [2018-10-22 16:10:44,384 INFO L226 Difference]: Without dead ends: 319 [2018-10-22 16:10:44,384 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1295 GetRequests, 1173 SyntacticMatches, 72 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1764 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:44,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-22 16:10:44,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 318. [2018-10-22 16:10:44,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-10-22 16:10:44,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 352 transitions. [2018-10-22 16:10:44,444 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 352 transitions. Word has length 313 [2018-10-22 16:10:44,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:44,445 INFO L481 AbstractCegarLoop]: Abstraction has 318 states and 352 transitions. [2018-10-22 16:10:44,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-22 16:10:44,445 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 352 transitions. [2018-10-22 16:10:44,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2018-10-22 16:10:44,446 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:44,446 INFO L375 BasicCegarLoop]: trace histogram [77, 77, 76, 43, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:44,446 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:44,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:44,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1703910768, now seen corresponding path program 43 times [2018-10-22 16:10:44,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:44,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:44,448 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:44,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:44,448 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:44,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:46,099 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:46,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:46,100 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:46,100 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:46,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:46,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:46,100 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:46,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:46,108 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:46,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:46,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:46,251 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:46,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:47,228 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:47,248 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:47,249 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:47,265 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:47,266 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:47,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:47,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:47,498 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:47,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:48,272 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:48,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:48,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 46, 46] total 52 [2018-10-22 16:10:48,274 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:48,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 16:10:48,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 16:10:48,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:48,275 INFO L87 Difference]: Start difference. First operand 318 states and 352 transitions. Second operand 46 states. [2018-10-22 16:10:48,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:48,495 INFO L93 Difference]: Finished difference Result 465 states and 534 transitions. [2018-10-22 16:10:48,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:10:48,495 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 317 [2018-10-22 16:10:48,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:48,497 INFO L225 Difference]: With dead ends: 465 [2018-10-22 16:10:48,497 INFO L226 Difference]: Without dead ends: 323 [2018-10-22 16:10:48,497 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1312 GetRequests, 1186 SyntacticMatches, 76 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1862 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:48,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2018-10-22 16:10:48,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 322. [2018-10-22 16:10:48,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 322 states. [2018-10-22 16:10:48,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 356 transitions. [2018-10-22 16:10:48,571 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 356 transitions. Word has length 317 [2018-10-22 16:10:48,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:48,571 INFO L481 AbstractCegarLoop]: Abstraction has 322 states and 356 transitions. [2018-10-22 16:10:48,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-22 16:10:48,572 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 356 transitions. [2018-10-22 16:10:48,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2018-10-22 16:10:48,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:48,574 INFO L375 BasicCegarLoop]: trace histogram [78, 78, 77, 44, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:48,574 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:48,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:48,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1374131870, now seen corresponding path program 44 times [2018-10-22 16:10:48,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:48,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:48,575 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:48,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:48,576 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:48,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:49,493 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:49,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:49,493 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:49,494 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:49,494 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:49,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:49,494 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:49,501 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:49,501 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:49,584 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:49,584 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:49,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:49,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:50,930 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:50,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:50,950 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:50,964 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:50,965 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:51,145 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:51,145 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:51,153 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:51,209 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:51,209 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:52,004 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:52,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:52,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 52 [2018-10-22 16:10:52,006 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:52,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-22 16:10:52,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-22 16:10:52,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:52,007 INFO L87 Difference]: Start difference. First operand 322 states and 356 transitions. Second operand 47 states. [2018-10-22 16:10:52,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:52,221 INFO L93 Difference]: Finished difference Result 469 states and 538 transitions. [2018-10-22 16:10:52,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-22 16:10:52,221 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 321 [2018-10-22 16:10:52,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:52,223 INFO L225 Difference]: With dead ends: 469 [2018-10-22 16:10:52,223 INFO L226 Difference]: Without dead ends: 327 [2018-10-22 16:10:52,223 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1329 GetRequests, 1199 SyntacticMatches, 80 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1960 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:10:52,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-10-22 16:10:52,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 326. [2018-10-22 16:10:52,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 326 states. [2018-10-22 16:10:52,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 360 transitions. [2018-10-22 16:10:52,280 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 360 transitions. Word has length 321 [2018-10-22 16:10:52,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:52,280 INFO L481 AbstractCegarLoop]: Abstraction has 326 states and 360 transitions. [2018-10-22 16:10:52,280 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-22 16:10:52,280 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 360 transitions. [2018-10-22 16:10:52,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-10-22 16:10:52,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:52,283 INFO L375 BasicCegarLoop]: trace histogram [79, 79, 78, 45, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:52,284 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:52,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:52,284 INFO L82 PathProgramCache]: Analyzing trace with hash -232568628, now seen corresponding path program 45 times [2018-10-22 16:10:52,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:52,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:52,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:52,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:52,285 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:52,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:53,252 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 6084 proven. 4095 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:53,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:53,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:53,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:53,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:53,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:53,262 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:53,262 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:53,416 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 79 check-sat command(s) [2018-10-22 16:10:53,416 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:53,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:55,041 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 7768 proven. 4423 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2018-10-22 16:10:55,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:57,630 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 7768 proven. 4423 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2018-10-22 16:10:57,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:57,650 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:57,665 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:10:57,665 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:10:59,266 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 79 check-sat command(s) [2018-10-22 16:10:59,266 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:59,274 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:59,335 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 6084 proven. 4095 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:10:59,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:00,348 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 6084 proven. 4095 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-22 16:11:00,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:00,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48, 48, 48] total 109 [2018-10-22 16:11:00,365 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:00,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-10-22 16:11:00,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-10-22 16:11:00,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3036, Invalid=8736, Unknown=0, NotChecked=0, Total=11772 [2018-10-22 16:11:00,367 INFO L87 Difference]: Start difference. First operand 326 states and 360 transitions. Second operand 94 states. [2018-10-22 16:11:03,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:03,547 INFO L93 Difference]: Finished difference Result 2117 states and 2606 transitions. [2018-10-22 16:11:03,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-10-22 16:11:03,547 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 325 [2018-10-22 16:11:03,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:03,553 INFO L225 Difference]: With dead ends: 2117 [2018-10-22 16:11:03,553 INFO L226 Difference]: Without dead ends: 1975 [2018-10-22 16:11:03,556 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1437 GetRequests, 1129 SyntacticMatches, 110 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15758 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=8995, Invalid=30805, Unknown=0, NotChecked=0, Total=39800 [2018-10-22 16:11:03,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1975 states. [2018-10-22 16:11:03,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1975 to 378. [2018-10-22 16:11:03,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 378 states. [2018-10-22 16:11:03,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 424 transitions. [2018-10-22 16:11:03,697 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 424 transitions. Word has length 325 [2018-10-22 16:11:03,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:03,698 INFO L481 AbstractCegarLoop]: Abstraction has 378 states and 424 transitions. [2018-10-22 16:11:03,698 INFO L482 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-10-22 16:11:03,698 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 424 transitions. [2018-10-22 16:11:03,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 378 [2018-10-22 16:11:03,699 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:03,699 INFO L375 BasicCegarLoop]: trace histogram [92, 92, 91, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:03,700 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:03,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:03,700 INFO L82 PathProgramCache]: Analyzing trace with hash -597581558, now seen corresponding path program 46 times [2018-10-22 16:11:03,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:03,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:03,701 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:03,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:03,701 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:03,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:04,838 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:04,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:04,838 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:04,838 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:04,838 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:04,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:04,839 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:04,846 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:04,846 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:04,944 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:04,944 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:04,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:05,038 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:05,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:06,183 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:06,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:06,203 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:06,223 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:06,223 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:06,458 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:06,458 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:06,470 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:06,551 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:07,417 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:07,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:07,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 52 [2018-10-22 16:11:07,419 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:07,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-22 16:11:07,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-22 16:11:07,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:07,421 INFO L87 Difference]: Start difference. First operand 378 states and 424 transitions. Second operand 49 states. [2018-10-22 16:11:07,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:07,689 INFO L93 Difference]: Finished difference Result 573 states and 666 transitions. [2018-10-22 16:11:07,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:11:07,690 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 377 [2018-10-22 16:11:07,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:07,691 INFO L225 Difference]: With dead ends: 573 [2018-10-22 16:11:07,691 INFO L226 Difference]: Without dead ends: 383 [2018-10-22 16:11:07,692 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1555 GetRequests, 1417 SyntacticMatches, 88 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2156 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:07,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2018-10-22 16:11:07,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 382. [2018-10-22 16:11:07,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2018-10-22 16:11:07,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 428 transitions. [2018-10-22 16:11:07,829 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 428 transitions. Word has length 377 [2018-10-22 16:11:07,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:07,829 INFO L481 AbstractCegarLoop]: Abstraction has 382 states and 428 transitions. [2018-10-22 16:11:07,829 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-22 16:11:07,829 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 428 transitions. [2018-10-22 16:11:07,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 382 [2018-10-22 16:11:07,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:07,832 INFO L375 BasicCegarLoop]: trace histogram [93, 93, 92, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:07,832 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:07,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:07,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1048113464, now seen corresponding path program 47 times [2018-10-22 16:11:07,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:07,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:07,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:07,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:07,834 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:07,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:08,957 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:08,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:08,958 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:08,958 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:08,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:08,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:08,958 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:08,968 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:08,968 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:09,164 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 93 check-sat command(s) [2018-10-22 16:11:09,164 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:09,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:09,248 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:09,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:10,214 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:10,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:10,234 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:10,249 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:11:10,250 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:12,290 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 93 check-sat command(s) [2018-10-22 16:11:12,290 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:12,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:12,394 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:12,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:13,293 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:13,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:13,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 52 [2018-10-22 16:11:13,295 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:13,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-22 16:11:13,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-22 16:11:13,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:13,297 INFO L87 Difference]: Start difference. First operand 382 states and 428 transitions. Second operand 50 states. [2018-10-22 16:11:13,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:13,594 INFO L93 Difference]: Finished difference Result 577 states and 670 transitions. [2018-10-22 16:11:13,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-22 16:11:13,594 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 381 [2018-10-22 16:11:13,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:13,596 INFO L225 Difference]: With dead ends: 577 [2018-10-22 16:11:13,596 INFO L226 Difference]: Without dead ends: 387 [2018-10-22 16:11:13,596 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1572 GetRequests, 1430 SyntacticMatches, 92 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2254 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:13,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-10-22 16:11:13,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2018-10-22 16:11:13,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2018-10-22 16:11:13,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 432 transitions. [2018-10-22 16:11:13,726 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 432 transitions. Word has length 381 [2018-10-22 16:11:13,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:13,726 INFO L481 AbstractCegarLoop]: Abstraction has 386 states and 432 transitions. [2018-10-22 16:11:13,726 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-22 16:11:13,726 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 432 transitions. [2018-10-22 16:11:13,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2018-10-22 16:11:13,728 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:13,729 INFO L375 BasicCegarLoop]: trace histogram [94, 94, 93, 48, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:13,729 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:13,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:13,730 INFO L82 PathProgramCache]: Analyzing trace with hash 653294182, now seen corresponding path program 48 times [2018-10-22 16:11:13,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:13,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:13,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:13,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:13,731 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:13,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:14,961 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:14,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:14,961 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:14,962 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:14,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:14,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:14,962 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:14,968 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:14,969 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:15,280 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 92 check-sat command(s) [2018-10-22 16:11:15,280 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:15,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:15,382 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:15,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:16,472 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:16,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:16,493 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:16,508 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:11:16,508 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:11:18,623 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 92 check-sat command(s) [2018-10-22 16:11:18,624 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:18,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:18,713 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:18,713 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:19,682 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:19,684 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:19,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 52 [2018-10-22 16:11:19,684 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:19,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:11:19,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:11:19,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:19,686 INFO L87 Difference]: Start difference. First operand 386 states and 432 transitions. Second operand 51 states. [2018-10-22 16:11:19,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:19,990 INFO L93 Difference]: Finished difference Result 581 states and 674 transitions. [2018-10-22 16:11:19,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:11:19,991 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 385 [2018-10-22 16:11:19,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:19,992 INFO L225 Difference]: With dead ends: 581 [2018-10-22 16:11:19,992 INFO L226 Difference]: Without dead ends: 391 [2018-10-22 16:11:19,993 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1589 GetRequests, 1443 SyntacticMatches, 96 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2352 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:19,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2018-10-22 16:11:20,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 390. [2018-10-22 16:11:20,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 390 states. [2018-10-22 16:11:20,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 436 transitions. [2018-10-22 16:11:20,114 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 436 transitions. Word has length 385 [2018-10-22 16:11:20,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:20,115 INFO L481 AbstractCegarLoop]: Abstraction has 390 states and 436 transitions. [2018-10-22 16:11:20,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:11:20,115 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 436 transitions. [2018-10-22 16:11:20,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2018-10-22 16:11:20,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:20,117 INFO L375 BasicCegarLoop]: trace histogram [95, 95, 94, 49, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:20,117 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:20,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:20,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1996243820, now seen corresponding path program 49 times [2018-10-22 16:11:20,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:20,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:20,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:20,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:20,118 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:20,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:21,277 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:21,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:21,277 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:21,277 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:21,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:21,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:21,278 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:21,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:21,286 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:21,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:21,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:21,473 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:21,474 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:22,468 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:22,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:22,488 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:22,503 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:22,503 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:11:22,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:22,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:22,797 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:22,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:23,789 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 16:11:23,791 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:23,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52, 52, 52] total 52 [2018-10-22 16:11:23,791 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:23,792 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-22 16:11:23,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-22 16:11:23,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:23,793 INFO L87 Difference]: Start difference. First operand 390 states and 436 transitions. Second operand 52 states. [2018-10-22 16:11:24,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:24,153 INFO L93 Difference]: Finished difference Result 628 states and 721 transitions. [2018-10-22 16:11:24,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-22 16:11:24,157 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 389 [2018-10-22 16:11:24,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:24,159 INFO L225 Difference]: With dead ends: 628 [2018-10-22 16:11:24,159 INFO L226 Difference]: Without dead ends: 438 [2018-10-22 16:11:24,160 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1606 GetRequests, 1456 SyntacticMatches, 100 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 16:11:24,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2018-10-22 16:11:24,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 394. [2018-10-22 16:11:24,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-10-22 16:11:24,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 440 transitions. [2018-10-22 16:11:24,294 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 440 transitions. Word has length 389 [2018-10-22 16:11:24,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:24,294 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 440 transitions. [2018-10-22 16:11:24,294 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-22 16:11:24,295 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 440 transitions. [2018-10-22 16:11:24,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 394 [2018-10-22 16:11:24,297 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:24,297 INFO L375 BasicCegarLoop]: trace histogram [96, 96, 95, 50, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:24,297 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:24,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:24,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1311651778, now seen corresponding path program 50 times [2018-10-22 16:11:24,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:24,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:24,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:11:24,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:24,299 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:24,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:25,891 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-10-22 16:11:25,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:25,891 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:25,891 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:25,891 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:25,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:25,891 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:25,899 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:25,899 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:26,002 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:26,002 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:26,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:26,139 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-10-22 16:11:26,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:28,007 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-10-22 16:11:28,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:28,027 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:28,042 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:11:28,042 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:11:28,261 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:11:28,261 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:28,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:28,446 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9583 proven. 8476 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-10-22 16:11:28,447 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:30,153 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-10-22 16:11:30,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:30,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53, 53, 52] total 58 [2018-10-22 16:11:30,155 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:30,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-22 16:11:30,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-22 16:11:30,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1603, Invalid=1703, Unknown=0, NotChecked=0, Total=3306 [2018-10-22 16:11:30,156 INFO L87 Difference]: Start difference. First operand 394 states and 440 transitions. Second operand 53 states. [2018-10-22 16:11:31,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:31,215 INFO L93 Difference]: Finished difference Result 1324 states and 1604 transitions. [2018-10-22 16:11:31,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-22 16:11:31,216 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 393 [2018-10-22 16:11:31,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:31,223 INFO L225 Difference]: With dead ends: 1324 [2018-10-22 16:11:31,223 INFO L226 Difference]: Without dead ends: 1319 [2018-10-22 16:11:31,224 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1669 GetRequests, 1427 SyntacticMatches, 186 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6215 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1603, Invalid=1703, Unknown=0, NotChecked=0, Total=3306 [2018-10-22 16:11:31,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1319 states. [2018-10-22 16:11:31,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1319 to 414. [2018-10-22 16:11:31,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2018-10-22 16:11:31,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 465 transitions. [2018-10-22 16:11:31,408 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 465 transitions. Word has length 393 [2018-10-22 16:11:31,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:31,409 INFO L481 AbstractCegarLoop]: Abstraction has 414 states and 465 transitions. [2018-10-22 16:11:31,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-22 16:11:31,409 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 465 transitions. [2018-10-22 16:11:31,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2018-10-22 16:11:31,412 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:31,412 INFO L375 BasicCegarLoop]: trace histogram [101, 101, 100, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:31,412 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:31,412 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:31,412 INFO L82 PathProgramCache]: Analyzing trace with hash 2099862750, now seen corresponding path program 51 times [2018-10-22 16:11:31,412 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:31,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:31,413 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:31,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:31,413 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:31,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:33,383 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-10-22 16:11:33,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:33,383 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:33,384 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:33,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:33,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:33,384 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:33,392 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:33,392 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:33,549 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-22 16:11:33,549 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:33,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:33,802 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-10-22 16:11:33,803 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:34,313 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-10-22 16:11:34,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:34,333 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:34,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:11:34,348 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:11:35,634 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-22 16:11:35,634 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:35,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:36,032 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-10-22 16:11:36,032 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:36,341 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-10-22 16:11:36,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:36,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57, 57, 57] total 59 [2018-10-22 16:11:36,343 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:36,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-22 16:11:36,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-22 16:11:36,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3303, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:11:36,345 INFO L87 Difference]: Start difference. First operand 414 states and 465 transitions. Second operand 57 states. [2018-10-22 16:11:44,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:11:44,963 INFO L93 Difference]: Finished difference Result 5825 states and 7252 transitions. [2018-10-22 16:11:44,963 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-22 16:11:44,963 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 413 [2018-10-22 16:11:44,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:11:44,984 INFO L225 Difference]: With dead ends: 5825 [2018-10-22 16:11:44,984 INFO L226 Difference]: Without dead ends: 5612 [2018-10-22 16:11:44,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1708 GetRequests, 1640 SyntacticMatches, 10 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=125, Invalid=3415, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:11:44,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5612 states. [2018-10-22 16:11:49,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5612 to 5563. [2018-10-22 16:11:49,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5563 states. [2018-10-22 16:11:49,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5563 states to 5563 states and 5663 transitions. [2018-10-22 16:11:49,427 INFO L78 Accepts]: Start accepts. Automaton has 5563 states and 5663 transitions. Word has length 413 [2018-10-22 16:11:49,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:11:49,428 INFO L481 AbstractCegarLoop]: Abstraction has 5563 states and 5663 transitions. [2018-10-22 16:11:49,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-22 16:11:49,428 INFO L276 IsEmpty]: Start isEmpty. Operand 5563 states and 5663 transitions. [2018-10-22 16:11:49,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 418 [2018-10-22 16:11:49,431 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:11:49,431 INFO L375 BasicCegarLoop]: trace histogram [102, 102, 101, 52, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:11:49,431 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:11:49,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:11:49,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1583456842, now seen corresponding path program 52 times [2018-10-22 16:11:49,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:11:49,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:49,433 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:11:49,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:11:49,433 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:11:49,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:11:50,745 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 16:11:50,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:50,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:11:50,745 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:11:50,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:11:50,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:50,746 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:11:50,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:50,754 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:50,862 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:50,862 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:50,868 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:51,070 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 16:11:51,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:53,094 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 16:11:53,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:11:53,115 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:11:53,130 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:11:53,130 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:11:53,379 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:11:53,379 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:11:53,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:11:53,536 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 16:11:53,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:11:55,492 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 16:11:55,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:11:55,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54, 54, 54] total 54 [2018-10-22 16:11:55,494 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:11:55,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-22 16:11:55,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-22 16:11:55,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:11:55,495 INFO L87 Difference]: Start difference. First operand 5563 states and 5663 transitions. Second operand 54 states. [2018-10-22 16:12:00,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:00,576 INFO L93 Difference]: Finished difference Result 11127 states and 11328 transitions. [2018-10-22 16:12:00,576 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-22 16:12:00,576 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 417 [2018-10-22 16:12:00,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:00,591 INFO L225 Difference]: With dead ends: 11127 [2018-10-22 16:12:00,591 INFO L226 Difference]: Without dead ends: 5567 [2018-10-22 16:12:00,599 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1770 GetRequests, 1514 SyntacticMatches, 204 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5800 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:12:00,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5567 states. [2018-10-22 16:12:04,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5567 to 5567. [2018-10-22 16:12:04,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5567 states. [2018-10-22 16:12:04,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5567 states to 5567 states and 5667 transitions. [2018-10-22 16:12:04,932 INFO L78 Accepts]: Start accepts. Automaton has 5567 states and 5667 transitions. Word has length 417 [2018-10-22 16:12:04,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:04,933 INFO L481 AbstractCegarLoop]: Abstraction has 5567 states and 5667 transitions. [2018-10-22 16:12:04,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-22 16:12:04,933 INFO L276 IsEmpty]: Start isEmpty. Operand 5567 states and 5667 transitions. [2018-10-22 16:12:04,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 422 [2018-10-22 16:12:04,935 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:12:04,935 INFO L375 BasicCegarLoop]: trace histogram [103, 103, 102, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:12:04,935 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:12:04,935 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:12:04,935 INFO L82 PathProgramCache]: Analyzing trace with hash -273634184, now seen corresponding path program 53 times [2018-10-22 16:12:04,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:12:04,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:04,936 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:12:04,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:12:04,936 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:12:04,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:12:06,090 INFO L134 CoverageAnalysis]: Checked inductivity of 21012 backedges. 15656 proven. 0 refuted. 0 times theorem prover too weak. 5356 trivial. 0 not checked. [2018-10-22 16:12:06,090 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:12:06,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2018-10-22 16:12:06,090 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:12:06,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-22 16:12:06,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-22 16:12:06,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:12:06,091 INFO L87 Difference]: Start difference. First operand 5567 states and 5667 transitions. Second operand 53 states. [2018-10-22 16:12:06,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:12:06,508 INFO L93 Difference]: Finished difference Result 5567 states and 5667 transitions. [2018-10-22 16:12:06,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-22 16:12:06,508 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 421 [2018-10-22 16:12:06,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:12:06,509 INFO L225 Difference]: With dead ends: 5567 [2018-10-22 16:12:06,509 INFO L226 Difference]: Without dead ends: 0 [2018-10-22 16:12:06,517 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:12:06,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-22 16:12:06,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-22 16:12:06,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-22 16:12:06,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-22 16:12:06,518 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 421 [2018-10-22 16:12:06,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:12:06,518 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-22 16:12:06,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-22 16:12:06,518 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-22 16:12:06,518 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-22 16:12:06,523 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-22 16:12:16,177 WARN L179 SmtUtils]: Spent 9.64 s on a formula simplification. DAG size of input: 1852 DAG size of output: 1441 Received shutdown request... [2018-10-22 16:12:43,126 WARN L187 SmtUtils]: Removed 44 from assertion stack [2018-10-22 16:12:43,127 INFO L256 ToolchainWalker]: Toolchain cancelled while executing plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction. Reason: Timeout or Toolchain cancelled by user [2018-10-22 16:12:43,128 INFO L168 Benchmark]: Toolchain (without parser) took 231019.08 ms. Allocated memory was 1.5 GB in the beginning and 3.1 GB in the end (delta: 1.6 GB). Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 9.1 MB). Peak memory consumption was 1.6 GB. Max. memory is 7.1 GB. [2018-10-22 16:12:43,128 INFO L168 Benchmark]: CDTParser took 0.48 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:12:43,129 INFO L168 Benchmark]: CACSL2BoogieTranslator took 261.04 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:12:43,129 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.09 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:12:43,130 INFO L168 Benchmark]: Boogie Preprocessor took 25.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:12:43,130 INFO L168 Benchmark]: RCFGBuilder took 344.47 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 690.5 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -741.4 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-22 16:12:43,131 INFO L168 Benchmark]: TraceAbstraction took 230360.47 ms. Allocated memory was 2.2 GB in the beginning and 3.1 GB in the end (delta: 882.9 MB). Free memory was 2.1 GB in the beginning and 1.4 GB in the end (delta: 740.0 MB). Peak memory consumption was 1.6 GB. Max. memory is 7.1 GB. [2018-10-22 16:12:43,133 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.48 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 261.04 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 23.09 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 25.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 344.47 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 690.5 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -741.4 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230360.47 ms. Allocated memory was 2.2 GB in the beginning and 3.1 GB in the end (delta: 882.9 MB). Free memory was 2.1 GB in the beginning and 1.4 GB in the end (delta: 740.0 MB). Peak memory consumption was 1.6 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - TimeoutResult: Timeout (de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction) Toolchain cancelled while SimplifyDDAWithTimeout was simplifying term of DAG size 1420. RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown