java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:00:37,639 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:00:37,641 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:00:37,654 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:00:37,654 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:00:37,656 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:00:37,657 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:00:37,662 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:00:37,666 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:00:37,670 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:00:37,671 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:00:37,672 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:00:37,676 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:00:37,677 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:00:37,681 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:00:37,682 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:00:37,682 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:00:37,684 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:00:37,686 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:00:37,687 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:00:37,690 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:00:37,691 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:00:37,693 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:00:37,696 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:00:37,697 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:00:37,697 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:00:37,698 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:00:37,701 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:00:37,702 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:00:37,703 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:00:37,703 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:00:37,705 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-22 16:00:37,707 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 16:00:37,737 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:00:37,738 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:00:37,739 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:00:37,742 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:00:37,742 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:00:37,743 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:00:37,743 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:00:37,743 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:00:37,743 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:00:37,744 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:00:37,744 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:00:37,744 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:00:37,745 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:00:37,746 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:00:37,746 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:00:37,746 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:00:37,746 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:00:37,746 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:00:37,746 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:00:37,747 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:00:37,747 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:00:37,747 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:00:37,747 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:00:37,748 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:00:37,748 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:37,748 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:00:37,748 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:00:37,748 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:00:37,749 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:00:37,749 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:00:37,749 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:00:37,749 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:00:37,749 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:00:37,750 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:00:37,794 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:00:37,807 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:00:37,811 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:00:37,813 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:00:37,813 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:00:37,814 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-22 16:00:37,873 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9f4be889b/270242aa08534eaca10758c4f2d82ba2/FLAG323bbea7f [2018-10-22 16:00:38,356 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:00:38,357 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-22 16:00:38,364 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9f4be889b/270242aa08534eaca10758c4f2d82ba2/FLAG323bbea7f [2018-10-22 16:00:38,381 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9f4be889b/270242aa08534eaca10758c4f2d82ba2 [2018-10-22 16:00:38,392 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:00:38,394 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:00:38,395 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:38,395 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:00:38,399 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:00:38,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d964e23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38, skipping insertion in model container [2018-10-22 16:00:38,403 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,412 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:00:38,433 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:00:38,638 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:38,643 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:00:38,664 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:38,684 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:00:38,685 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38 WrapperNode [2018-10-22 16:00:38,685 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:38,686 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:38,686 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:00:38,686 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:00:38,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,702 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,711 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:38,711 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:00:38,711 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:00:38,712 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:00:38,723 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,724 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,724 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,729 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,735 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,736 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (1/1) ... [2018-10-22 16:00:38,737 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:00:38,738 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:00:38,739 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:00:38,739 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:00:38,740 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (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 16:00:38,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:00:38,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:00:38,818 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:00:38,819 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:00:38,819 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:00:38,819 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:00:38,819 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:00:38,819 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:00:39,101 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:00:39,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:39 BoogieIcfgContainer [2018-10-22 16:00:39,102 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:00:39,103 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:00:39,103 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:00:39,106 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:00:39,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:00:38" (1/3) ... [2018-10-22 16:00:39,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69c651a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:39, skipping insertion in model container [2018-10-22 16:00:39,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:38" (2/3) ... [2018-10-22 16:00:39,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69c651a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:39, skipping insertion in model container [2018-10-22 16:00:39,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:39" (3/3) ... [2018-10-22 16:00:39,113 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call1.i [2018-10-22 16:00:39,125 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:00:39,137 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:00:39,156 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:00:39,189 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:00:39,190 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:00:39,190 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:00:39,190 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:00:39,190 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:00:39,191 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:00:39,191 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:00:39,191 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:00:39,191 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:00:39,211 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-22 16:00:39,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 16:00:39,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,219 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,221 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,228 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-22 16:00:39,231 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:39,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,290 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:39,356 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 16:00:39,358 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:39,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:00:39,359 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:39,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:00:39,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:00:39,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:39,380 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-22 16:00:39,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:39,402 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-22 16:00:39,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:00:39,403 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 16:00:39,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:39,412 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:00:39,413 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 16:00:39,416 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 16:00:39,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 16:00:39,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 16:00:39,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 16:00:39,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 16:00:39,453 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-22 16:00:39,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:39,453 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 16:00:39,454 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:00:39,454 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 16:00:39,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 16:00:39,455 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,455 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,455 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,456 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-22 16:00:39,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,458 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:39,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,458 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:39,617 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 16:00:39,617 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:39,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:39,618 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:39,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:39,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:39,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:39,621 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-22 16:00:39,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:39,671 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-22 16:00:39,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:39,672 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-22 16:00:39,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:39,673 INFO L225 Difference]: With dead ends: 19 [2018-10-22 16:00:39,674 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 16:00:39,675 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:39,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 16:00:39,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 16:00:39,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 16:00:39,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 16:00:39,690 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 16:00:39,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:39,691 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 16:00:39,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:39,691 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 16:00:39,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:00:39,692 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,692 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,692 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-22 16:00:39,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:39,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,695 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:39,854 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:39,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:39,855 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:39,856 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-22 16:00:39,858 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-22 16:00:39,909 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:39,909 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:40,023 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:00:40,384 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:40,387 INFO L272 AbstractInterpreter]: Visited 12 different actions 74 times. Merged at 3 different actions 28 times. Widened at 1 different actions 6 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-22 16:00:40,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:40,436 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:40,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,436 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 16:00:40,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:40,457 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:40,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:40,508 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:40,619 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:40,619 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:40,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:40,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,946 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 16:00:40,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:40,977 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:41,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:41,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:41,081 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:41,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,126 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:41,126 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-22 16:00:41,126 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:41,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-22 16:00:41,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-22 16:00:41,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:41,128 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-22 16:00:41,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:41,222 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 16:00:41,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 16:00:41,224 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-22 16:00:41,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:41,225 INFO L225 Difference]: With dead ends: 21 [2018-10-22 16:00:41,225 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 16:00:41,225 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-22 16:00:41,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 16:00:41,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 16:00:41,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 16:00:41,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 16:00:41,231 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 16:00:41,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:41,231 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 16:00:41,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-22 16:00:41,232 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 16:00:41,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:00:41,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:41,233 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:41,233 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:41,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:41,234 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-22 16:00:41,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:41,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:41,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:41,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:41,235 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:41,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:41,469 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,470 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:41,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:41,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:41,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,471 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:41,491 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:41,491 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:41,520 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:41,521 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:41,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:41,810 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,831 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 16:00:41,848 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:41,848 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:41,870 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:41,870 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:41,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:41,926 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,927 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:41,957 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:41,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:41,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-10-22 16:00:41,960 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:41,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:00:41,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:00:41,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:41,962 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-22 16:00:42,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:42,012 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-22 16:00:42,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:00:42,013 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-22 16:00:42,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:42,014 INFO L225 Difference]: With dead ends: 23 [2018-10-22 16:00:42,014 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:00:42,015 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-22 16:00:42,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:00:42,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 16:00:42,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:00:42,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 16:00:42,020 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 16:00:42,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:42,020 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 16:00:42,021 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:00:42,021 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 16:00:42,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:00:42,021 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:42,022 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:42,022 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:42,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:42,022 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-22 16:00:42,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:42,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:42,024 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:42,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:42,024 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:42,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:42,161 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,162 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:42,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:42,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:42,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,162 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 16:00:42,181 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:42,181 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:42,240 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:42,240 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:42,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:42,298 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:42,382 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,406 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 16:00:42,423 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:42,423 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:42,456 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:00:42,456 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:42,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:42,477 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:42,500 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:42,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-22 16:00:42,503 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:42,503 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:00:42,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:00:42,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:42,504 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-22 16:00:42,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:42,561 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-22 16:00:42,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:42,563 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-22 16:00:42,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:42,563 INFO L225 Difference]: With dead ends: 25 [2018-10-22 16:00:42,564 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 16:00:42,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:42,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 16:00:42,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 16:00:42,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 16:00:42,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 16:00:42,569 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 16:00:42,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:42,569 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 16:00:42,569 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:00:42,569 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 16:00:42,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 16:00:42,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:42,570 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:42,570 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:42,571 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:42,571 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-22 16:00:42,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:42,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:42,572 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:42,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:42,572 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:42,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:42,778 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,779 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:42,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:42,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:42,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:42,780 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 16:00:42,799 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:42,799 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:42,841 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:42,841 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:42,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:42,923 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:42,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,238 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:43,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,259 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 16:00:43,276 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:43,276 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:43,294 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:43,294 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:43,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:43,324 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:43,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,337 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:43,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:43,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-22 16:00:43,339 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:43,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:00:43,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:00:43,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:00:43,340 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-22 16:00:43,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:43,416 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 16:00:43,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:00:43,418 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-22 16:00:43,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:43,419 INFO L225 Difference]: With dead ends: 27 [2018-10-22 16:00:43,419 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 16:00:43,420 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-22 16:00:43,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 16:00:43,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 16:00:43,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 16:00:43,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 16:00:43,425 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 16:00:43,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:43,425 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 16:00:43,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:00:43,426 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 16:00:43,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 16:00:43,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:43,426 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:43,427 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:43,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:43,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-22 16:00:43,427 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:43,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:43,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:43,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:43,428 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:43,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:43,564 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:43,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,565 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:43,565 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:43,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:43,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,566 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 16:00:43,576 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:43,576 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:43,611 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:43,612 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:43,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:43,635 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:43,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,894 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:43,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,915 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 16:00:43,931 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:43,931 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:43,969 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 16:00:43,969 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:43,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,002 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,058 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,061 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:44,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:00:44,061 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:44,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 16:00:44,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 16:00:44,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:44,063 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-22 16:00:44,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:44,222 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-22 16:00:44,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:00:44,225 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-22 16:00:44,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:44,226 INFO L225 Difference]: With dead ends: 29 [2018-10-22 16:00:44,226 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 16:00:44,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:44,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 16:00:44,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 16:00:44,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 16:00:44,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 16:00:44,231 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 16:00:44,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:44,231 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 16:00:44,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 16:00:44,232 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 16:00:44,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 16:00:44,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:44,233 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:44,233 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:44,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:44,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-22 16:00:44,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:44,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,235 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:44,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,235 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:44,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:44,462 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,463 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:44,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:44,463 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:44,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,463 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 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 16:00:44,477 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:44,477 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:44,514 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:44,515 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:44,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,556 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,769 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,791 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 16:00:44,809 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:44,809 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:44,878 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 16:00:44,878 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:44,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,898 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,913 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:44,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:44,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-22 16:00:44,916 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:44,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:00:44,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:00:44,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:00:44,917 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-22 16:00:44,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:44,995 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-22 16:00:44,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:00:44,999 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-22 16:00:45,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:45,000 INFO L225 Difference]: With dead ends: 31 [2018-10-22 16:00:45,000 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 16:00:45,001 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-22 16:00:45,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 16:00:45,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 16:00:45,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 16:00:45,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 16:00:45,006 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-22 16:00:45,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:45,006 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 16:00:45,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:00:45,007 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 16:00:45,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 16:00:45,007 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:45,008 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:45,008 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:45,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:45,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-22 16:00:45,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:45,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:45,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,010 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:45,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,267 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:45,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,267 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:45,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:45,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:45,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,268 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 16:00:45,275 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:45,276 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:45,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:45,303 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:45,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,633 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:45,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,654 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 16:00:45,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:45,671 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:45,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:45,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:45,716 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:45,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,731 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:45,733 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:45,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-10-22 16:00:45,733 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:45,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:45,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:45,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:45,734 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-22 16:00:45,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:45,820 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-22 16:00:45,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:45,823 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-22 16:00:45,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:45,824 INFO L225 Difference]: With dead ends: 33 [2018-10-22 16:00:45,824 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 16:00:45,825 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:00:45,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 16:00:45,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-22 16:00:45,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 16:00:45,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-22 16:00:45,830 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-22 16:00:45,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:45,830 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-22 16:00:45,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:45,830 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-22 16:00:45,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 16:00:45,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:45,831 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:45,832 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:45,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:45,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-22 16:00:45,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:45,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:45,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:45,833 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:45,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:46,025 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:46,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,026 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:46,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:46,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:46,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,027 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 16:00:46,036 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:46,036 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:46,046 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:46,046 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:46,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,071 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:46,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,559 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:46,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:46,580 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 16:00:46,596 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:46,596 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:46,622 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:46,622 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:46,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,659 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:46,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,711 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:46,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:46,717 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-10-22 16:00:46,717 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:46,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:00:46,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:00:46,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:46,718 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-22 16:00:47,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:47,415 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-22 16:00:47,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:00:47,415 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-22 16:00:47,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:47,416 INFO L225 Difference]: With dead ends: 35 [2018-10-22 16:00:47,416 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 16:00:47,417 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-22 16:00:47,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 16:00:47,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 16:00:47,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:00:47,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 16:00:47,422 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-22 16:00:47,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:47,423 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 16:00:47,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:00:47,423 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 16:00:47,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:00:47,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:47,424 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:47,424 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:47,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:47,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-22 16:00:47,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:47,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:47,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:47,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:47,426 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:47,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:47,623 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:47,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,624 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:47,624 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:47,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:47,625 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,625 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 16:00:47,638 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:47,638 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:47,833 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:00:47,833 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:47,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:47,857 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:47,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:48,362 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:48,383 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,383 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 16:00:48,398 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:48,399 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:48,514 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:00:48,515 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:48,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:48,532 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:48,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:48,547 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:48,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:48,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-10-22 16:00:48,551 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:48,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:00:48,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:00:48,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:00:48,552 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-22 16:00:48,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:48,780 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-22 16:00:48,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:00:48,781 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-22 16:00:48,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:48,783 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:00:48,783 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 16:00:48,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-22 16:00:48,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 16:00:48,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-22 16:00:48,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 16:00:48,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 16:00:48,789 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-22 16:00:48,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:48,790 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 16:00:48,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:00:48,790 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 16:00:48,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 16:00:48,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:48,791 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:48,791 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:48,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:48,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-22 16:00:48,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:48,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:48,792 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:48,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:48,793 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:48,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:49,118 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:49,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:49,119 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:49,119 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:49,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:49,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:49,120 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 16:00:49,130 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:49,130 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:49,146 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:49,146 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:49,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:49,167 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:49,168 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:49,588 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:49,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:49,608 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 16:00:49,624 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:49,624 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:49,650 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:49,651 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:49,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:49,685 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:49,686 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:49,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:49,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-10-22 16:00:49,718 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:49,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:00:49,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:00:49,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:00:49,719 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-22 16:00:49,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:49,843 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-22 16:00:49,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 16:00:49,843 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-22 16:00:49,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:49,844 INFO L225 Difference]: With dead ends: 39 [2018-10-22 16:00:49,845 INFO L226 Difference]: Without dead ends: 34 [2018-10-22 16:00:49,846 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:00:49,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-22 16:00:49,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-22 16:00:49,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-22 16:00:49,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-22 16:00:49,852 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-22 16:00:49,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:49,852 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-22 16:00:49,852 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:00:49,852 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-22 16:00:49,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-22 16:00:49,853 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:49,854 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:49,854 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:49,854 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:49,854 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-22 16:00:49,854 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:49,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,855 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:49,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,855 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:49,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:50,170 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:50,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,170 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:50,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:50,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:50,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,171 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 16:00:50,179 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:50,179 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:53,250 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:53,250 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:53,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:53,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:53,927 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:53,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:53,960 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 16:01:53,982 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:53,982 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:54,092 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 16:01:54,092 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:54,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:54,105 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:54,105 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:54,147 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:54,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:54,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-10-22 16:01:54,149 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:54,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 16:01:54,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 16:01:54,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:01:54,150 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-22 16:01:54,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:54,306 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-22 16:01:54,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:01:54,307 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-22 16:01:54,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:54,310 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:01:54,310 INFO L226 Difference]: Without dead ends: 36 [2018-10-22 16:01:54,311 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:01:54,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-22 16:01:54,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-22 16:01:54,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-22 16:01:54,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-22 16:01:54,316 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-22 16:01:54,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:54,317 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-22 16:01:54,317 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 16:01:54,317 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-22 16:01:54,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 16:01:54,318 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:54,318 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:54,318 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:54,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:54,319 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-22 16:01:54,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:54,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:54,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:54,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:54,320 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:54,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:01:54,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:54,571 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:54,571 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:54,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:54,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:54,572 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 16:01:54,580 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:54,580 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:07,056 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:02:07,057 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:07,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:07,085 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:07,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:07,689 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:07,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:07,710 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 16:02:07,727 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:02:07,727 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:02:07,914 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 16:02:07,914 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:07,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:07,941 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:07,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:08,004 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:08,007 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:08,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-10-22 16:02:08,007 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:08,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:02:08,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:02:08,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:02:08,009 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-22 16:02:08,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:08,214 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-22 16:02:08,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:02:08,215 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-22 16:02:08,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:08,216 INFO L225 Difference]: With dead ends: 43 [2018-10-22 16:02:08,216 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 16:02:08,217 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-22 16:02:08,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 16:02:08,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-22 16:02:08,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-22 16:02:08,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-22 16:02:08,222 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-22 16:02:08,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:08,222 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-22 16:02:08,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:02:08,223 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-22 16:02:08,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 16:02:08,223 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:08,224 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:08,224 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:08,224 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:08,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-22 16:02:08,224 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:08,225 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:08,225 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:08,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:08,226 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:08,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:08,937 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:08,937 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:08,937 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:08,938 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:08,938 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:08,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:08,938 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 16:02:08,947 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:08,947 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:08,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:08,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:09,018 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:09,019 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:09,613 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:09,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:09,634 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 16:02:09,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:09,652 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:02:09,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:09,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:09,695 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:09,695 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:09,701 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:09,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:09,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-10-22 16:02:09,703 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:09,703 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:02:09,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:02:09,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:02:09,704 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-22 16:02:09,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:09,877 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-22 16:02:09,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:02:09,878 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-22 16:02:09,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:09,879 INFO L225 Difference]: With dead ends: 45 [2018-10-22 16:02:09,879 INFO L226 Difference]: Without dead ends: 40 [2018-10-22 16:02:09,880 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:02:09,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-22 16:02:09,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-22 16:02:09,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-22 16:02:09,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-22 16:02:09,886 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-22 16:02:09,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:09,886 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-22 16:02:09,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:02:09,886 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-22 16:02:09,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 16:02:09,887 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:09,887 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:09,888 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:09,888 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:09,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-22 16:02:09,888 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:09,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:09,889 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:02:09,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:09,889 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:09,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:10,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:10,203 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:10,203 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:10,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:10,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:10,203 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 16:02:10,213 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:10,213 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:10,228 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:10,228 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:10,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:10,244 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:10,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:10,900 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:10,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:10,923 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 16:02:10,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:02:10,938 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:02:10,971 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:02:10,971 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:10,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:11,011 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:11,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:11,044 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:11,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:11,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-10-22 16:02:11,045 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:11,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:02:11,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:02:11,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:02:11,047 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-22 16:02:11,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:11,249 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-22 16:02:11,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:02:11,250 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-22 16:02:11,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:11,251 INFO L225 Difference]: With dead ends: 47 [2018-10-22 16:02:11,251 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 16:02:11,252 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:02:11,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 16:02:11,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-22 16:02:11,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:02:11,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-22 16:02:11,257 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-22 16:02:11,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:11,257 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-22 16:02:11,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:02:11,258 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-22 16:02:11,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-22 16:02:11,258 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:11,259 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:11,259 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:11,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:11,259 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-22 16:02:11,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:11,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,260 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:11,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:11,261 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:11,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:11,638 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:11,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:11,639 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:11,639 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:11,639 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:11,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:11,639 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 16:02:11,647 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:11,647 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:25,707 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:25,708 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:25,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:25,790 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:25,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:26,541 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:26,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:26,563 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 16:02:26,578 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:02:26,578 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:02:26,799 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:02:26,800 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:26,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:26,843 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:26,843 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:26,850 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:26,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:26,851 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-10-22 16:02:26,851 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:26,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:02:26,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:02:26,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:02:26,853 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-22 16:02:27,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:27,113 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-22 16:02:27,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:02:27,115 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-22 16:02:27,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:27,116 INFO L225 Difference]: With dead ends: 49 [2018-10-22 16:02:27,116 INFO L226 Difference]: Without dead ends: 44 [2018-10-22 16:02:27,116 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-22 16:02:27,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-22 16:02:27,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-22 16:02:27,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-22 16:02:27,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-22 16:02:27,121 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-22 16:02:27,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:27,121 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-22 16:02:27,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:02:27,122 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-22 16:02:27,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-22 16:02:27,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:27,122 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:27,123 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:27,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:27,123 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-22 16:02:27,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:27,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:27,124 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:27,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:27,124 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:27,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:27,412 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:27,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,413 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:27,413 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:27,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:27,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:27,413 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 16:02:27,421 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:27,422 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:27,437 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:27,437 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:27,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:27,467 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:27,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:28,254 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:28,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:28,275 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 16:02:28,291 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:02:28,291 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:02:28,322 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:02:28,323 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:02:28,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:02:28,350 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:28,350 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:02:28,364 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:28,365 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:02:28,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-10-22 16:02:28,366 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:02:28,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:02:28,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:02:28,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:02:28,367 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-22 16:02:28,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:02:28,698 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-22 16:02:28,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:02:28,699 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-22 16:02:28,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:02:28,700 INFO L225 Difference]: With dead ends: 51 [2018-10-22 16:02:28,700 INFO L226 Difference]: Without dead ends: 46 [2018-10-22 16:02:28,701 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 153 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:02:28,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-22 16:02:28,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-22 16:02:28,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-22 16:02:28,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-22 16:02:28,706 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-22 16:02:28,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:02:28,706 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-22 16:02:28,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:02:28,706 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-22 16:02:28,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-22 16:02:28,707 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:02:28,707 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:02:28,707 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:02:28,707 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:02:28,708 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-22 16:02:28,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:02:28,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:02:28,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:02:28,709 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:02:28,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:02:29,073 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:02:29,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:29,074 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:02:29,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:02:29,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:02:29,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:02:29,075 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 16:02:29,083 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:02:29,083 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:06,112 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:05:06,112 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:07,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:07,107 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:07,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:08,210 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:08,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:08,214 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 16:05:08,229 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:05:08,229 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:05:08,461 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 16:05:08,461 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:05:08,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:05:08,495 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:08,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:05:08,551 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:08,553 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:05:08,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-10-22 16:05:08,553 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:05:08,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 16:05:08,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 16:05:08,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:05:08,555 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-22 16:05:09,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:05:09,181 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-22 16:05:09,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:05:09,182 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-22 16:05:09,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:05:09,183 INFO L225 Difference]: With dead ends: 53 [2018-10-22 16:05:09,183 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 16:05:09,184 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 160 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:05:09,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 16:05:09,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-22 16:05:09,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 16:05:09,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-22 16:05:09,188 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-22 16:05:09,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:05:09,189 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-22 16:05:09,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 16:05:09,189 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-22 16:05:09,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:05:09,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:05:09,190 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:05:09,190 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:05:09,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:05:09,190 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-22 16:05:09,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:05:09,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:09,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:05:09,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:05:09,192 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:05:09,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:05:09,947 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:05:09,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:09,948 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:05:09,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:05:09,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:05:09,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:05:09,948 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 16:05:09,958 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:05:09,959 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown