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-new/count_by_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:18:07,694 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:18:07,696 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:18:07,711 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:18:07,712 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:18:07,713 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:18:07,714 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:18:07,717 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:18:07,723 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:18:07,724 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:18:07,728 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:18:07,729 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:18:07,730 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:18:07,732 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:18:07,734 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:18:07,736 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:18:07,737 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:18:07,741 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:18:07,745 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:18:07,746 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:18:07,747 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:18:07,750 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:18:07,756 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:18:07,756 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:18:07,757 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:18:07,757 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:18:07,758 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:18:07,760 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:18:07,761 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:18:07,762 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:18:07,762 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:18:07,765 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:18:07,765 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:18:07,765 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:18:07,766 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:18:07,767 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:18:07,767 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:18:07,798 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:18:07,798 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:18:07,799 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:18:07,799 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:18:07,799 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:18:07,799 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:18:07,800 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:18:07,800 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:18:07,800 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:18:07,800 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:18:07,800 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:18:07,801 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:18:07,804 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:18:07,804 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:18:07,804 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:18:07,804 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:18:07,805 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:18:07,805 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:18:07,805 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:18:07,805 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:18:07,805 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:18:07,805 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:18:07,807 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:18:07,807 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:18:07,807 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:18:07,807 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:18:07,807 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:18:07,808 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:18:07,808 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:18:07,808 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:18:07,808 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:18:07,808 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:18:07,809 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:18:07,809 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:18:07,861 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:18:07,873 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:18:07,877 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:18:07,878 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:18:07,878 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:18:07,879 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-24 12:18:07,933 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c8745428a/267839432a964f62b84fdb710e995104/FLAG3f93cfc0b [2018-10-24 12:18:08,346 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:18:08,347 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-24 12:18:08,357 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c8745428a/267839432a964f62b84fdb710e995104/FLAG3f93cfc0b [2018-10-24 12:18:08,372 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c8745428a/267839432a964f62b84fdb710e995104 [2018-10-24 12:18:08,383 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:18:08,384 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:18:08,385 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:18:08,385 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:18:08,388 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:18:08,389 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,391 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7c5151b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08, skipping insertion in model container [2018-10-24 12:18:08,391 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,402 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:18:08,422 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:18:08,624 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:18:08,629 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:18:08,643 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:18:08,656 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:18:08,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08 WrapperNode [2018-10-24 12:18:08,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:18:08,658 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:18:08,658 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:18:08,658 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:18:08,665 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,669 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,674 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:18:08,675 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:18:08,675 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:18:08,675 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:18:08,682 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,683 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,684 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,686 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,691 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,692 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... [2018-10-24 12:18:08,693 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:18:08,694 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:18:08,694 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:18:08,694 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:18:08,696 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:18:08,758 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:18:08,758 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:18:08,758 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:18:08,759 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:18:08,759 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:18:08,759 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:18:08,759 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:18:08,759 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:18:09,015 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:18:09,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:18:09 BoogieIcfgContainer [2018-10-24 12:18:09,016 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:18:09,016 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:18:09,017 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:18:09,020 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:18:09,020 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:18:08" (1/3) ... [2018-10-24 12:18:09,021 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@296252ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:18:09, skipping insertion in model container [2018-10-24 12:18:09,021 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:18:08" (2/3) ... [2018-10-24 12:18:09,022 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@296252ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:18:09, skipping insertion in model container [2018-10-24 12:18:09,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:18:09" (3/3) ... [2018-10-24 12:18:09,023 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_2_true-unreach-call_true-termination.i [2018-10-24 12:18:09,032 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:18:09,040 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:18:09,055 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:18:09,086 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:18:09,087 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:18:09,087 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:18:09,087 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:18:09,087 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:18:09,087 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:18:09,087 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:18:09,088 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:18:09,106 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-24 12:18:09,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:18:09,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:09,113 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:09,116 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:09,122 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:09,123 INFO L82 PathProgramCache]: Analyzing trace with hash 563245249, now seen corresponding path program 1 times [2018-10-24 12:18:09,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:09,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:09,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:09,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:09,171 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:09,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:09,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:09,225 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:18:09,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:18:09,226 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:18:09,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:18:09,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:18:09,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:18:09,246 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-24 12:18:09,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:09,269 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-10-24 12:18:09,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:18:09,270 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:18:09,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:09,280 INFO L225 Difference]: With dead ends: 32 [2018-10-24 12:18:09,280 INFO L226 Difference]: Without dead ends: 13 [2018-10-24 12:18:09,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:18:09,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-24 12:18:09,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-24 12:18:09,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-24 12:18:09,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-24 12:18:09,324 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-24 12:18:09,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:09,324 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-24 12:18:09,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:18:09,325 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-24 12:18:09,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:18:09,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:09,326 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:09,327 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:09,328 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:09,329 INFO L82 PathProgramCache]: Analyzing trace with hash -496423, now seen corresponding path program 1 times [2018-10-24 12:18:09,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:09,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:09,331 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:09,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:09,332 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:09,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:09,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:09,390 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:18:09,390 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:18:09,391 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:18:09,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:18:09,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:18:09,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:18:09,394 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-24 12:18:09,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:09,465 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:18:09,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:18:09,466 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:18:09,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:09,467 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:18:09,468 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:18:09,469 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:18:09,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:18:09,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-24 12:18:09,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:18:09,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-24 12:18:09,474 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-24 12:18:09,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:09,475 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-24 12:18:09,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:18:09,475 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-24 12:18:09,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:18:09,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:09,476 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:09,476 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:09,476 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:09,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1177044387, now seen corresponding path program 1 times [2018-10-24 12:18:09,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:09,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:09,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:09,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:09,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:09,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:09,589 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:09,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:09,590 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:09,591 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-24 12:18:09,593 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [15], [22], [25], [27], [33], [34], [35], [37] [2018-10-24 12:18:09,643 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:18:09,643 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:18:09,893 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:18:09,897 INFO L272 AbstractInterpreter]: Visited 13 different actions 43 times. Merged at 4 different actions 21 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-24 12:18:09,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:09,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:18:09,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:09,932 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:09,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:09,943 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:09,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:09,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:09,993 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:09,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:10,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:10,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:10,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:18:10,110 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:10,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:18:10,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:18:10,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:18:10,112 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-24 12:18:10,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:10,172 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-24 12:18:10,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:18:10,172 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-24 12:18:10,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:10,174 INFO L225 Difference]: With dead ends: 24 [2018-10-24 12:18:10,174 INFO L226 Difference]: Without dead ends: 19 [2018-10-24 12:18:10,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:18:10,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-24 12:18:10,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-24 12:18:10,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:18:10,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 12:18:10,179 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-24 12:18:10,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:10,180 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 12:18:10,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:18:10,180 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 12:18:10,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:18:10,181 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:10,181 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:10,182 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:10,182 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:10,182 INFO L82 PathProgramCache]: Analyzing trace with hash -489337255, now seen corresponding path program 2 times [2018-10-24 12:18:10,182 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:10,183 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:10,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,184 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:10,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:10,262 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:10,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:10,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:10,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:10,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:10,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:10,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:10,274 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:10,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:10,290 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:18:10,290 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:10,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:10,300 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:10,300 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:10,502 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:10,527 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:10,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:18:10,527 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:10,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:18:10,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:18:10,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:18:10,529 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 5 states. [2018-10-24 12:18:10,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:10,702 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:18:10,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:18:10,704 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-24 12:18:10,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:10,705 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:18:10,705 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:18:10,705 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:18:10,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:18:10,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-24 12:18:10,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-24 12:18:10,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-24 12:18:10,713 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-24 12:18:10,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:10,713 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-24 12:18:10,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:18:10,714 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-24 12:18:10,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-24 12:18:10,717 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:10,717 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:10,717 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:10,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:10,718 INFO L82 PathProgramCache]: Analyzing trace with hash -169763, now seen corresponding path program 3 times [2018-10-24 12:18:10,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:10,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:10,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:10,721 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:10,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:10,820 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:10,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:10,821 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:10,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:10,821 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:10,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:10,822 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:10,830 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:10,830 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:10,840 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:10,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:10,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:10,852 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:10,852 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:10,987 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:11,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:11,008 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:18:11,008 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:11,009 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:18:11,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:18:11,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:18:11,010 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 6 states. [2018-10-24 12:18:11,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:11,046 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-24 12:18:11,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:18:11,050 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-24 12:18:11,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:11,051 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:18:11,051 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:18:11,052 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:18:11,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:18:11,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-24 12:18:11,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:18:11,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 12:18:11,057 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-24 12:18:11,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:11,057 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 12:18:11,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:18:11,058 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 12:18:11,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:18:11,058 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:11,059 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:11,059 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:11,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:11,059 INFO L82 PathProgramCache]: Analyzing trace with hash -35450919, now seen corresponding path program 4 times [2018-10-24 12:18:11,060 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:11,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:11,061 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:11,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:11,061 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:11,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:11,254 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:11,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,255 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:11,255 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:11,256 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:11,256 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,256 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:11,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:11,272 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:11,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:11,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:11,302 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:11,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:11,444 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:11,466 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:11,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:18:11,466 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:11,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:18:11,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:18:11,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:18:11,468 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-10-24 12:18:11,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:11,682 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:18:11,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:18:11,683 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-24 12:18:11,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:11,684 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:18:11,684 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 12:18:11,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:18:11,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 12:18:11,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-24 12:18:11,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:18:11,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-24 12:18:11,692 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-24 12:18:11,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:11,693 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-24 12:18:11,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:18:11,693 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-24 12:18:11,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:18:11,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:11,697 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:11,697 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:11,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:11,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1170618205, now seen corresponding path program 5 times [2018-10-24 12:18:11,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:11,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:11,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:11,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:11,701 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:11,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:11,964 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:11,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,964 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:11,964 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:11,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:11,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:11,965 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:11,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:11,973 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:11,984 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:18:11,984 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:11,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:11,996 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:11,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:12,129 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:12,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:18:12,161 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:12,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:18:12,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:18:12,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:18:12,163 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-10-24 12:18:12,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:12,203 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-24 12:18:12,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:18:12,205 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-24 12:18:12,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:12,206 INFO L225 Difference]: With dead ends: 36 [2018-10-24 12:18:12,206 INFO L226 Difference]: Without dead ends: 31 [2018-10-24 12:18:12,207 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:18:12,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-24 12:18:12,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-24 12:18:12,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:18:12,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 12:18:12,212 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-24 12:18:12,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:12,212 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 12:18:12,212 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:18:12,212 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 12:18:12,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:18:12,213 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:12,213 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:12,214 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:12,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:12,214 INFO L82 PathProgramCache]: Analyzing trace with hash -520507047, now seen corresponding path program 6 times [2018-10-24 12:18:12,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:12,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,215 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:12,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:12,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:12,336 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:12,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:12,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:12,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:12,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:12,338 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:12,346 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:12,346 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:12,354 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:12,354 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:12,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:12,365 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:12,583 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:12,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:18:12,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:12,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:18:12,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:18:12,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:18:12,606 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-24 12:18:12,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:12,675 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:18:12,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:18:12,677 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-24 12:18:12,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:12,678 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:18:12,678 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:18:12,679 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:18:12,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:18:12,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-24 12:18:12,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:18:12,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-24 12:18:12,684 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-24 12:18:12,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:12,684 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-24 12:18:12,685 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:18:12,685 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-24 12:18:12,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-24 12:18:12,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:12,686 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:12,686 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:12,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:12,687 INFO L82 PathProgramCache]: Analyzing trace with hash -866507299, now seen corresponding path program 7 times [2018-10-24 12:18:12,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:12,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,688 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:12,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:12,688 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:12,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:12,871 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:12,871 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:12,872 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:12,872 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:12,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:12,872 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:12,883 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:12,883 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:12,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:12,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:12,902 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:12,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:13,114 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,135 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:13,135 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:18:13,135 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:13,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:18:13,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:18:13,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:18:13,137 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-24 12:18:13,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:13,183 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-24 12:18:13,185 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:18:13,185 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-24 12:18:13,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:13,186 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:18:13,187 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:18:13,187 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:18:13,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:18:13,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-24 12:18:13,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:18:13,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 12:18:13,192 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-24 12:18:13,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:13,192 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 12:18:13,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:18:13,193 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 12:18:13,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:18:13,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:13,194 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:13,194 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:13,194 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:13,194 INFO L82 PathProgramCache]: Analyzing trace with hash -638504231, now seen corresponding path program 8 times [2018-10-24 12:18:13,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:13,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:13,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:13,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:13,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:13,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:13,374 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,375 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:13,375 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:13,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:13,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:13,386 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:13,386 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:13,398 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:18:13,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:13,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:13,411 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:13,639 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:13,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:18:13,666 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:13,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:18:13,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:18:13,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:18:13,668 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-24 12:18:13,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:13,829 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:18:13,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:18:13,832 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-24 12:18:13,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:13,833 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:18:13,834 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:18:13,834 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:18:13,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:18:13,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-24 12:18:13,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:18:13,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-24 12:18:13,839 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-24 12:18:13,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:13,840 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-24 12:18:13,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:18:13,840 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-24 12:18:13,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-24 12:18:13,841 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:13,841 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:13,841 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:13,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:13,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1457599581, now seen corresponding path program 9 times [2018-10-24 12:18:13,842 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:13,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:13,843 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:13,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:13,843 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:13,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:13,961 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,961 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,961 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:13,961 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:13,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:13,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:13,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:13,970 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:13,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:13,980 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:13,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:13,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:13,993 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:13,994 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:14,257 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:14,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:18:14,278 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:14,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:18:14,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:18:14,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:18:14,280 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-24 12:18:14,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:14,319 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-24 12:18:14,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:18:14,320 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-24 12:18:14,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:14,321 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:18:14,322 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:18:14,323 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:18:14,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:18:14,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-24 12:18:14,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:18:14,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 12:18:14,328 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-24 12:18:14,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:14,328 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 12:18:14,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:18:14,329 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 12:18:14,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:18:14,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:14,330 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:14,330 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:14,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:14,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1956746329, now seen corresponding path program 10 times [2018-10-24 12:18:14,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:14,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:14,332 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:14,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:14,332 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:14,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:14,515 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:14,516 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:14,516 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:14,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:14,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:14,516 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:14,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:14,526 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:14,537 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:14,554 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:14,957 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:14,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:14,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:18:14,979 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:14,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:18:14,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:18:14,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:18:14,980 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-24 12:18:15,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:15,044 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:18:15,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:18:15,048 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-24 12:18:15,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:15,050 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:18:15,050 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 12:18:15,051 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:18:15,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 12:18:15,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-24 12:18:15,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-24 12:18:15,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-24 12:18:15,055 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-24 12:18:15,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:15,055 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-24 12:18:15,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:18:15,055 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-24 12:18:15,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:18:15,056 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:15,056 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:15,057 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:15,057 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:15,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1434230051, now seen corresponding path program 11 times [2018-10-24 12:18:15,057 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:15,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:15,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:15,058 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:15,058 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:15,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:15,363 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:15,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:15,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:15,364 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:15,364 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:15,364 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:15,364 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:15,372 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:15,372 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:15,388 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:18:15,388 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:15,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:15,404 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:15,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:15,703 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:15,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:15,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:18:15,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:15,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:18:15,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:18:15,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:18:15,732 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-24 12:18:15,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:15,833 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-24 12:18:15,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:18:15,834 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-24 12:18:15,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:15,835 INFO L225 Difference]: With dead ends: 54 [2018-10-24 12:18:15,835 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:18:15,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:18:15,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:18:15,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-24 12:18:15,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:18:15,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 12:18:15,841 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-24 12:18:15,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:15,841 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 12:18:15,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:18:15,842 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 12:18:15,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:18:15,843 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:15,843 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:15,843 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:15,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:15,843 INFO L82 PathProgramCache]: Analyzing trace with hash -85797415, now seen corresponding path program 12 times [2018-10-24 12:18:15,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:15,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:15,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:15,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:15,845 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:15,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:16,017 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:16,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:16,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:16,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:16,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:16,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:16,028 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:16,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:16,055 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:16,055 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:16,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:16,069 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,070 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:16,380 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,401 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:16,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:18:16,401 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:16,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:18:16,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:18:16,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:18:16,402 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-24 12:18:16,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:16,444 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:18:16,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:18:16,445 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-24 12:18:16,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:16,445 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:18:16,446 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:18:16,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:18:16,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:18:16,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-24 12:18:16,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-24 12:18:16,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-24 12:18:16,451 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-24 12:18:16,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:16,451 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-24 12:18:16,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:18:16,451 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-24 12:18:16,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-24 12:18:16,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:16,453 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:16,453 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:16,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:16,453 INFO L82 PathProgramCache]: Analyzing trace with hash 241742173, now seen corresponding path program 13 times [2018-10-24 12:18:16,453 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:16,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:16,454 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:16,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:16,455 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:16,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:16,618 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:16,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:16,619 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:16,619 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:16,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:16,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:16,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:16,628 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:16,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:16,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:16,659 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:16,659 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:17,443 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:17,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:17,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:18:17,465 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:17,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:18:17,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:18:17,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:18:17,467 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-24 12:18:17,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:17,519 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-24 12:18:17,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:18:17,520 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-24 12:18:17,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:17,521 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:18:17,522 INFO L226 Difference]: Without dead ends: 55 [2018-10-24 12:18:17,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:18:17,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-24 12:18:17,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-24 12:18:17,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:18:17,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 12:18:17,527 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-24 12:18:17,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:17,527 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 12:18:17,527 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:18:17,527 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 12:18:17,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:18:17,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:17,528 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:17,529 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:17,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:17,529 INFO L82 PathProgramCache]: Analyzing trace with hash -192088231, now seen corresponding path program 14 times [2018-10-24 12:18:17,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:17,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:17,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:17,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:17,530 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:17,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:17,705 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:17,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:17,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:17,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:17,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:17,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:17,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:17,713 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:17,713 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:17,729 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:18:17,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:17,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:17,739 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:17,740 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:18,201 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:18,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:18,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:18:18,224 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:18,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:18:18,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:18:18,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:18:18,225 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-24 12:18:18,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:18,300 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:18:18,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:18:18,301 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-24 12:18:18,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:18,301 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:18:18,302 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:18:18,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:18:18,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:18:18,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-24 12:18:18,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:18:18,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-24 12:18:18,308 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-24 12:18:18,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:18,308 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-24 12:18:18,308 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:18:18,309 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-24 12:18:18,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:18:18,309 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:18,310 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:18,310 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:18,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:18,310 INFO L82 PathProgramCache]: Analyzing trace with hash -877060131, now seen corresponding path program 15 times [2018-10-24 12:18:18,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:18,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:18,311 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:18,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:18,311 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:18,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:18,587 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:18,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:18,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:18,588 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:18,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:18,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:18,588 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:18,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:18,596 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:18,606 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:18,607 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:18,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:18,618 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:18,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:19,155 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:19,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:19,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:18:19,177 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:19,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:18:19,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:18:19,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:18:19,178 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-24 12:18:19,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:19,232 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-24 12:18:19,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:18:19,232 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-24 12:18:19,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:19,233 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:18:19,233 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:18:19,234 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:18:19,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:18:19,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-24 12:18:19,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:18:19,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-24 12:18:19,238 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-24 12:18:19,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:19,238 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-24 12:18:19,238 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:18:19,238 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-24 12:18:19,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:18:19,239 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:19,239 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:19,239 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:19,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:19,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1485309735, now seen corresponding path program 16 times [2018-10-24 12:18:19,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:19,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:19,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:19,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:19,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:19,814 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:19,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:19,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:19,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:19,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:19,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:19,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:19,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:19,823 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:19,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:19,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:19,861 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:19,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:20,624 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:20,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:20,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:18:20,645 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:20,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:18:20,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:18:20,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:18:20,646 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-24 12:18:20,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:20,701 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:18:20,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:18:20,702 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-24 12:18:20,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:20,703 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:18:20,703 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:18:20,704 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:18:20,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:18:20,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-24 12:18:20,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-24 12:18:20,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-24 12:18:20,709 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-24 12:18:20,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:20,709 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-24 12:18:20,709 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:18:20,709 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-24 12:18:20,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-24 12:18:20,710 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:20,710 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:20,711 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:20,711 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:20,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1382240675, now seen corresponding path program 17 times [2018-10-24 12:18:20,711 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:20,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:20,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:20,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:20,712 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:20,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:20,939 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:20,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:20,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:20,940 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:20,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:20,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:20,941 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:20,955 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:20,955 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:20,972 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:18:20,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:20,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:20,987 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:20,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:21,947 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:21,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:21,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:18:21,967 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:21,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:18:21,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:18:21,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:21,969 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-24 12:18:22,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:22,063 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-24 12:18:22,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:18:22,063 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-24 12:18:22,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:22,064 INFO L225 Difference]: With dead ends: 72 [2018-10-24 12:18:22,064 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:18:22,065 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:18:22,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:18:22,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-24 12:18:22,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:18:22,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-24 12:18:22,071 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-24 12:18:22,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:22,072 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-24 12:18:22,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:18:22,072 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-24 12:18:22,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:18:22,073 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:22,073 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:22,073 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:22,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:22,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1753490855, now seen corresponding path program 18 times [2018-10-24 12:18:22,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:22,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:22,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:22,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:22,077 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:22,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:22,898 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:22,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:22,899 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:22,899 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:22,899 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:22,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:22,899 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:22,908 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:22,908 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:22,921 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:22,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:22,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:22,935 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:22,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:23,398 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:23,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:23,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:18:23,419 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:23,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:18:23,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:18:23,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:18:23,420 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-24 12:18:23,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:23,486 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:18:23,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:18:23,486 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-24 12:18:23,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:23,487 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:18:23,487 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:18:23,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:18:23,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:18:23,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-24 12:18:23,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:18:23,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-24 12:18:23,492 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-24 12:18:23,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:23,493 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-24 12:18:23,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:18:23,493 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-24 12:18:23,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-24 12:18:23,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:23,494 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:23,494 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:23,494 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:23,495 INFO L82 PathProgramCache]: Analyzing trace with hash -2126816035, now seen corresponding path program 19 times [2018-10-24 12:18:23,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:23,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:23,495 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:23,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:23,496 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:23,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:23,728 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:23,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:23,728 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:23,728 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:23,728 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:23,728 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:23,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:23,736 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:23,736 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:23,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:23,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:23,774 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:23,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:24,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:24,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:18:24,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:24,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:18:24,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:18:24,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:18:24,370 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-24 12:18:24,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:24,466 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-24 12:18:24,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:18:24,467 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-24 12:18:24,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:24,468 INFO L225 Difference]: With dead ends: 78 [2018-10-24 12:18:24,468 INFO L226 Difference]: Without dead ends: 73 [2018-10-24 12:18:24,469 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:18:24,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-24 12:18:24,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-24 12:18:24,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:18:24,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-24 12:18:24,472 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-24 12:18:24,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:24,472 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-24 12:18:24,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:18:24,472 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-24 12:18:24,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:18:24,473 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:24,473 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:24,473 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:24,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:24,474 INFO L82 PathProgramCache]: Analyzing trace with hash 108043225, now seen corresponding path program 20 times [2018-10-24 12:18:24,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:24,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:24,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:24,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:24,475 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:24,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:24,743 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:24,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:24,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:24,744 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:24,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:24,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:24,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:24,752 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:24,752 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:24,776 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:18:24,777 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:24,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:24,788 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:24,788 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:25,326 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:25,346 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:25,346 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:18:25,347 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:25,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:18:25,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:18:25,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:18:25,348 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-10-24 12:18:25,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:25,488 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:18:25,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:18:25,492 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-24 12:18:25,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:25,493 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:18:25,493 INFO L226 Difference]: Without dead ends: 76 [2018-10-24 12:18:25,494 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:18:25,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-24 12:18:25,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-24 12:18:25,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-24 12:18:25,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-24 12:18:25,496 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-24 12:18:25,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:25,497 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-24 12:18:25,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:18:25,497 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-24 12:18:25,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:18:25,498 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:25,498 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:25,498 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:25,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:25,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1782764707, now seen corresponding path program 21 times [2018-10-24 12:18:25,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:25,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:25,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:25,499 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:25,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:25,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:25,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:25,866 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:25,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:25,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:25,867 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:25,874 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:25,874 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:25,889 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:25,889 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:25,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:25,904 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:25,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:26,513 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:26,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:26,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-24 12:18:26,534 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:26,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:18:26,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:18:26,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:18:26,536 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 24 states. [2018-10-24 12:18:26,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:26,754 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-24 12:18:26,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:18:26,754 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-24 12:18:26,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:26,756 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:18:26,756 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:18:26,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:18:26,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:18:26,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-24 12:18:26,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:18:26,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-24 12:18:26,761 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-24 12:18:26,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:26,761 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-24 12:18:26,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:18:26,762 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-24 12:18:26,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-24 12:18:26,763 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:26,763 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:26,763 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:26,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:26,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1949187417, now seen corresponding path program 22 times [2018-10-24 12:18:26,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:26,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:26,765 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:26,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:26,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:26,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:27,490 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:27,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:27,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:27,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:27,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:27,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:27,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:27,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:27,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:27,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:27,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:27,544 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:27,545 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:28,199 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:28,219 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:28,219 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-24 12:18:28,219 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:28,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:18:28,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:18:28,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:18:28,220 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 25 states. [2018-10-24 12:18:28,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:28,311 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-24 12:18:28,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:18:28,317 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-24 12:18:28,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:28,318 INFO L225 Difference]: With dead ends: 87 [2018-10-24 12:18:28,318 INFO L226 Difference]: Without dead ends: 82 [2018-10-24 12:18:28,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:18:28,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-24 12:18:28,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-24 12:18:28,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-24 12:18:28,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-24 12:18:28,322 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-24 12:18:28,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:28,322 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-24 12:18:28,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:18:28,323 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-24 12:18:28,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-24 12:18:28,323 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:28,324 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:28,324 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:28,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:28,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1011489245, now seen corresponding path program 23 times [2018-10-24 12:18:28,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:28,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:28,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:28,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:28,325 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:28,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:29,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:29,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:29,181 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:29,181 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:29,181 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:29,181 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:29,188 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:29,188 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:29,210 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:18:29,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:29,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:29,223 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:29,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:29,918 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:29,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:29,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-24 12:18:29,939 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:29,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:18:29,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:18:29,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:18:29,941 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 26 states. [2018-10-24 12:18:30,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:30,022 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-24 12:18:30,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:18:30,023 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-10-24 12:18:30,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:30,024 INFO L225 Difference]: With dead ends: 90 [2018-10-24 12:18:30,024 INFO L226 Difference]: Without dead ends: 85 [2018-10-24 12:18:30,025 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:18:30,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-24 12:18:30,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-24 12:18:30,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-24 12:18:30,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-24 12:18:30,029 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-24 12:18:30,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:30,029 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-24 12:18:30,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:18:30,029 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-24 12:18:30,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-24 12:18:30,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:30,030 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:30,031 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:30,031 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:30,031 INFO L82 PathProgramCache]: Analyzing trace with hash 512540377, now seen corresponding path program 24 times [2018-10-24 12:18:30,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:30,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:30,032 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:30,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:30,032 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:30,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:30,430 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:30,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:30,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:30,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:30,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:30,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:30,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:30,438 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:30,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:30,477 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:30,477 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:30,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:30,492 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:30,493 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:31,256 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:31,277 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:31,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-24 12:18:31,277 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:31,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:18:31,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:18:31,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:18:31,279 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 27 states. [2018-10-24 12:18:31,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:31,365 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-24 12:18:31,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:18:31,366 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-24 12:18:31,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:31,367 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:18:31,367 INFO L226 Difference]: Without dead ends: 88 [2018-10-24 12:18:31,369 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:18:31,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-24 12:18:31,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-24 12:18:31,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:18:31,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-24 12:18:31,372 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-24 12:18:31,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:31,372 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-24 12:18:31,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:18:31,372 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-24 12:18:31,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-24 12:18:31,373 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:31,373 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:31,373 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:31,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:31,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1208625245, now seen corresponding path program 25 times [2018-10-24 12:18:31,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:31,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:31,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:31,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:31,375 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:31,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:31,750 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:31,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:31,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:31,751 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:31,751 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:31,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:31,751 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:31,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:31,759 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:31,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:31,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:31,789 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:31,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:33,972 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:33,993 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:33,993 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-24 12:18:33,993 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:33,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:18:33,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:18:33,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:18:33,995 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 28 states. [2018-10-24 12:18:34,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:34,075 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-24 12:18:34,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:18:34,076 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-10-24 12:18:34,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:34,077 INFO L225 Difference]: With dead ends: 96 [2018-10-24 12:18:34,077 INFO L226 Difference]: Without dead ends: 91 [2018-10-24 12:18:34,080 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:18:34,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-24 12:18:34,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-24 12:18:34,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-24 12:18:34,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-24 12:18:34,083 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-24 12:18:34,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:34,083 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-24 12:18:34,083 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:18:34,084 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-24 12:18:34,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-24 12:18:34,084 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:34,084 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:34,085 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:34,085 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:34,085 INFO L82 PathProgramCache]: Analyzing trace with hash -2124144551, now seen corresponding path program 26 times [2018-10-24 12:18:34,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:34,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:34,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:34,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:34,086 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:34,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:34,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:34,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:34,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:34,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:34,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:34,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:34,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:34,478 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:34,478 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:34,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:18:34,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:34,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:34,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:34,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:35,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:35,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:35,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:18:35,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:35,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:18:35,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:18:35,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:18:35,374 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 29 states. [2018-10-24 12:18:35,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:35,458 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-24 12:18:35,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:18:35,460 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 89 [2018-10-24 12:18:35,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:35,461 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:18:35,461 INFO L226 Difference]: Without dead ends: 94 [2018-10-24 12:18:35,462 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:18:35,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-24 12:18:35,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-24 12:18:35,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-24 12:18:35,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-24 12:18:35,465 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-24 12:18:35,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:35,466 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-24 12:18:35,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:18:35,466 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-24 12:18:35,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-24 12:18:35,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:35,466 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:35,467 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:35,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:35,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1910155555, now seen corresponding path program 27 times [2018-10-24 12:18:35,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:35,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:35,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:35,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:35,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:35,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:36,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:36,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:36,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:36,145 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:36,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:36,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:36,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:36,153 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:36,154 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:36,168 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:36,168 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:36,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:36,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:36,186 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:37,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:37,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:37,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-24 12:18:37,146 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:37,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:18:37,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:18:37,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:18:37,148 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 30 states. [2018-10-24 12:18:37,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:37,256 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-24 12:18:37,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:18:37,257 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-10-24 12:18:37,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:37,258 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:18:37,258 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:18:37,258 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:18:37,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:18:37,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-24 12:18:37,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-24 12:18:37,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-24 12:18:37,262 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-24 12:18:37,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:37,263 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-24 12:18:37,263 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:18:37,263 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-24 12:18:37,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:18:37,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:37,264 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:37,264 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:37,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:37,264 INFO L82 PathProgramCache]: Analyzing trace with hash -695442983, now seen corresponding path program 28 times [2018-10-24 12:18:37,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:37,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:37,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:37,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:37,265 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:37,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:38,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:38,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:38,130 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:38,130 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:38,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:38,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:38,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:38,138 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:38,138 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:38,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:38,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:38,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:38,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:39,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:39,211 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:39,211 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-24 12:18:39,211 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:39,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:18:39,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:18:39,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:18:39,213 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 31 states. [2018-10-24 12:18:39,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:39,341 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-24 12:18:39,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:18:39,341 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 95 [2018-10-24 12:18:39,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:39,343 INFO L225 Difference]: With dead ends: 105 [2018-10-24 12:18:39,343 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:18:39,345 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:18:39,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:18:39,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-24 12:18:39,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:18:39,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-24 12:18:39,348 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-24 12:18:39,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:39,348 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-24 12:18:39,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:18:39,348 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-24 12:18:39,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-24 12:18:39,348 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:39,349 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:39,349 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:39,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:39,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1707320669, now seen corresponding path program 29 times [2018-10-24 12:18:39,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:39,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:39,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:39,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:39,350 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:39,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:40,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:40,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:40,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:40,443 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:40,443 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:40,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:40,443 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:40,456 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:40,457 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:40,482 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:18:40,482 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:40,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:40,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:40,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:41,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:41,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:41,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-24 12:18:41,618 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:41,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:18:41,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:18:41,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:18:41,619 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 32 states. [2018-10-24 12:18:41,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:41,866 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-24 12:18:41,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:18:41,866 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 98 [2018-10-24 12:18:41,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:41,867 INFO L225 Difference]: With dead ends: 108 [2018-10-24 12:18:41,868 INFO L226 Difference]: Without dead ends: 103 [2018-10-24 12:18:41,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:18:41,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-24 12:18:41,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-24 12:18:41,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-24 12:18:41,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-24 12:18:41,872 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-24 12:18:41,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:41,873 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-24 12:18:41,873 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:18:41,873 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-24 12:18:41,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 12:18:41,873 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:41,874 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:41,874 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:41,874 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:41,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1780645031, now seen corresponding path program 30 times [2018-10-24 12:18:41,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:41,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:41,875 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:41,875 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:41,875 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:41,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:42,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:42,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:42,714 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:42,715 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:42,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:42,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:42,715 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:42,723 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:42,723 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:42,740 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:42,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:42,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:42,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:42,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:43,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:43,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:43,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-24 12:18:43,879 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:43,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:18:43,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:18:43,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:18:43,880 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 33 states. [2018-10-24 12:18:44,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:44,001 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-24 12:18:44,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:18:44,002 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 101 [2018-10-24 12:18:44,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:44,003 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:18:44,004 INFO L226 Difference]: Without dead ends: 106 [2018-10-24 12:18:44,005 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:18:44,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-24 12:18:44,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-24 12:18:44,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-24 12:18:44,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-24 12:18:44,009 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-24 12:18:44,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:44,009 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-24 12:18:44,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:18:44,009 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-24 12:18:44,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:18:44,010 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:44,010 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:44,010 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:44,011 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:44,011 INFO L82 PathProgramCache]: Analyzing trace with hash 671945693, now seen corresponding path program 31 times [2018-10-24 12:18:44,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:44,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:44,011 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:44,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:44,012 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:44,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:44,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:44,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:44,474 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:44,474 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:44,474 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:44,474 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:44,475 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:44,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:44,483 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:44,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:44,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:44,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:44,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:45,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:45,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:45,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-24 12:18:45,665 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:45,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:18:45,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:18:45,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:18:45,667 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 34 states. [2018-10-24 12:18:45,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:45,802 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-24 12:18:45,803 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:18:45,803 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 104 [2018-10-24 12:18:45,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:45,804 INFO L225 Difference]: With dead ends: 114 [2018-10-24 12:18:45,804 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:18:45,806 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:18:45,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:18:45,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-24 12:18:45,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-24 12:18:45,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-24 12:18:45,809 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-24 12:18:45,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:45,810 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-24 12:18:45,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:18:45,810 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-24 12:18:45,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-24 12:18:45,811 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:45,811 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:45,811 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:45,811 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:45,811 INFO L82 PathProgramCache]: Analyzing trace with hash -181435175, now seen corresponding path program 32 times [2018-10-24 12:18:45,811 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:45,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:45,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:45,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:45,812 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:45,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:46,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:46,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:46,356 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:46,357 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:46,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:46,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:46,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:46,365 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:46,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:46,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:18:46,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:46,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:46,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:46,413 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:47,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:47,914 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:47,914 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-24 12:18:47,914 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:47,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:18:47,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:18:47,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:18:47,916 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 35 states. [2018-10-24 12:18:48,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:48,064 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-24 12:18:48,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:18:48,065 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 107 [2018-10-24 12:18:48,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:48,066 INFO L225 Difference]: With dead ends: 117 [2018-10-24 12:18:48,066 INFO L226 Difference]: Without dead ends: 112 [2018-10-24 12:18:48,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:18:48,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-24 12:18:48,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-24 12:18:48,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-24 12:18:48,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-24 12:18:48,070 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-24 12:18:48,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:48,071 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-24 12:18:48,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:18:48,071 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-24 12:18:48,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-24 12:18:48,071 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:48,072 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:48,072 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:48,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:48,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1339448739, now seen corresponding path program 33 times [2018-10-24 12:18:48,072 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:48,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:48,073 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:48,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:48,073 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:48,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:48,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:48,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:48,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:48,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:48,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:48,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:48,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:48,768 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:48,768 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:48,788 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:48,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:48,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:48,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:48,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:50,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:50,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:50,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-24 12:18:50,119 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:50,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:18:50,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:18:50,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:18:50,121 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 36 states. [2018-10-24 12:18:50,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:50,268 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-24 12:18:50,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:18:50,268 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 110 [2018-10-24 12:18:50,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:50,270 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:18:50,270 INFO L226 Difference]: Without dead ends: 115 [2018-10-24 12:18:50,270 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 187 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:18:50,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-24 12:18:50,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-24 12:18:50,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-24 12:18:50,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-24 12:18:50,274 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-24 12:18:50,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:50,274 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-24 12:18:50,274 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:18:50,275 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-24 12:18:50,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-24 12:18:50,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:50,275 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:50,276 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:50,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:50,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1750754905, now seen corresponding path program 34 times [2018-10-24 12:18:50,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:50,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:50,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:50,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:50,277 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:50,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:51,185 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:51,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:51,185 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:51,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:51,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:51,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:51,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:51,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:51,193 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:51,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:51,216 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:51,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:51,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:52,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:52,574 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:52,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-24 12:18:52,574 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:52,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:18:52,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:18:52,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:18:52,575 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 37 states. [2018-10-24 12:18:52,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:52,740 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-24 12:18:52,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:18:52,740 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 113 [2018-10-24 12:18:52,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:52,741 INFO L225 Difference]: With dead ends: 123 [2018-10-24 12:18:52,741 INFO L226 Difference]: Without dead ends: 118 [2018-10-24 12:18:52,742 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-24 12:18:52,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-24 12:18:52,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-24 12:18:52,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-24 12:18:52,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-24 12:18:52,745 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-24 12:18:52,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:52,745 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-24 12:18:52,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:18:52,746 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-24 12:18:52,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:18:52,746 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:52,746 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:52,747 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:52,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:52,747 INFO L82 PathProgramCache]: Analyzing trace with hash -616476451, now seen corresponding path program 35 times [2018-10-24 12:18:52,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:52,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:52,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:52,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:52,748 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:52,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:53,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:53,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:53,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:53,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:53,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:53,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:53,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:53,344 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:18:53,344 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:18:53,378 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:18:53,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:53,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:53,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:53,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:54,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:54,833 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:54,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-24 12:18:54,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:54,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:18:54,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:18:54,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:18:54,835 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 38 states. [2018-10-24 12:18:54,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:54,966 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-24 12:18:54,966 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:18:54,967 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 116 [2018-10-24 12:18:54,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:54,968 INFO L225 Difference]: With dead ends: 126 [2018-10-24 12:18:54,968 INFO L226 Difference]: Without dead ends: 121 [2018-10-24 12:18:54,968 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:18:54,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-24 12:18:54,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-24 12:18:54,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-24 12:18:54,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-24 12:18:54,972 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-24 12:18:54,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:54,972 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-24 12:18:54,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:18:54,973 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-24 12:18:54,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-24 12:18:54,973 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:54,973 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:54,974 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:54,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:54,974 INFO L82 PathProgramCache]: Analyzing trace with hash 557197273, now seen corresponding path program 36 times [2018-10-24 12:18:54,974 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:54,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:54,978 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:54,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:54,978 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:54,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:56,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:56,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:56,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:56,091 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:56,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:56,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:56,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:56,099 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:18:56,100 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:18:56,120 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:18:56,120 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:18:56,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:56,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:56,145 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:18:58,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:58,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:18:58,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-24 12:18:58,272 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:18:58,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:18:58,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:18:58,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:18:58,274 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 39 states. [2018-10-24 12:18:58,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:18:58,419 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-24 12:18:58,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:18:58,419 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-24 12:18:58,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:18:58,420 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:18:58,420 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:18:58,421 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:18:58,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:18:58,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-24 12:18:58,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-24 12:18:58,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-24 12:18:58,424 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-24 12:18:58,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:18:58,425 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-24 12:18:58,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:18:58,425 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-24 12:18:58,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-24 12:18:58,426 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:18:58,426 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:18:58,426 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:18:58,426 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:18:58,426 INFO L82 PathProgramCache]: Analyzing trace with hash 142352221, now seen corresponding path program 37 times [2018-10-24 12:18:58,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:18:58,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:58,427 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:18:58,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:18:58,427 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:18:58,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:59,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:59,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:59,688 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:18:59,689 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:18:59,689 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:18:59,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:18:59,689 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:18:59,696 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:18:59,697 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:18:59,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:18:59,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:18:59,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:18:59,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:01,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:01,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:01,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-24 12:19:01,488 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:01,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:19:01,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:19:01,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:19:01,490 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 40 states. [2018-10-24 12:19:01,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:01,646 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-24 12:19:01,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:19:01,648 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-24 12:19:01,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:01,649 INFO L225 Difference]: With dead ends: 132 [2018-10-24 12:19:01,649 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:19:01,650 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-24 12:19:01,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:19:01,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-24 12:19:01,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-24 12:19:01,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-24 12:19:01,653 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-24 12:19:01,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:01,654 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-24 12:19:01,654 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:19:01,654 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-24 12:19:01,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:19:01,655 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:01,655 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:01,655 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:01,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:01,656 INFO L82 PathProgramCache]: Analyzing trace with hash -1885681319, now seen corresponding path program 38 times [2018-10-24 12:19:01,656 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:01,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:01,656 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:01,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:01,657 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:01,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:02,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:02,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:02,268 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:02,268 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:02,268 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:02,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:02,268 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:02,277 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:02,277 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:02,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-24 12:19:02,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:02,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:02,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:02,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:04,401 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:04,421 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:04,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-24 12:19:04,421 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:04,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:19:04,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:19:04,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:19:04,422 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 41 states. [2018-10-24 12:19:04,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:04,552 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-24 12:19:04,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:19:04,552 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 125 [2018-10-24 12:19:04,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:04,554 INFO L225 Difference]: With dead ends: 135 [2018-10-24 12:19:04,554 INFO L226 Difference]: Without dead ends: 130 [2018-10-24 12:19:04,555 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:19:04,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-24 12:19:04,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-24 12:19:04,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:19:04,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-24 12:19:04,559 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-24 12:19:04,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:04,559 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-24 12:19:04,559 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:19:04,560 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-24 12:19:04,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-24 12:19:04,560 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:04,560 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:04,561 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:04,561 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:04,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1727918627, now seen corresponding path program 39 times [2018-10-24 12:19:04,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:04,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:04,562 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:04,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:04,562 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:04,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:05,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:05,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:05,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:05,293 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:05,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:05,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:05,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:05,300 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:05,301 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:05,319 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:05,319 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:05,322 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:05,339 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:05,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:07,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:07,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:07,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-24 12:19:07,128 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:07,129 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:19:07,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:19:07,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:19:07,130 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 42 states. [2018-10-24 12:19:07,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:07,589 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-24 12:19:07,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:19:07,592 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 128 [2018-10-24 12:19:07,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:07,593 INFO L225 Difference]: With dead ends: 138 [2018-10-24 12:19:07,593 INFO L226 Difference]: Without dead ends: 133 [2018-10-24 12:19:07,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:19:07,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-24 12:19:07,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-24 12:19:07,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-24 12:19:07,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-24 12:19:07,598 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-24 12:19:07,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:07,598 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-24 12:19:07,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:19:07,598 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-24 12:19:07,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-24 12:19:07,599 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:07,599 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:07,600 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:07,600 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:07,600 INFO L82 PathProgramCache]: Analyzing trace with hash -513783079, now seen corresponding path program 40 times [2018-10-24 12:19:07,600 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:07,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:07,601 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:07,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:07,601 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:07,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:08,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:08,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:08,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:08,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:08,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:08,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:08,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:08,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:08,739 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:08,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:08,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:08,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:08,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:10,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:10,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:10,775 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-24 12:19:10,775 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:10,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:19:10,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:19:10,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:19:10,777 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 43 states. [2018-10-24 12:19:10,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:10,992 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-24 12:19:10,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:19:10,993 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-24 12:19:10,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:10,994 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:19:10,994 INFO L226 Difference]: Without dead ends: 136 [2018-10-24 12:19:10,995 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-24 12:19:10,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-24 12:19:10,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-24 12:19:10,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-24 12:19:10,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-24 12:19:10,999 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-24 12:19:10,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:10,999 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-24 12:19:10,999 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:19:10,999 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-24 12:19:11,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:19:11,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:11,000 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:11,001 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:11,001 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:11,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1878727773, now seen corresponding path program 41 times [2018-10-24 12:19:11,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:11,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:11,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:11,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:11,002 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:11,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:11,857 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:11,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:11,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:11,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:11,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:11,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:11,858 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:11,865 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:11,866 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:12,071 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-24 12:19:12,071 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:12,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:12,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:12,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:14,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:14,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:14,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-24 12:19:14,387 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:14,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:19:14,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:19:14,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:19:14,389 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 44 states. [2018-10-24 12:19:15,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:15,071 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-24 12:19:15,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:19:15,071 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-24 12:19:15,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:15,073 INFO L225 Difference]: With dead ends: 144 [2018-10-24 12:19:15,073 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:19:15,074 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:19:15,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:19:15,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-24 12:19:15,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-24 12:19:15,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-24 12:19:15,078 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-24 12:19:15,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:15,078 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-24 12:19:15,078 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:19:15,078 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-24 12:19:15,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-24 12:19:15,079 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:15,079 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:15,080 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:15,080 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:15,080 INFO L82 PathProgramCache]: Analyzing trace with hash -2107724711, now seen corresponding path program 42 times [2018-10-24 12:19:15,080 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:15,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:15,081 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:15,081 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:15,081 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:16,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:16,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:16,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:16,135 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:16,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:16,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:16,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:16,144 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:16,144 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:16,166 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:16,166 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:16,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:16,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:16,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:20,070 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:20,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:20,091 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-24 12:19:20,091 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:20,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:19:20,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:19:20,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:19:20,093 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 45 states. [2018-10-24 12:19:20,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:20,224 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-24 12:19:20,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:19:20,224 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 137 [2018-10-24 12:19:20,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:20,225 INFO L225 Difference]: With dead ends: 147 [2018-10-24 12:19:20,226 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:19:20,227 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:19:20,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:19:20,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-24 12:19:20,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-24 12:19:20,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-24 12:19:20,231 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-24 12:19:20,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:20,232 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-24 12:19:20,232 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:19:20,232 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-24 12:19:20,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-24 12:19:20,233 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:20,233 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:20,233 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:20,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:20,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1921993437, now seen corresponding path program 43 times [2018-10-24 12:19:20,234 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:20,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:20,234 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:20,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:20,235 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:20,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:21,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:21,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:21,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:21,461 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:21,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:21,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:21,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:21,471 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:21,471 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:21,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:21,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:21,520 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:21,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:23,928 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:23,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:23,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-24 12:19:23,950 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:23,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:19:23,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:19:23,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:19:23,951 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 46 states. [2018-10-24 12:19:24,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:24,102 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-24 12:19:24,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:19:24,102 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 140 [2018-10-24 12:19:24,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:24,104 INFO L225 Difference]: With dead ends: 150 [2018-10-24 12:19:24,104 INFO L226 Difference]: Without dead ends: 145 [2018-10-24 12:19:24,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-24 12:19:24,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-24 12:19:24,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-24 12:19:24,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-24 12:19:24,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-24 12:19:24,108 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-24 12:19:24,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:24,108 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-24 12:19:24,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:19:24,109 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-24 12:19:24,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-24 12:19:24,109 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:24,110 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:24,110 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:24,110 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:24,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1670517287, now seen corresponding path program 44 times [2018-10-24 12:19:24,110 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:24,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:24,111 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:24,111 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:24,111 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:24,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:25,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:25,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:25,603 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:25,603 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:25,603 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:25,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:25,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:25,612 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:25,612 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:25,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-24 12:19:25,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:25,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:25,680 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:25,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:27,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:27,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:27,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-24 12:19:27,885 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:27,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:19:27,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:19:27,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:19:27,886 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 47 states. [2018-10-24 12:19:28,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:28,019 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-24 12:19:28,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:19:28,020 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 143 [2018-10-24 12:19:28,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:28,021 INFO L225 Difference]: With dead ends: 153 [2018-10-24 12:19:28,021 INFO L226 Difference]: Without dead ends: 148 [2018-10-24 12:19:28,022 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:19:28,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-24 12:19:28,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-24 12:19:28,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-24 12:19:28,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-24 12:19:28,026 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-24 12:19:28,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:28,026 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-24 12:19:28,026 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:19:28,026 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-24 12:19:28,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-24 12:19:28,027 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:28,027 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:28,027 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:28,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:28,027 INFO L82 PathProgramCache]: Analyzing trace with hash 132553053, now seen corresponding path program 45 times [2018-10-24 12:19:28,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:28,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:28,028 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:28,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:28,028 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:28,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:29,268 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:29,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:29,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:29,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:29,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:29,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:29,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:29,280 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:29,281 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:29,306 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:29,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:29,309 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:29,331 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:29,331 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:31,635 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:31,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:31,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-24 12:19:31,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:31,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:19:31,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:19:31,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:19:31,660 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 48 states. [2018-10-24 12:19:31,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:31,897 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-24 12:19:31,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:19:31,898 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 146 [2018-10-24 12:19:31,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:31,899 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:19:31,899 INFO L226 Difference]: Without dead ends: 151 [2018-10-24 12:19:31,900 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:19:31,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-24 12:19:31,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-24 12:19:31,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-24 12:19:31,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-24 12:19:31,905 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-24 12:19:31,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:31,906 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-24 12:19:31,906 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:19:31,906 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-24 12:19:31,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-24 12:19:31,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:31,907 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:31,907 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:31,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:31,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1754919079, now seen corresponding path program 46 times [2018-10-24 12:19:31,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:31,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:31,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:31,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:31,910 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:31,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:32,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:32,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:32,915 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:32,915 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:32,915 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:32,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:32,915 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:32,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:32,925 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:32,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:32,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:32,973 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:32,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:35,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:35,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:35,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-24 12:19:35,729 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:35,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:19:35,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:19:35,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:19:35,730 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 49 states. [2018-10-24 12:19:35,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:35,900 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-24 12:19:35,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:19:35,901 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 149 [2018-10-24 12:19:35,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:35,902 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:19:35,902 INFO L226 Difference]: Without dead ends: 154 [2018-10-24 12:19:35,903 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-24 12:19:35,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-24 12:19:35,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-24 12:19:35,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-24 12:19:35,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-24 12:19:35,906 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-24 12:19:35,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:35,907 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-24 12:19:35,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:19:35,907 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-24 12:19:35,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-24 12:19:35,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:35,908 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:35,908 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:35,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:35,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1725364259, now seen corresponding path program 47 times [2018-10-24 12:19:35,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:35,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:35,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:35,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:35,909 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:35,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:36,889 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:36,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:36,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:36,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:36,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:36,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:36,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:36,897 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:36,897 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:36,950 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-24 12:19:36,951 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:36,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:36,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:36,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:39,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:39,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:39,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-24 12:19:39,730 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:39,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:19:39,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:19:39,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:19:39,731 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 50 states. [2018-10-24 12:19:39,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:39,906 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-24 12:19:39,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-24 12:19:39,906 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 152 [2018-10-24 12:19:39,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:39,907 INFO L225 Difference]: With dead ends: 162 [2018-10-24 12:19:39,908 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:19:39,909 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:19:39,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:19:39,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-24 12:19:39,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-24 12:19:39,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-24 12:19:39,913 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-24 12:19:39,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:39,913 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-24 12:19:39,913 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:19:39,913 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-24 12:19:39,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-24 12:19:39,914 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:39,914 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:39,914 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:39,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:39,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1726017319, now seen corresponding path program 48 times [2018-10-24 12:19:39,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:39,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:39,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:39,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:39,916 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:39,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:40,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:40,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:40,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:40,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:40,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:40,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:40,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:40,883 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:40,883 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:40,908 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:40,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:40,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:40,935 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:40,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:43,442 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:43,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:43,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-24 12:19:43,464 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:43,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:19:43,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:19:43,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:19:43,465 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 51 states. [2018-10-24 12:19:43,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:43,622 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-24 12:19:43,623 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:19:43,623 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 155 [2018-10-24 12:19:43,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:43,624 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:19:43,624 INFO L226 Difference]: Without dead ends: 160 [2018-10-24 12:19:43,624 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:19:43,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-24 12:19:43,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-24 12:19:43,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-24 12:19:43,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-24 12:19:43,627 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-24 12:19:43,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:43,627 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-24 12:19:43,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:19:43,627 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-24 12:19:43,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-24 12:19:43,628 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:43,628 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:43,628 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:43,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:43,629 INFO L82 PathProgramCache]: Analyzing trace with hash 293508701, now seen corresponding path program 49 times [2018-10-24 12:19:43,629 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:43,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:43,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:43,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:43,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:43,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:44,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:44,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:44,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:44,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:44,929 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:44,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:44,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:44,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:44,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:44,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:44,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:44,990 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:44,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:47,618 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:47,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:47,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-24 12:19:47,639 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:47,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:19:47,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:19:47,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:19:47,640 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 52 states. [2018-10-24 12:19:47,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:47,788 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-24 12:19:47,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:19:47,788 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 158 [2018-10-24 12:19:47,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:47,790 INFO L225 Difference]: With dead ends: 168 [2018-10-24 12:19:47,790 INFO L226 Difference]: Without dead ends: 163 [2018-10-24 12:19:47,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-24 12:19:47,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-24 12:19:47,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-24 12:19:47,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-24 12:19:47,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-24 12:19:47,795 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-24 12:19:47,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:47,795 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-24 12:19:47,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:19:47,795 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-24 12:19:47,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-24 12:19:47,796 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:47,796 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:47,796 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:47,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:47,797 INFO L82 PathProgramCache]: Analyzing trace with hash 91288153, now seen corresponding path program 50 times [2018-10-24 12:19:47,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:47,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:47,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:47,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:47,798 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:47,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:48,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:48,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:48,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:48,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:48,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:48,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:48,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:49,001 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:19:49,001 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:19:49,076 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-24 12:19:49,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:49,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:49,111 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:49,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:52,045 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:52,066 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:52,066 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-24 12:19:52,066 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:52,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:19:52,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:19:52,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:19:52,067 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 53 states. [2018-10-24 12:19:52,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:52,253 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-24 12:19:52,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:19:52,254 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 161 [2018-10-24 12:19:52,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:52,255 INFO L225 Difference]: With dead ends: 171 [2018-10-24 12:19:52,255 INFO L226 Difference]: Without dead ends: 166 [2018-10-24 12:19:52,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:19:52,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-24 12:19:52,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-24 12:19:52,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-24 12:19:52,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-24 12:19:52,258 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-24 12:19:52,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:52,258 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-24 12:19:52,259 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:19:52,259 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-24 12:19:52,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-24 12:19:52,259 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:52,259 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:52,260 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:52,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:52,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1578058973, now seen corresponding path program 51 times [2018-10-24 12:19:52,260 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:52,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:52,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:52,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:52,261 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:52,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:54,526 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:54,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:54,526 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:54,526 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:54,527 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:54,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:54,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:54,534 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:19:54,535 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:19:54,563 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:19:54,564 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:19:54,567 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:54,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:54,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:19:57,394 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:57,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:19:57,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-24 12:19:57,415 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:19:57,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-24 12:19:57,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-24 12:19:57,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:19:57,417 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 54 states. [2018-10-24 12:19:57,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:19:57,590 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-24 12:19:57,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-24 12:19:57,590 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 164 [2018-10-24 12:19:57,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:19:57,591 INFO L225 Difference]: With dead ends: 174 [2018-10-24 12:19:57,591 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:19:57,592 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:19:57,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:19:57,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-24 12:19:57,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-24 12:19:57,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-24 12:19:57,594 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-24 12:19:57,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:19:57,595 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-24 12:19:57,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-24 12:19:57,595 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-24 12:19:57,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-24 12:19:57,595 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:19:57,596 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:19:57,596 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:19:57,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:19:57,596 INFO L82 PathProgramCache]: Analyzing trace with hash -30166055, now seen corresponding path program 52 times [2018-10-24 12:19:57,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:19:57,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:57,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:19:57,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:19:57,597 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:19:57,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:59,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:59,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:59,421 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:19:59,421 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:19:59,421 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:19:59,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:19:59,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:19:59,430 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:19:59,430 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:19:59,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:19:59,460 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:19:59,495 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:19:59,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:02,472 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:02,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:02,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-24 12:20:02,493 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:02,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:20:02,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:20:02,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:20:02,495 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 55 states. [2018-10-24 12:20:02,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:02,679 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-24 12:20:02,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:20:02,680 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 167 [2018-10-24 12:20:02,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:02,680 INFO L225 Difference]: With dead ends: 177 [2018-10-24 12:20:02,680 INFO L226 Difference]: Without dead ends: 172 [2018-10-24 12:20:02,681 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-24 12:20:02,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-24 12:20:02,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-24 12:20:02,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-24 12:20:02,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-24 12:20:02,684 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-24 12:20:02,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:02,684 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-24 12:20:02,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:20:02,684 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-24 12:20:02,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-24 12:20:02,685 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:02,685 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:02,685 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:02,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:02,685 INFO L82 PathProgramCache]: Analyzing trace with hash -301788323, now seen corresponding path program 53 times [2018-10-24 12:20:02,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:02,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:02,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:02,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:02,686 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:02,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:03,943 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:03,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:03,943 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:03,943 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:03,943 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:03,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:03,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:03,952 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:20:03,952 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:20:04,006 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-24 12:20:04,007 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:04,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:04,036 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:04,036 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:07,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:07,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:07,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-24 12:20:07,203 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:07,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-24 12:20:07,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-24 12:20:07,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:20:07,205 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 56 states. [2018-10-24 12:20:07,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:07,362 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-24 12:20:07,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-24 12:20:07,362 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 170 [2018-10-24 12:20:07,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:07,363 INFO L225 Difference]: With dead ends: 180 [2018-10-24 12:20:07,364 INFO L226 Difference]: Without dead ends: 175 [2018-10-24 12:20:07,364 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:20:07,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-24 12:20:07,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-24 12:20:07,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-24 12:20:07,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-24 12:20:07,367 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-24 12:20:07,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:07,367 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-24 12:20:07,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-24 12:20:07,368 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-24 12:20:07,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-24 12:20:07,368 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:07,368 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:07,368 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:07,369 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:07,369 INFO L82 PathProgramCache]: Analyzing trace with hash -482388647, now seen corresponding path program 54 times [2018-10-24 12:20:07,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:07,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:07,369 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:07,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:07,370 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:07,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:09,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:09,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:09,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:09,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:09,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:09,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:09,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:09,360 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:20:09,360 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:20:09,399 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:20:09,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:09,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:09,442 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:09,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:12,822 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:12,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:12,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-24 12:20:12,844 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:12,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:20:12,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:20:12,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:20:12,846 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 57 states. [2018-10-24 12:20:13,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:13,043 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-24 12:20:13,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-24 12:20:13,044 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 173 [2018-10-24 12:20:13,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:13,044 INFO L225 Difference]: With dead ends: 183 [2018-10-24 12:20:13,045 INFO L226 Difference]: Without dead ends: 178 [2018-10-24 12:20:13,046 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:20:13,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-24 12:20:13,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-24 12:20:13,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-24 12:20:13,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-24 12:20:13,049 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-24 12:20:13,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:13,049 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-24 12:20:13,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:20:13,050 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-24 12:20:13,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:20:13,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:13,051 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:13,051 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:13,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:13,051 INFO L82 PathProgramCache]: Analyzing trace with hash 847380957, now seen corresponding path program 55 times [2018-10-24 12:20:13,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:13,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:13,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:13,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:13,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:13,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:14,268 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:14,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:14,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:14,269 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:14,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:14,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:14,269 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:14,277 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:14,277 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:14,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:14,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:14,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:14,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:17,650 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:17,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:17,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-24 12:20:17,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:17,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:20:17,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:20:17,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:20:17,675 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 58 states. [2018-10-24 12:20:17,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:17,900 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-24 12:20:17,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:20:17,900 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 176 [2018-10-24 12:20:17,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:17,901 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:20:17,901 INFO L226 Difference]: Without dead ends: 181 [2018-10-24 12:20:17,902 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:20:17,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-24 12:20:17,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-24 12:20:17,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-24 12:20:17,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-24 12:20:17,906 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-24 12:20:17,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:17,906 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-24 12:20:17,906 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:20:17,906 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-24 12:20:17,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-24 12:20:17,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:17,907 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:17,908 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:17,908 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:17,908 INFO L82 PathProgramCache]: Analyzing trace with hash -764684583, now seen corresponding path program 56 times [2018-10-24 12:20:17,908 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:17,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:17,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:17,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:17,909 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:17,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:19,205 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:19,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:19,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:19,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:19,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:19,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:19,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:19,215 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:20:19,215 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:20:19,272 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-24 12:20:19,273 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:19,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:19,306 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:19,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:22,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:22,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:22,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-24 12:20:22,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:22,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-24 12:20:22,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-24 12:20:22,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:20:22,697 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 59 states. [2018-10-24 12:20:22,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:22,922 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-24 12:20:22,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:20:22,923 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 179 [2018-10-24 12:20:22,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:22,924 INFO L225 Difference]: With dead ends: 189 [2018-10-24 12:20:22,924 INFO L226 Difference]: Without dead ends: 184 [2018-10-24 12:20:22,925 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:20:22,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-24 12:20:22,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-24 12:20:22,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-24 12:20:22,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-24 12:20:22,929 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-24 12:20:22,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:22,930 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-24 12:20:22,930 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-24 12:20:22,930 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-24 12:20:22,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-24 12:20:22,931 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:22,931 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:22,931 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:22,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:22,931 INFO L82 PathProgramCache]: Analyzing trace with hash 515117149, now seen corresponding path program 57 times [2018-10-24 12:20:22,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:22,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:22,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:22,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:22,932 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:22,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:24,252 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:24,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:24,252 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:24,252 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:24,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:24,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:24,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:24,270 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:20:24,270 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:20:24,303 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:20:24,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:24,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:24,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:24,347 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:27,903 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:27,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:27,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-24 12:20:27,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:27,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-24 12:20:27,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-24 12:20:27,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:20:27,926 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 60 states. [2018-10-24 12:20:28,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:28,144 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-24 12:20:28,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-24 12:20:28,145 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 182 [2018-10-24 12:20:28,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:28,146 INFO L225 Difference]: With dead ends: 192 [2018-10-24 12:20:28,146 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:20:28,147 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:20:28,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:20:28,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-24 12:20:28,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-24 12:20:28,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-24 12:20:28,150 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-24 12:20:28,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:28,150 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-24 12:20:28,151 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-24 12:20:28,151 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-24 12:20:28,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-24 12:20:28,152 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:28,152 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:28,152 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:28,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:28,152 INFO L82 PathProgramCache]: Analyzing trace with hash 663828569, now seen corresponding path program 58 times [2018-10-24 12:20:28,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:28,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:28,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:28,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:28,153 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:28,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:29,436 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:29,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:29,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:29,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:29,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:29,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:29,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:29,447 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:29,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:29,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:29,488 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:29,530 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:29,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:33,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:33,335 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:33,335 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-24 12:20:33,335 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:33,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:20:33,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:20:33,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:20:33,337 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 61 states. [2018-10-24 12:20:33,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:33,539 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-24 12:20:33,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:20:33,539 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 185 [2018-10-24 12:20:33,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:33,541 INFO L225 Difference]: With dead ends: 195 [2018-10-24 12:20:33,541 INFO L226 Difference]: Without dead ends: 190 [2018-10-24 12:20:33,542 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-24 12:20:33,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-24 12:20:33,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-24 12:20:33,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-24 12:20:33,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-24 12:20:33,546 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-24 12:20:33,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:33,546 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-24 12:20:33,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:20:33,546 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-24 12:20:33,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-24 12:20:33,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:33,547 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:33,548 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:33,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:33,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1480507683, now seen corresponding path program 59 times [2018-10-24 12:20:33,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:33,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:33,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:33,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:33,549 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:33,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:34,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:34,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:34,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:34,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:34,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:34,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:34,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:34,902 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:20:34,903 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:20:34,965 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-24 12:20:34,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:34,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:35,008 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:35,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:38,791 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:38,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:38,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-24 12:20:38,814 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:38,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-24 12:20:38,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-24 12:20:38,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:20:38,816 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 62 states. [2018-10-24 12:20:39,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:39,055 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-24 12:20:39,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-24 12:20:39,055 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 188 [2018-10-24 12:20:39,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:39,056 INFO L225 Difference]: With dead ends: 198 [2018-10-24 12:20:39,056 INFO L226 Difference]: Without dead ends: 193 [2018-10-24 12:20:39,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:20:39,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-24 12:20:39,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-24 12:20:39,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-24 12:20:39,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-24 12:20:39,061 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-24 12:20:39,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:39,061 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-24 12:20:39,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-24 12:20:39,061 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-24 12:20:39,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-24 12:20:39,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:39,062 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:39,062 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:39,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:39,062 INFO L82 PathProgramCache]: Analyzing trace with hash -58230311, now seen corresponding path program 60 times [2018-10-24 12:20:39,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:39,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:39,063 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:39,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:39,063 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:39,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:40,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:40,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:40,427 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:40,427 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:40,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:40,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:40,427 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:40,436 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:20:40,437 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:20:40,462 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:20:40,462 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:40,466 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:40,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:40,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:44,352 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:44,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:44,373 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-24 12:20:44,373 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:44,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:20:44,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:20:44,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:20:44,374 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 63 states. [2018-10-24 12:20:45,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:45,611 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-24 12:20:45,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:20:45,612 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 191 [2018-10-24 12:20:45,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:45,613 INFO L225 Difference]: With dead ends: 201 [2018-10-24 12:20:45,613 INFO L226 Difference]: Without dead ends: 196 [2018-10-24 12:20:45,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:20:45,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-24 12:20:45,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-24 12:20:45,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-24 12:20:45,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-24 12:20:45,620 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-24 12:20:45,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:45,620 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-24 12:20:45,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:20:45,620 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-24 12:20:45,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-24 12:20:45,621 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:45,622 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:45,622 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:45,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:45,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1154583901, now seen corresponding path program 61 times [2018-10-24 12:20:45,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:45,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:45,623 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:45,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:45,623 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:45,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:48,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:48,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:48,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:48,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:48,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:48,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:48,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:48,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:48,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:20:48,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:48,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:48,639 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:48,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:52,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:52,622 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-24 12:20:52,622 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:52,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-24 12:20:52,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-24 12:20:52,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-24 12:20:52,624 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 64 states. [2018-10-24 12:20:52,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:52,889 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-24 12:20:52,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-24 12:20:52,890 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 194 [2018-10-24 12:20:52,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:52,891 INFO L225 Difference]: With dead ends: 204 [2018-10-24 12:20:52,891 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:20:52,891 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-24 12:20:52,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:20:52,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-24 12:20:52,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-24 12:20:52,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-24 12:20:52,895 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-24 12:20:52,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:52,896 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-24 12:20:52,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-24 12:20:52,896 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-24 12:20:52,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-24 12:20:52,897 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:52,897 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:52,897 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:52,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:52,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1457087655, now seen corresponding path program 62 times [2018-10-24 12:20:52,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:52,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:52,898 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:20:52,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:52,899 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:52,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:20:54,330 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:54,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:54,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:20:54,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:20:54,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:20:54,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:20:54,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:20:54,340 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:20:54,341 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:20:54,405 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-24 12:20:54,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:20:54,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:20:54,439 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:54,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:20:58,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:20:58,547 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:20:58,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-24 12:20:58,547 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:20:58,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-24 12:20:58,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-24 12:20:58,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:20:58,549 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 65 states. [2018-10-24 12:20:58,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:20:58,821 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-24 12:20:58,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:20:58,821 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 197 [2018-10-24 12:20:58,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:20:58,822 INFO L225 Difference]: With dead ends: 207 [2018-10-24 12:20:58,822 INFO L226 Difference]: Without dead ends: 202 [2018-10-24 12:20:58,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:20:58,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-24 12:20:58,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-24 12:20:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-24 12:20:58,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-24 12:20:58,827 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-24 12:20:58,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:20:58,827 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-24 12:20:58,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-24 12:20:58,827 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-24 12:20:58,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-24 12:20:58,828 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:20:58,829 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:20:58,829 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:20:58,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:20:58,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1863121885, now seen corresponding path program 63 times [2018-10-24 12:20:58,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:20:58,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:58,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:20:58,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:20:58,830 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:20:58,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:00,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:00,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:00,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:00,438 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:00,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:00,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:00,438 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:00,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:21:00,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:21:00,477 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:21:00,477 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:00,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:00,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:00,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:05,911 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:05,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:05,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-24 12:21:05,931 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:05,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-24 12:21:05,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-24 12:21:05,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:21:05,932 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 66 states. [2018-10-24 12:21:06,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:06,219 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-24 12:21:06,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-24 12:21:06,219 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 200 [2018-10-24 12:21:06,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:06,220 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:21:06,220 INFO L226 Difference]: Without dead ends: 205 [2018-10-24 12:21:06,221 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:21:06,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-24 12:21:06,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-24 12:21:06,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-24 12:21:06,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-24 12:21:06,224 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-24 12:21:06,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:06,224 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-24 12:21:06,224 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-24 12:21:06,224 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-24 12:21:06,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-24 12:21:06,225 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:06,225 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:06,226 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:06,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:06,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1128701145, now seen corresponding path program 64 times [2018-10-24 12:21:06,226 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:06,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:06,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:21:06,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:06,227 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:06,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:07,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:07,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:07,744 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:07,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:07,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:07,744 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:07,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:07,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:21:07,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:07,786 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:07,822 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:07,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:12,124 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:12,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:12,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-24 12:21:12,146 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:12,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:21:12,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:21:12,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:21:12,148 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 67 states. [2018-10-24 12:21:12,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:12,356 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-24 12:21:12,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:21:12,357 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 203 [2018-10-24 12:21:12,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:12,358 INFO L225 Difference]: With dead ends: 213 [2018-10-24 12:21:12,358 INFO L226 Difference]: Without dead ends: 208 [2018-10-24 12:21:12,359 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-24 12:21:12,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-24 12:21:12,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-24 12:21:12,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-24 12:21:12,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-24 12:21:12,363 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-24 12:21:12,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:12,363 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-24 12:21:12,363 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:21:12,363 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-24 12:21:12,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-24 12:21:12,364 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:12,364 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:12,365 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:12,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:12,365 INFO L82 PathProgramCache]: Analyzing trace with hash 563841629, now seen corresponding path program 65 times [2018-10-24 12:21:12,365 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:12,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:12,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:12,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:12,366 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:12,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:13,917 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:13,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:13,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:13,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:13,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:13,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:13,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:13,925 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:21:13,925 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:21:13,990 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-24 12:21:13,990 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:13,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:14,029 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:14,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:18,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:18,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:18,483 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-24 12:21:18,483 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:18,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-24 12:21:18,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-24 12:21:18,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:21:18,484 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 68 states. [2018-10-24 12:21:18,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:18,686 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-24 12:21:18,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-24 12:21:18,687 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 206 [2018-10-24 12:21:18,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:18,688 INFO L225 Difference]: With dead ends: 216 [2018-10-24 12:21:18,688 INFO L226 Difference]: Without dead ends: 211 [2018-10-24 12:21:18,689 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:21:18,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-24 12:21:18,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-24 12:21:18,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-24 12:21:18,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-24 12:21:18,693 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-24 12:21:18,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:18,694 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-24 12:21:18,694 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-24 12:21:18,694 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-24 12:21:18,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-24 12:21:18,695 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:18,695 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:18,695 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:18,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:18,696 INFO L82 PathProgramCache]: Analyzing trace with hash 515866201, now seen corresponding path program 66 times [2018-10-24 12:21:18,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:18,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:18,696 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:21:18,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:18,697 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:18,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:20,490 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:20,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:20,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:20,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:20,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:20,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:20,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:20,499 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:21:20,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:21:20,529 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:21:20,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:20,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:20,569 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:20,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:25,160 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:25,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:25,180 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-24 12:21:25,181 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:25,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:21:25,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:21:25,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:21:25,182 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 69 states. [2018-10-24 12:21:25,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:25,608 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-24 12:21:25,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:21:25,608 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-10-24 12:21:25,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:25,609 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:21:25,609 INFO L226 Difference]: Without dead ends: 214 [2018-10-24 12:21:25,610 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-24 12:21:25,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-24 12:21:25,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-24 12:21:25,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-24 12:21:25,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-24 12:21:25,614 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-24 12:21:25,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:25,614 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-24 12:21:25,614 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:21:25,614 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-24 12:21:25,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-24 12:21:25,615 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:25,615 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:25,616 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:25,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:25,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1504000221, now seen corresponding path program 67 times [2018-10-24 12:21:25,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:25,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:25,617 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:21:25,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:25,617 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:25,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:27,263 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:27,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:27,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:27,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:27,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:27,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:27,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:27,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:27,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:21:27,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:27,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:27,355 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:27,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:32,098 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:32,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:32,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-24 12:21:32,118 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:32,118 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:21:32,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:21:32,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:21:32,119 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 70 states. [2018-10-24 12:21:32,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:32,413 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-24 12:21:32,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:21:32,414 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 212 [2018-10-24 12:21:32,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:32,415 INFO L225 Difference]: With dead ends: 222 [2018-10-24 12:21:32,415 INFO L226 Difference]: Without dead ends: 217 [2018-10-24 12:21:32,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-24 12:21:32,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-24 12:21:32,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-24 12:21:32,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-24 12:21:32,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-24 12:21:32,419 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-24 12:21:32,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:32,420 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-24 12:21:32,420 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:21:32,420 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-24 12:21:32,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-24 12:21:32,421 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:32,421 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:32,421 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:32,421 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:32,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1298743257, now seen corresponding path program 68 times [2018-10-24 12:21:32,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:32,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:32,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:32,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:32,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:32,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:34,152 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:34,152 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:34,152 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:34,152 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:34,153 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:34,153 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:34,153 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:34,159 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:21:34,160 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:21:34,226 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-24 12:21:34,226 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:34,229 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:34,281 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:34,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:39,088 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:39,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:39,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-24 12:21:39,109 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:39,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-24 12:21:39,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-24 12:21:39,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:21:39,111 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 71 states. [2018-10-24 12:21:39,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:39,354 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-24 12:21:39,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:21:39,355 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 215 [2018-10-24 12:21:39,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:39,356 INFO L225 Difference]: With dead ends: 225 [2018-10-24 12:21:39,356 INFO L226 Difference]: Without dead ends: 220 [2018-10-24 12:21:39,356 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:21:39,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-24 12:21:39,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-24 12:21:39,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-24 12:21:39,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-24 12:21:39,359 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-24 12:21:39,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:39,360 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-24 12:21:39,360 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-24 12:21:39,360 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-24 12:21:39,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-24 12:21:39,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:39,361 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:39,361 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:39,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:39,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1773009059, now seen corresponding path program 69 times [2018-10-24 12:21:39,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:39,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:39,362 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:21:39,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:39,362 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:39,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:41,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:41,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:41,112 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:41,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:41,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:41,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:41,120 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:21:41,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:21:41,155 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:21:41,155 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:41,157 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:41,198 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:41,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:46,184 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:46,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:46,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-24 12:21:46,204 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:46,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-24 12:21:46,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-24 12:21:46,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-10-24 12:21:46,206 INFO L87 Difference]: Start difference. First operand 219 states and 219 transitions. Second operand 72 states. [2018-10-24 12:21:46,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:46,431 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-24 12:21:46,432 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-24 12:21:46,432 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 218 [2018-10-24 12:21:46,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:46,433 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:21:46,434 INFO L226 Difference]: Without dead ends: 223 [2018-10-24 12:21:46,435 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-10-24 12:21:46,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-24 12:21:46,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-24 12:21:46,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-24 12:21:46,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 222 transitions. [2018-10-24 12:21:46,438 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 222 transitions. Word has length 218 [2018-10-24 12:21:46,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:46,438 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 222 transitions. [2018-10-24 12:21:46,438 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-24 12:21:46,438 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 222 transitions. [2018-10-24 12:21:46,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-24 12:21:46,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:46,439 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:46,439 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:46,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:46,439 INFO L82 PathProgramCache]: Analyzing trace with hash 521920857, now seen corresponding path program 70 times [2018-10-24 12:21:46,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:46,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:46,440 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:21:46,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:46,440 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:48,274 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:48,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:48,274 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:48,274 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:48,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:48,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:48,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:48,281 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:48,282 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:21:48,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:48,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:48,360 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:48,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:21:53,550 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:53,570 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:21:53,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 144 [2018-10-24 12:21:53,570 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:21:53,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-24 12:21:53,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-24 12:21:53,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10296, Invalid=10296, Unknown=0, NotChecked=0, Total=20592 [2018-10-24 12:21:53,572 INFO L87 Difference]: Start difference. First operand 222 states and 222 transitions. Second operand 73 states. [2018-10-24 12:21:53,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:21:53,804 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2018-10-24 12:21:53,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:21:53,805 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 221 [2018-10-24 12:21:53,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:21:53,806 INFO L225 Difference]: With dead ends: 231 [2018-10-24 12:21:53,806 INFO L226 Difference]: Without dead ends: 226 [2018-10-24 12:21:53,807 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=10296, Invalid=10296, Unknown=0, NotChecked=0, Total=20592 [2018-10-24 12:21:53,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-10-24 12:21:53,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2018-10-24 12:21:53,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-10-24 12:21:53,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 225 transitions. [2018-10-24 12:21:53,811 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 225 transitions. Word has length 221 [2018-10-24 12:21:53,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:21:53,812 INFO L481 AbstractCegarLoop]: Abstraction has 225 states and 225 transitions. [2018-10-24 12:21:53,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-24 12:21:53,812 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 225 transitions. [2018-10-24 12:21:53,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-24 12:21:53,813 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:21:53,813 INFO L375 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:21:53,813 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:21:53,813 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:21:53,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1489630685, now seen corresponding path program 71 times [2018-10-24 12:21:53,813 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:21:53,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:53,814 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:21:53,814 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:21:53,814 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:21:53,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:21:55,655 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:55,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:55,656 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:21:55,656 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:21:55,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:21:55,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:21:55,656 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:21:55,664 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:21:55,664 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:21:55,753 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2018-10-24 12:21:55,754 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:21:55,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:21:55,798 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:21:55,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-24 12:22:00,816 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-24 12:22:01,017 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:22:01,018 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:22:01,024 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:22:01,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:22:01 BoogieIcfgContainer [2018-10-24 12:22:01,024 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:22:01,025 INFO L168 Benchmark]: Toolchain (without parser) took 232641.64 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 618.7 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -168.8 MB). Peak memory consumption was 449.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:01,026 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:22:01,026 INFO L168 Benchmark]: CACSL2BoogieTranslator took 272.48 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:01,027 INFO L168 Benchmark]: Boogie Procedure Inliner took 16.98 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:22:01,027 INFO L168 Benchmark]: Boogie Preprocessor took 18.61 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:22:01,027 INFO L168 Benchmark]: RCFGBuilder took 322.05 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 753.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -796.1 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:01,028 INFO L168 Benchmark]: TraceAbstraction took 232007.59 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -134.7 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 616.7 MB). Peak memory consumption was 482.0 MB. Max. memory is 7.1 GB. [2018-10-24 12:22:01,031 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 272.48 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 16.98 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 18.61 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 322.05 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 753.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -796.1 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 232007.59 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -134.7 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 616.7 MB). Peak memory consumption was 482.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 225 with TraceHistMax 72,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 143 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 231.9s OverallTime, 73 OverallIterations, 72 TraceHistogramMax, 13.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 801 SDtfs, 2556 SDslu, 16900 SDs, 0 SdLazy, 7047 SolverSat, 109 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19080 GetRequests, 13969 SyntacticMatches, 0 SemanticMatches, 5111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 199.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=225occurred in iteration=72, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 72 MinimizatonAttempts, 71 StatesRemovedByMinimization, 71 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.4s SatisfiabilityAnalysisTime, 204.8s InterpolantComputationTime, 16471 NumberOfCodeBlocks, 16471 NumberOfCodeBlocksAsserted, 970 NumberOfCheckSat, 24484 ConstructedInterpolants, 0 QuantifiedInterpolants, 10474076 SizeOfPredicates, 70 NumberOfNonLiveVariables, 11550 ConjunctsInSsa, 2625 ConjunctsInUnsatCore, 212 InterpolantComputations, 2 PerfectInterpolantSequences, 0/529305 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown